taxonID	type	description	language	source
0391B015FFF3CE678ABB2162F2E6FADD.taxon	diagnosis	Diagnosis Head fused (suture present) with pereonite 1. Antenna 1 well developed; flagellum with more than 2 articles. Antenna 2 well developed; flagellum with 2 articles. Mandible well developed; molar presentı well developed; palp 3 - articulateı setal formula 1 – x – 1 or 1 – x – y – 1. Maxilliped well developed; inner plate (basal endite) smaller than outer plate (ischial endite); outer plate (ischial endite) well developed; palp article 3 without distal projection; palp article 4 well developed. Pereonite 4 clavate appendage absent. Pereonites 6 and 7 fused. Pereopod 3 vestigialı with 1 – 2 articles. Pereopod 4 vestigialı with 1 – 2 articles. Pereopod 5 well developedı with 7 articlesı with sparseı short setaeı with welldeveloped dactylus. Pereopods 6 and 7 well developedı with 7 articles. Gills on pereonites 3 and 4. Pleopods absent. Uropods with 1 or 2 pairs. Uropod 1 uniramous. Uropod 2 vestigial (unclear). Telson (dorsal lobe) present.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFF3CE678ABB2162F2E6FADD.taxon	type_taxon	Type species Protella Haswelliana Mayerı 1882 ı original designation. Included species Metaprotella includes 13 species: M. africana Mayerı 1903; M. excentrica Mayerı 1890; M. guileri sp. nov.; M. haswelliana (Mayerı 1882); M. hummelincki McCainı 1968; M. macoranicus Momtazi and Sariı 2013; M. makrodactylos Stebbingı 1910; M. mauritiensis Guerra- Garcíaı 2003; M. problematica Mayerı 1890; M. sandalensis Mayerı 1898; M. solitaria sp. nov.; M. tanzaniensis Guerra-Garcíaı 2002; M. unguja Larsenı 1997.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFF3CE678ABB2162F2E6FADD.taxon	discussion	Remarks The generic diagnosis of the genus Metaprotella is specified in Takeuchi and Lowry (2007 a) and Lim et al. (2012).	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFF3CE6E8A9225B3F788FDCF.taxon	description	(Figures 1 – 4)	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFF3CE6E8A9225B3F788FDCF.taxon	materials_examined	Type material Holotypeı maleı AM P. 48733 ı 33 ° 51 ʹ 51 ʺ S 151 ° 14 ʹ 28 ʺ Eı north-east corner of Clark Islandı Port Jacksonı New South Walesı red algae covered with thick sedimentı 7 m depthı 17 April 1996 ı coll. I. Takeuchi. Paratypesı 3 malesı 2 juvenilesı AM P. 48734 ı 33 ° 51 ʹ 51 ʺ S 151 ° 14 ʹ 28 ʺ Eı north-east corner of Clark Islandı Port Jacksonı New South Walesı red algae covered with thick sedimentı 7 m depthı 17 April 1996 ı coll. I. Takeuchi. Additional material examined 1 maleı AM G. 931 ı 35 ° 03 ʹ S 150 ° 44 ʹ Eı Jervis Bayı New South Walesı coll. T. Whitelegge; 1 maleı AM G. 2561 ı 33 ° 51 ʹ S 151 ° 16 ʹ Eı Port Jacksonı New South Wales; 3 malesı AM G. 2567 ı 33 ° 51 ʹ S 151 ° 16 ʹ Eı Port Jacksonı New South Wales; 3 malesı 1 mature femaleı AM P. 3348 ı 33 ° 51 ʹ S 151 ° 16 ʹ Eı Port Jacksonı New South Wales; 2 mature femalesı AM P. 24315 ı 33 ° 49 ʹ S 151 ° 20 ʹ Eı east of North Headı Sydneyı New South Walesı Australian Museum Shelf Benthic Surveyı 20 February 1973; 4 mature femalesı AM P. 47733 ı 33 ° 51 ʹ S 151 ° 16 ʹ Eı Port Jacksonı New South Wales; 1 maleı AM P. 68551 ı 35 ° 31 ʹ 39 ʺ S 150 ° 24 ʹ 58 ʺ Eı north-west side of Brush Islandı north of Batemans Bayı New South Walesı hand collected on SCUBA alga Padina sp. ı 14 m depthı 9 February 2003 ı coll. P. B. Berentsı J. Euı A. J. Milları G. D. F. Wilsonı Hermon Slade Batemans Bay Expedition; 3 malesı 1 juvenile AM P. 72649 ı north-west side of Brush Islandı north of Batemans Bayı New South Walesı 35 ° 31 ʹ 39 ʺ S 150 ° 24 ʹ 58 ʺ Eı 9 February 2003 ı hand collected on SCUBA Sargassum sp. (alga) scattered low reefsı rocks and sandı 18.1 m depthı coll. P. B. Berentsı J. Eu. A. J. Milları G. D. F. Wilsonı Hermon Slade Batemans Bay Expedition; 2 malesı 2 juvenilesı AM P. 98926 ı 35 ° 44 ʹ 55 ʺ S 150 ° 15 ʹ 27 ʺ Eı west side of North Tollgate Islandı Batemans Bayı New South Walesı 11 February 2002 ı hand collected on SCUBA alga Chondria succulenta ı 9 m depthı coll. P. B. Berentsı J. Euı A. J. Milları G. D. F. Wilsonı RV Baragulaı Hermon Slade Batemans Bay Expedition; 1 maleı AM P. 98928 ı 35 ° 44 ʹ 47 ʺ S 150 ° 15 ʹ 28 ʺ Eı north-west side of Tollgate Islandsı Batemans Bayı New South Walesı 28 October 2002 ı Aquatic hand collected on SCUBA macroalga Sporochnus radiciformis ı 12 m depthı coll. D. F. Wilsonı N. Yeeı P. B. Berentsı RV Connemaraı Hermon Slade Batemans Bay Expedition; 1 premature femaleı 2 juvenileı AM P. 98929 ı 35 ° 44 ʹ 47 ʺ S 150 ° 15 ʹ 28 ʺ Eı north-west side of Tollgate Islandsı Batemans Bayı New South Walesı 28 October 2002 ı Aquatic hand collected on SCUBA macroalga Sporochnus radiciformis ı 12 m depthı coll. D. F. Wilsonı N. Yeeı P. B. Berentsı RV Connemaraı Hermon Slade Batemans Bay Expedition; 1 mature femaleı AM P. 98970 ı 33 ° 51 ʹ S 151 ° 16 ʹ Eı Port Jacksonı New South Wales. Type locality Clark Islandı Port Jacksonı New South Walesı Australia. Other localities East of North Headı Sydneyı Jervis Bayı Brush Islandı and Batemans Bayı New South Walesı Australia.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFF3CE6E8A9225B3F788FDCF.taxon	description	Description Holotype, male ı body length 8.82 mmı AM P. 48733. Head 0.49 mm; pereonite 1 ı 0.18 mm; pereonite 2 ı 1.22 mm; pereonite 3 ı 2.07 mm; pereonite 4 ı 2.34 mm; pereonite 5 ı 2.00 mm; pereonites 6 and 7 combinedı 0.53 mm. Head / pereonite 1 fused (suture present) with paired small triangular dorsal projections; eye largeı distinctive. Antenna 1 slenderı 0.70 × body length; peduncle article 2 longest; peduncular article 3 straight; flagellum 0.70 × peduncular lengthı with 14 articlesı proximal article composed of 4 articles. Antenna 2 slender; 0.5 × antenna 1 length; peduncle setose; flagellum 0.25 × of peduncular lengthı with 2 articles. Upper lip notchedı forming rounded quadrilateral projections. Mandible right incisor with 5 teeth; lacinia mobilis with 3 teethı with 2 bundled setal rows; palp 3 - articulateı palp article 3 setal formula 1 – 19 – 1 – 1; molar well developed with flake; left incisor with 5 teeth; lacinia mobilis with 5 teethı 3 bundled setal rows; palp 3 - articulate; palp article 3 setal formula 1 – 12 – 1 – 1; molar well developed. Lower lip finely setose on inner and outer lobes. Maxilla 1 outer plate with 7 stout apical setal-teeth; palp distal margin with 1 robust setaı 3 triangular projectionsı each with a slender or robust setaı 1 triangular projection without setaı and a row of 4 slender setae. Maxilla 2 inner plate trianguları with 8 setae; outer plate elongateı with 12 apical setae. Maxilliped basal endite (inner plate) subtrianguları with 2 small nodular setaeı with 4 setae near distal margin; ischial endite (outer plate) ovalı 2 × length of inner plateı inner margin blade-likeı with many fine setaeı with 1 seta on inner margin; palp article 2 setose on inner margin; palp article 3 expandedı with moderately dense distal setae; palp article 4 (dactylus) weakly falcate. Pereon. Pereonite 2 with anterolateral bifurcated projectionı with small midlateral projectionı with paired anteriorly curved mid-dorsal projectionsı with simple dorsodistal projection. Pereonite 3 with subacute anterolateral projectionı with paired mid-dorsal projectionsı with simple dorsodistal projection. Pereonite 4 with small anterolateral projection. Pereonite 5 with small anterolateral projection. Pereonites 6 and 7 not articulated obliquely. Gnathopod 1 merus and propodus setose; propodus subtrianguları propodus with 5 – 6 rows of submarginal setae on distal part (near anterior margin) ı palm begins 1 / 6 along posterior marginı minutely serrateı with 1 robust seta near corner of palmı dactylus slightly curved. Gnathopod 2 begins 1 / 5 (0.20) along anterior margin of corresponding pereonite; coxa vestigial; basis 0.6 × length of pereonite 2 ı with small projection near distal margin; ischium with small distal projection; carpus 0.16 × propodus length; propodus subovateı largeı length 2 × widthı anterodistal margin slightly concave; palm proximal projection with 1 robust (grasping) setaı palm margin convexı smoothı with broad well-developed distal shelfı with two triangular projections distallyı with deepı narrow sinusı with midpalmar projection. Gill 3 length about 1 / 4 of corresponding pereoniteı straight. Pereopod 3 with 1 articleı length 3 × widthı with 4 distal and 1 lateral setae. Gill 4 length about 1 / 6 of corresponding pereoniteı curved anteriorly. Pereopod 4 with 1 articleı length 2 × widthı with 5 distal and 2 lateral setae. Pereopod 5 slender; basis shorter than propodus; carpus with 5 setae on anterior margin; propodus with 1 pair of robust setae from 2 / 5 on anterior marginı with 2 robust and 2 short setae along palm; dactylus curvedı not setose. Pereopod 6 more robust than pereopod 5. Pereopod 7 more robust than pereopod 6. Pleon. Uropod 1 probably bi-articulate (suture unclear); peduncleı length about 2.5 × widthı with 6 – 8 lateral setae; ramus length about 0.3 × peduncular lengthı with 10 shorter setae. Telson (dorsal lobe) present. Male, Body lengthı 15.47 mmı AM P. 98928. Head 0.81 mm; pereonite 1 ı 0.37 mm; pereonite 2 ı 2.33 mm; pereonite 3 ı 3.63 mm; pereonite 4 ı 4.09 mm; pereonite 5 ı 3.28 mm; pereonites 6 and 7 combinedı 0.96 mm. Head and pereonites slender. Head with paired small triangular dorsal projections; eye largeı distinctive. Antenna 1 slenderı 0.7 × body length; peduncle article 2 longest; peduncular article 3 straight; flagellum 0.45 × peduncular lengthı with 15 articlesı proximal article composed of 5 articles. Pereonite 2 with anterolateral bifurcated projectionı with 2 small midlateral projectionsı with paired anteriorly curved mid-dorsal projectionsı with round dorsodistal projection. Pereonite 3 with subacute anterolateral projectionı with round posterolateral projectionı with paired mid-dorsal projectionsı with round dorsodistal projection. Pereonite 4 with subacute anterolateral projectionı with small dorsolateral projection. Pereonite 5 with subacute anterolateral projection. Pereonites 6 and 7 not articulated obliquely. Gnathopod 2 begins 1 / 5 (0.20) along anterior margin of corresponding pereonite; coxa vestigial; basis about 0.8 × length of pereonite 2 ı with distinct basal projectionı with triangular and round distal projections; propodus subovate.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFF3CE6E8A9225B3F788FDCF.taxon	etymology	Etymology This species is named after Eric Guilerı marine biologist who studied caprellids in the 1950 s at the University of Tasmania.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFF3CE6E8A9225B3F788FDCF.taxon	discussion	Remarks The genus Metaprotella is one of the most dominant and widely distributed genera of the Caprellidae in the tropical region. Prior to the present studyı eleven species have been described from around the world (see McCain and Steinberg 1970; Larsen 1997; Guerra-García 2002 ı 2003; Lim and Takeuchi 2012; Momtazi and Sari 2013). The present species was previously reported as Metaprotella excentrica Mayerı 1890 [sense lato] based on the specimens collected from Port Jacksonı New South Wales (see Mayer 1903 ı Stebbing 1910 ı McCain and Steinberg 1970. The type locality of M. excentrica was the Pamban Bridgeı Indiaı which is situated north of the Mannar between south-eastern India and northern Sri Lanka. Metaprotella excentrica [sensu lato] was also recorded from Ceylon (Sri Lanka) and Port Jacksonı New South Wales (see McCain and Steinberg 1970; Hutchings et al. 2013). Mayer (1890) first described this species based on the specimens from the type locality. Later Sivaprakasam (1977) described and figured a large male collected from Kilakkarai or Appa Island which is located on the Indian coast of the Gulf of Mannar. Guerra-García et al. (2010) also figured a mature male and female collected from Kasivari Island in the same Gulf of Mannar. All these figures for M. excentrica from India confirm the unique diagnosis for gnathopod 2 ı which is the presence of three distal projections on the basis. Descriptions and / or figures of M. excentrica [sensu lato] from New South Wales have never been reported. Metaprotella guileri sp. nov. from New South Wales differs from M. excentrica [sensu stricto] from India by: (1) the head possessing a pair of small triangular projectionsı M. excentrica [sensu stricto] projections of head are smallı but sharp; (2) pereonites 2 and 3 having anteriorly forwarded mid-dorsal triangular projectionsı while those projections of M. excentrica [sensu stricto] are sharp; (3) pereonite 2 lacking a pair of posterior dorsal projection which M. excentrica possesses; and (4) the basis of gnathopod 2 with one to two distal projectionsı while M. excentrica [sensu stricto] has three distal projections. Thusı we establish the new speciesı Metaprotella guileri. Considering the biogeographical distributionı previous records of M. excentrica [sensu lato] recorded from Port Jacksonı New South Wales (see McCain and Steinberg 1970; Hutchings et al. 2013) could be M. guileri sp. nov. The specimens assigned as Metaprotella guileri sp. nov. were found in the old collection of the Australian Museum collected in Port Jackson and Jervis Bay and in materials collected in Port Jackson in 1996 and from Brush Island to Batemans Bay in the Hermon Slade Batemans Bay Expedition during 2003 to 2004. The male of materials collected in 1996 from Port Jackson (by ITı the senior author) ı where most of the old specimens were collectedı was selected as the holotypeı and the concurrently collected specimens were assigned as paratypes. While three mature females of the present species were found in the old collectionı these are not suitable for description and illustration due to being dried up or damaged. The largest male collected in the Hermon Slade Batemans Bay Expedition was also figured and described. The present species shows an unique ontogenetic development of gnathopod 2 in larger males. Of the specimens studiedı 4 males longer than 12.80 mm in body length possess the distinct proximal projection and two distal round projections on the basis of gnathopod 2.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFFACE6E8AD622A1F722FAFC.taxon	materials_examined	Type locality Emu Pointı Albanyı Western Australiaı Australia. Other localities Port Jacksonı New South Wales and Port Phillip Bayı Victoriaı Australia.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFFACE6E8AD622A1F722FAFC.taxon	discussion	Remarks While Metaprotella haswelliana Mayerı 1882 was recorded from Port Jackson in the 1880 s (see Mayer 1882; Haswell 1885) ı no specimens could be found during intensive field surveys from Jervis Bay and adjacent areas to the Solitary Islands along the coast of New South Wales that were conducted during the 1995 / 96 austral summer. There were also none found from the extensive crustacean collections of the Australian Museum (Springthorpe and Lowry 1994; Takeuchi and Lowry 2007 a). Thusı Metaprotella haswelliana was listed as a ‘ Species Presumed Extinct ’ in New South Wales under the Part 7 A of the NSW Fisheries Management Act 1994 (Fisheries Scientific Committee 2008).	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFFACE6B8AAF2590F081FADB.taxon	description	(Figures 5 – 7)	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFFACE6B8AAF2590F081FADB.taxon	materials_examined	Type material Holotypeı maleı 7.55 mmı AM P. 101914 ı 30 ° 12 ʹ 19 ʺ S 153 ° 15 ʹ 55 ʺ Eı coral zone on rocksı South Solitary Islandı Solitary Islandsı New South Walesı brown algaeı 8 m depthı 5 February 1996 ı coll. I. Takeuchi. Paratypesı 1 maleı AM P. 48618 ı 30 ° 12 ʹ 19 ʺ S 153 ° 15 ʹ 55 ʺ Eı coral zone on rocksı South Solitary Islandı Solitary Islandsı New South Walesı brown algaı 12 m depthı 5 February 1996 ı coll. I. Takeuchi; 3 malesı AM P. 48621 ı 30 ° 12 ʹ 19 ʺ S 153 ° 15 ʹ 55 ʺ Eı coral zone on rocksı South Solitary Islandı Solitary Islandsı New South Walesı brown algaeı 8 m depthı 5 February 1996 ı coll. I. Takeuchi; 1 maleı AM P. 48638 ı 29 ° 55 ʹ 30 ʺ S 153 ° 23 ʹ 14 ʺ Eı ‘ The Canyons ’ ı off North Solitary Islandı Solitary Islandsı New South Walesı brown algaı Lorophora variegata on top of rocksı 7 m depthı 8 February 1996 ı coll. I. Takeuchi; 1 premature femaleı AM P. 48657 ı 29 ° 55 ʹ 30 ʺ S 153 ° 23 ʹ 14 ʺ Eı ‘ The Canyons ’ ı off North Solitary Islandı New South Walesı hydroids on top of rocksı 6 m depthı 8 February 1996 ı coll. I. Takeuchi; 1 mature femaleı AM P. 48658 ı 29 ° 55 ʹ 30 ʺ S 153 ° 23 ʹ 14 ʺ Eı ‘ The Canyons ’ ı off North Solitary Islandı Solitary Islandsı New South Walesı hydroids on top of rocksı 6 m depthı 8 February 1996 ı coll. I. Takeuchi; 1 maleı 1 mature femaleı 1 juvenileı AM P. 48659 ı 29 ° 55 ʹ 30 ʺ S 153 ° 23 ʹ 14 ʺ Eı ‘ The Canyons ’ ı off North Solitary Islandı Solitary Islandsı New South Walesı hydroids on top of rocksı 6 m depthı 8 February 1996 ı coll. I. Takeuchi. Additional material examined One maleı 2 mature and 3 immature femalesı 4 juvenilesı AM P. 47829 ı 33 ° 49 ʹ S 151 ° 20 ʹ Eı east of North Headı Port Jacksonı New South Walesı 21.3 m depthı Australian Museum Shelf Benthic Surveyı 20 February 1970. Type locality Solitary Islandsı New South Walesı Australia. Other locality East of North Headı Port Jacksonı New South Walesı Australia.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFFACE6B8AAF2590F081FADB.taxon	description	Description Holotype, male ı body length 7.55 mmı AM P. 101914. Head 0.48 mm; pereonite 1 ı 0.20 mm; pereonite 2 ı 1.30 mm; pereonite 3 ı 1.74 mm; pereonite 4 ı 1.74 mm; pereonite 5 ı 1.53 mm. Pereonites 6 – 7 completely fusedı 0.57 mm. Head / pereonite 1 fused (suture present) with paired dorsal projectionsı eyes largeı distinctive. Antenna 1 slenderı 0.65 × body length; peduncle article 2 longest; flagellum 0.6 × peduncular lengthı with 12 articlesı proximal article composed of 3 fused articles. Antenna 2 ı 0.6 × antenna 1 length; flagellum about 1 / 5 (0.2 ×) of peduncular length. Upper lip notchedı forming rounded quadrilateral projections. Mandible right incisor with 5 teeth; lacinia mobilis presentı with 2 bundled setal rows; palp 3 - articulateı palp article 2 with 8 lateral setae; palp article 3 setal formula 1 – 9 – 1; molar well developed with flake; left incisor with 5 teeth; lacinia mobilis with 5 teethı with 3 bundled setal rows; palp 3 - articulateı palp article 2 with 10 lateral setae; palp article 3 setal formula 1 – 8 – 1. Lower lip finely setose on inner and outer lobes. Maxilla 1 outer plate with 7 stout apical setal-teeth; palp distal margin with 1 robust seta and 5 triangular projectionsı each with a slender or robust setaı with a row of 4 slender setae. Maxilla 2 inner plate with about 8 apical robust setae; outer plate elongated with 14 apical setae. Maxilliped basal endite (inner plate) with 1 small nodular setaı with 4 setae near distal margin; ischial endite (outer plate) 2 × length of basal endite (inner plate) ı inner margin minutely serrateı with many fine setaeı with 2 setae on inner marginı with 1 seta on outer margin; palp article 2 setose on inner margin; palp article 3 with distal projectionı with moderately dense distal setae; palp article 4 (dactylus) weakly falcate. Pereon. Pereonite 2 with anterolateral triangular projectionı with midlateral projectionı with paired anteriorly curved mid-dorsal projections. Pereonite 3 with rounded anterolateral projectionı with paired mid-dorsal projectionsı with triangular posterodorsal projection. Pereonite 4 with anterolateral projection with slight broad mid-dorsal hump. Pereonite 5 with tiny anterolateral projection. Gnathopod 1 carpus and propodus setose; propodus subtrianguları with 3 – 4 rows of submarginal setae near anterior marginı propodus palm begins less than 0.25 along posterior margin of propodusı propodus palm minutely serrateı propodus with 1 robust seta near corner of palm; dactylus slightly curved. Gnathopod 2 begins 1 / 5 (0.20) along anterior margin of corresponding pereonite; coxa vestigial; basisı 0.75 × length of pereonite 2 ı with anterodistal projection; ischium with distal projection; carpus 0.6 × propodus length; propodus largeı elongate (subrectangular) ı length 2 × widthı propodus anterodistal margin straightı propodus with small anterodistal rounded projection; palm proximal projection with 1 robust (grasping) setaı palm margin convexı minutely serrateı with midpalmar projectionı with deepı narrow sinusı with broadı well-developed distal shelfı shelf with two triangular projections distally. Gill 3 ovateı 0.35 × corresponding pereoniteı straight. Pereopod 3 with 1 articleı length 5 × widthı with 8 distal setae. Gill 4 ovateı 0.3 × corresponding pereoniteı straight. Pereopod 4 with 1 articleı length 5.5 × widthı with 7 distal setae. Pereopod 5 slender; basis shorter than propodus; carpus with ca. 10 setae on anterior to distal margin; propodus with 1 pair of robust setae from 1 / 3 on anterior marginı with 2 robust and 1 short setae along palm; dactylus curvedı not setose. Pereopod 6 more robust than pereopod 5; propodus more setose than pereopod 5. Pereopod 7 similar to pereopod 6; propodus more setose than pereopod 6. Pleon. Pleopods absent. Uropod 1 probably bi-articulate (suture unclear); peduncleı length about 0.8 × widthı with 1 – 2 lateral setae; ramus length 0.5 × widthı with about 10 short distal setae. Telson present. Paratype, mature female (sexually dimorphic characters) ı body length 4.73 mm. AM P. 48658. Head 0.33 mm; pereonite 1 ı 0.10 mm; pereonite 2 ı 0.90 mm; pereonite 3 ı 1.09 mm; pereonite 4 ı 0.91 mm; pereonite 5 ı 0.99 mm; pereonites 6 and 7 combined 0.41 mm. Pereonite 4 with rounded anterolateral projectionı with paired small mid-dorsal projections. Gnathopod 2 begins 0.15 along anterior margin of corresponding pereonite; propodus elongateı length 2.3 × widthı propodus palm with poorly developed triangular projectionı with poorly developed distal shelf.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFFACE6B8AAF2590F081FADB.taxon	etymology	Etymology Named for the type localityı Solitary Islands.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFFACE6B8AAF2590F081FADB.taxon	discussion	Remarks Metaprotella solitaria sp. nov. is close to M. guileri sp. nov. and M. haswelliana (Mayerı 1882). Metaprotella solitaria sp. nov. differs from M. guileri sp. nov. by the following diagnostic characters: (1) M. solitaria sp. nov. possesses distinct mid-dorsal and posterodorsal projections on pereonites 2 and 3 in malesı while M. guileri sp. nov. has small projections on these pereonites; and (2) in M. solitaria sp. nov. the gills are ovateı while those in M. guileri sp. nov. are elongated. Comparison of the observations between M. solitari a sp. nov. and the specimens of M. haswelliana from Western Australia (see Takeuchi and Lowry 2007 a) confirmed the following differences of diagnostic characters: (1) in M. solitaria sp. nov. the posterodorsal projection on pereonite 2 is slightly turnedı while in M. haswelliana it is anteriorly hooked; (2) in M. solitaria sp. nov. the posterodorsal projection on pereonite 3 is smallı while in M. haswelliana it is anteriorly hooked; (3) in M. solitaria sp. nov. gnathopod 2 lacks a triangular projection near the apical end of the dorsal surfaceı while in M. haswelliana it is present; and (4) gills are oval in M. solitaria sp. nov. ı while they are twisted in M. haswelliana.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFFFCE768AA825B2F055FEDD.taxon	diagnosis	Diagnosis Head fused (suture present) with pereonite 1. Antenna 1 well developed; flagellum with more than 2 articles. Antenna 2 well developed; flagellum with 2 articles. Mandible well developed; molar presentı well developed; palp 3 - articulateı setal formula 1 – x – 1 or 1 – x – y – 1. Maxilliped well developed; inner plate (basal endite) smaller than outer plate (ischial endite); outer plate (ischial endite) well developed; palp article 3 without distal projection; palp article 4 well developed. Pereonite 4 clavate appendage absent. Pereonites 6 and 7 dorsal suture oblique or separated. Pereopod 3 vestigialı with 1 – 2 articles. Pereopod 4 vestigialı with 1 – 2 articles. Pereopod 5 well developedı with 7 articlesı with sparseı short setaeı with well-developed dactylus. Pereopods 6 and 7 well developedı with 7 articles. Gills on pereonites 3 and 4. Pleopods absent. Uropods 2 pairs. Uropod 1 uniramous. Uropod 2 vestigial (unclear). Telson (dorsal lobe) present.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFFFCE768AA825B2F055FEDD.taxon	type_taxon	Type species Notoprotella cornuta sp. nov. by present designation. Included species Notoprotella includes 7 species: N. berentsae (Takeuchi and Lowryı 2007 b); N. cornuta sp. nov.; N. gordoni (Guilerı 1954); N. pearce (Guerra-Garcíaı 2006); N. tasmaniensis (Guilerı 1954); N. tuberculata (Guerra-García and Takeuchiı 2004); N. sp. from New South Wales (present study).	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFFFCE768AA825B2F055FEDD.taxon	etymology	Etymology A compound word is derived from noto meaning ‘ south ’ ı and Protella. Genderı feminine.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFFFCE768AA825B2F055FEDD.taxon	discussion	Remarks Notoprotella gen. nov. most closely resembles the genera Protella Danaı 1852 and Orthoprotella Mayerı 1903 (Table 1). Recentlyı Takeuchi et al. (2014) redescribed the old type material of Protella gracilis Danaı 1853 deposited in the Museum of Comparative Zoologyı Harvard Universityı collected from the Balabac Straitı the Philippines. Protella gracilis is the type species of Protella which is one of the fundamental genera established during the nineteenth century in the Caprellidae. They found that Protella possesses a unique diagnosis: the presence of a knob-like appendage on uropod 1. Notoprotella gen. nov. differs from Protella in lacking this knob-like appendage (Table 1). The generic diagnosis of Orthoprotella is refined based on the redescription of Orthoprotella australis (Haswellı 1879) ı type species of Orthoprotella ı in this study (see remarks of Orthoprotella Mayerı 1903 and Orthoprotella australis (Haswellı 1879 )). Notoprotella gen. nov. differs from Orthoprotella by the following generic diagnosis in males: in Notoprotella gen. nov. the third article of the maxilliped palp is without distal projectionı which is present in Orthoprotella (see remarks of Orthoprotella) (Table 1). The description and figures for Orthoprotella berentsae Takeuchi and Lowryı 2007 b (see Takeuchi and Lowry 2007 b) ı O. gordoni Guilerı 1954 (see Figures 11 ı 12) ı O. pearce Guerra-Garcíaı 2006 (see Guerra-García 2006) ı O. tasmaniensis Guilerı 1954 (see Guerra- García and Takeuchi 2004) and O. tuberculata Guerra-García and Takeuchiı 2004 (see Guerra-García and Takeuchi 2004) agree well with the above generic diagnosis of Notoprotella gen. nov. Thusı these five speciesı including O. berentsae and O. gordoni ı are moved to Notoprotella. All seven species of Notoprotella gen. nov. are recorded as distributed from Tasmania to the Queensland coast of eastern Australia. Thusı the distribution of Notoprotella overlaps in the south with that of Protella and Orthoprotella. Four species have been so far described in the genus Protella: P. amamiensis Takeuchi et al. 2014 ı P. gracilis Danaı 1853 ı P. similis Mayerı 1903 and P. trilobata McCain and Grayı 1971. While P. trilobata was recorded from south of Falkland Islands in Sub-Antarcticaı the other three species including the type species (P. gracilis) are distributed from south of Japan to Indonesia. Seven species have been so far recorded in Orthoprotella (see remarks of Orthoprotella). Species of Orthoprotella are distributed mainly from south of Japan to Western Australia and Tasmania in the Indo-Pacific and in South Africa (O. mayeri K. H. Barnard 1916) and Brazil (O. melloi Quiteteı 1975).	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFE2CE768A2421B2F182FB0B.taxon	materials_examined	Type locality Port Stephensı New South Walesı Australia. Other localities Broken Bayı Port Jackson and Twofold Bayı New South Wales. Australia.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFE2CE768A2421B2F182FB0B.taxon	discussion	Remarks Orthoprotella mayeri K. H. Barnard 1916 [sensu lato] has been recorded from South Africaı Sydneyı New South Wales and Singapore (see McCain and Steinberg 1970). The close comparison of New South Wales specimens deposited at the Australian Museum with South African specimensı including holotypeı deposited at the South African Museum revealed that New South Wales specimens are a distinct species from the latterı known as Orthoprotella berentsae Takeuchi and Lowryı 2007 b (Takeuchi and Lowry 2007 b). The description of maxilliped and pereonites 6 to 7 of O. berentsae agrees well with the generic diagnosis of Notoprotella gen. nov.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFE2CE738AAB249DF0F2FA86.taxon	description	(Figures 8 – 10)	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFE2CE738AAB249DF0F2FA86.taxon	materials_examined	Type material Holotypeı maleı AM P. 101913 ı South Solitary Islandı Solitary Islandsı New South Walesı 30 ° 12 ʹ 19 ʺ S 153 ° 15 ʹ 55 ʺ Eı hydroids on coralı 20 m depthı 5 February 1996 ı coll. I. Takeuchi. Paratypesı 1 maleı 2 mature femalesı AM P. 48614 ı South Solitary Islandı Solitary Islandsı New South Walesı 30 ° 12 ʹ 19 ʺ S 153 ° 15 ʹ 55 ʺ Eı hydroids on coralı 20 m depthı 5 February 1996 ı coll. I. Takeuchi; 3 malesı 1 mature femaleı AM P. 48615 ı South Solitary Islandı Solitary Islandsı New South Walesı 30 ° 12 ʹ 19 ʺ S 153 ° 15 ʹ 55 ʺ Eı hydroids on coralı 20 m depthı 5 February 1996 ı coll. I. Takeuchi; 1 maleı 2 mature femalesı AM P. 48617 ı South Solitary Islandı Solitary Islandsı New South Walesı 30 ° 12 ʹ 19 ʺ S 153 ° 15 ʹ 55 ʺ Eı red algaı coral zone on rocksı 12 m depthı 5 February 1996 ı coll. I. Takeuchi; 1 males and 1 mature femaleı AM P. 48633 ı ‘ The Canyons ’ ı off North Solitary Islandı Solitary Islandsı New South Walesı 29 ° 55 ʹ 30 ʺ S 153 ° 23 ʹ 14 ʺ Eı hydroids close to lower end of rock wallı 17 m depthı 8 February 1996 ı coll. I. Takeuchi; 3 malesı 1 matureı 3 premature and 1 immature femalesı 1 juvenileı AM P. 48634 ı ‘ The Canyons ’ ı off North Solitary Islandı Solitary Islandsı New South Walesı 29 ° 55 ʹ 30 ʺ S 153 ° 23 ʹ 14 ʺ Eı hydroids close to lower end of rock wallı 17 m depthı 8 February 1996 ı coll. I. Takeuchi; 3 malesı 2 mature and 1 premature femalesı 7 juvenilesı AM P. 48635 ı ‘ The Canyons ’ ı off North Solitary Islandı Solitary Islandsı New South Walesı 29 ° 55 ʹ 30 ʺ S 153 ° 23 ʹ 14 ʺ Eı hydroids in middle of rock wallı 14 m depthı 8 February 1996 ı coll. I. Takeuchi; 2 malesı 1 juvenileı AM P. 48636 ı ‘ The Canyons ’ ı off North Solitary Islandı Solitary Islandsı New South Walesı 29 ° 55 ʹ 30 ʺ S 153 ° 23 ʹ 14 ʺ Eı hydroids on top of rocksı 8 m depthı 8 February 1996 ı coll. I. Takeuchi; 1 maleı AM P. 48653 ı Korffs Isletı Solitary Islandsı New South Walesı 30 ° 19 ʹ 03 ʺ S 153 ° 09 ʹ 15 ʺ Eı hydroidsı 8 m depthı 6 February 1996 ı coll. I. Takeuchi I.; 5 malesı 5 mature and 1 immature femalesı 1 juvenileı AM P. 48664 ı ‘ Bubble Cave ’ ı off North Solitary Islandı New South Walesı 29 ° 55 ʹ 40 ʺ S 153 ° 23 ʹ 21 ʺ Eı hydroids near top of rock wallı 8 m depthı 8 February 1996 ı coll. I. Takeuchi and S. D. A. Smith; 10 malesı 8 matureı 3 prematureı and 2 immature femalesı AM P. 48665 ı ‘ Bubble Cave ’ ı off North Solitary Islandı New South Walesı 29 ° 55 ʹ 40 ʺ S 153 ° 23 ʹ 21 ʺ Eı Pterocladia capillacea near top of rock wallı 8 m depthı 8 February 1996 ı coll. I. Takeuchi; 2 malesı 1 mature femaleı AM P. 48666 ı ‘ Bubble Cave ’ ı off North Solitary Islandı New South Walesı 29 ° 55 ʹ 40 ʺ S 153 ° 23 ʹ 21 ʺ Eı Pterocladia capillacea near top of rock wallı 8 m depthı 8 February 1996 ı coll. I. Takeuchi; 1 mature femaleı AM P. 48667 ı ‘ Bubble Cave ’ ı off North Solitary Islandı New South Walesı 29 ° 55 ʹ 40 ʺ S 153 ° 23 ʹ 21 ʺ Eı Pterocladia capillacea near top of rock wallı 8 m depthı 8 February 1996 coll. I. Takeuchi; 13 malesı 10 mature and 1 premature femalesı AM P. 48668 ı ‘ Bubble Cave ’ ı off North Solitary Islandı New South Walesı 29 ° 55 ʹ 40 ʺ S 153 ° 23 ʹ 21 ʺ Eı Pterocladia capillacea near top of rock wallı 8 m depthı 8 February 1996 ı coll. I. Takeuchi; 7 malesı 5 mature femalesı 2 juvenilesı AM P. 48670 ı ‘ Bubble Cave ’ ı off North Solitary Islandı New South Walesı 29 ° 55 ʹ 40 ʺ S 153 ° 23 ʹ 21 ʺ Eı hydroids in middle of rock wallı 13 m depthı 8 February 1996 ı coll. I. Takeuchi. Type locality Solitary Islandsı New South Walesı Australia.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFE2CE738AAB249DF0F2FA86.taxon	description	Description Holotype, male ı body length 7.90 mmı AM P. 101913. Head 0.48 mm; pereonite 1 ı 0.38 mm; pereonite 2 ı 1.44 mm; pereonite 3 ı 1.85 mm; pereonite 4 ı 1.61 mm; pereonite 5 ı 1.41 mm; pereonite 6 ı 0.36 mm; pereonite 7 ı 0.36 mm. Head / pereonite 1 fused (suture present) with small mid-dorsal hump; eyes largeı distinctive. Antenna 1 0.6 × body length; peduncle article 2 longest; flagellum 0.7 × peduncular lengthı with 13 articlesı proximal article composed of 3 articles. Antenna 2 ı 0.5 × antenna 1 length; flagellum 0.12 × peduncular lengthı flagellum with 2 articles. Upper lip weakly notchedı forming rounded quadrilateral projections. Mandible right incisor with 5 teeth; lacinia mobilis with 5 teethı with 3 bundled setal rows; palp 3 - articulate; article 3 setal formula 1 – 9 – 1 – 1; molar well developed; left incisor with 5 teeth; lacinia mobilis with 3 teethı with 3 bundled setal rows; palp article 2 with 5 lateral setae; palp article 2 setal formula 1 – 9 – 1 – 1. Lower lip finely setose on inner and outer lobes. Maxilla 1 outer plate with 7 stout apical setal-teeth; palp distal margin with 4 triangular projectionsı each with a slender or robust setaı with a row of 3 slender setae. Maxilla 2 inner plateı triangular with 8 apical setae; outer plate elongate with 8 apical setae. Maxilliped basal endite (inner plate) ovalı with 1 small nodular setaı with 4 setae near distal margin; ischial endite (outer plate) 2.2 × inner plateı inner margin smoothı with 2 setae on inner marginı with 1 – 2 setae on distal margin; palp article 2 setose on inner margin; palp article 3 without distal projectionı with about 11 moderately dense distal setae; palp article 4 enlargedı blunt. Pereon. Pereonite 2 with minute anterolateral projectionı with midlateral projectionı with paired mid-dorsal triangular projections. Pereonite 3 longestı with minute anterolateral projection. Gnathopod 1 carpus and propodus setose; propodus trianguları with 3 – 4 rows of submarginal setae near anterior marginı propodus palm begins less than 0.25 along anterior margin of propodusı propodus with 1 robust seta near corner of palm. Gnathopod 2 begins 0.20 along anterior margin of corresponding pereonite; coxa vestigial; basis subequal in length to pereonite 2 ı with anterodistal projection; ischium with anterodistal projection; carpus 0.17 × propodus length; propodus largeı elongated (subrectangular) ı length 2 × widthı anterodistal margin widely concaveı propodus with anterodistal triangular projection; palm proximal projection with 1 robust (grasping) seta; propodus palm irreguları with hook-like projection at base of dactylusı with midpalmar projectionı with deep sinusı with broadı well-developed distal shelfı distal shelf with two triangular projections distally. Gill 3 gill ovateı length 0.30 × corresponding pereonite. Pereopod 3 very slenderı with 2 articles; length 3 × width; article 1 (or basal article) with 5 distal and 3 lateral setae; article 2 (or distal article) tinyı conical with 1 lateral seta. Gill 4 ovateı length 0.5 × corresponding pereonite. Pereopod 4 with 2 articlesı similar to pereopod 3. Pereopod 5 slender; basis longer than propodus; carpus with ca. 12 setae on anterior to distal margin; propodus with 1 pair of robust setae from 1 / 5 on anterior marginı with 8 short setae along palm; dactylus curvedı not setose. Pereopod 6 more robust than pereopod 5. Pereopod 7 more robust than pereopod 6. Pleon. Pleopods absent. Uropod 1 bi-articulate; peduncle elongateı length about 2.5 × widthı with 6 distal and 2 lateral setae; ramus length about 0.3 × peduncular lengthı about 2 × widthı with 2 setae. Uropod 2 vestigial. Telson (dorsal lobe) present. Paratype, mature female (sexually dimorphic characters) ı body length 5.39 mmı AM P. 48667. Head 0.39 mm; pereonite 1 ı 0.21 mm; Pereonite 2 ı 1.02 mm; Pereonite 3 ı 1.17 mm; Pereonite 4 ı 0.87 mm; Pereonite 5 ı 1.02 mm; Pereonite 6 ı 0.27 mm; Pereonite 7 ı 0.44 mm. Pereonite 3 with anterolateral triangular projectionı with anterodorsal lobe. Pereonite 4 with anterolateral lobe. Gnathopod 2 begins 0.15 along anterior margin of corresponding pereonite; propodus anterodistal margin slightly widely concave; propodus palm without hook-like projection at base of dactylusı with deepı narrow sinus. Gill 3 gill ovateı length 0.40 × corresponding pereonite. Gill 4 length 0.7 × corresponding pereonite.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFE2CE738AAB249DF0F2FA86.taxon	etymology	Etymology The species name ’ is derived from cornu ı based on “ horn ” - like mid-dorsal triangular projections on pereonite 2.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFE2CE738AAB249DF0F2FA86.taxon	discussion	Remarks Notoprotella cornuta sp. nov. differs from N. berentsae (Takeuchi and Lowryı 2007 b) by the following species diagnostic characters: (1) presence of small mid-dorsal hump on head of N. cornuta sp. nov.; (2) while pereonite 2 of N. cornuta sp. nov. has midlateral projection near the base of gnathopod 2 ı N. berentsae lacks this projection; (3) while in N. cornuta sp. nov. the mid-dorsal projection of pereonite 2 is distinct and trianguları N. berentsae is smallı and subtriangular; (4) while in uropod 2 of N. cornuta sp. nov. the ramus is about 1 / 3 of peduncular lengthı N. berentsae is less than 1 / 4 of peduncular length. Thusı we established the new speciesı Notoprotella cornuta sp. nov.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFE7CE7F8ACD2569F704FE35.taxon	description	(Figures 11 ı 12)	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFE7CE7F8ACD2569F704FE35.taxon	materials_examined	Material examined 1 mature femaleı AM E. 6563 ı 39 ° 00 ʹ S 148 ° 40 ʹ Eı eastern slope of Bass Straitı Tasmaniaı FIS ‘ Endeavour ’ ı 1909 – 1914; 1 mature and 1 immature femalesı AM P. 47825 ı 34 ° 05 ʹ S 151 ° 15 ʹ Eı 3 – 4 km off Botany Bayı New South Walesı Australiaı HMCS Thetis Stn. 37 ı mudı 91 – 95 m depthı 11 March 1898 ı coll. E. R. Waite; 2 malesı 1 premature femaleı AM P. 47826 ı 34 ° 03 ʹ 30 ʺ S 151 ° 12 ʹ 30 ʺ Eı 2 – 3 km off Port Hackingı New South Walesı Australiaı HMCS Thetis Stn 35 ı sandyı 40 – 69 m depthı 10 March 1898 ı coll. E. R. Waite; 1 mature femaleı AM P. 98913 ı 43 ° 15 ʹ S 147 ° 16 ʹ Eı d ’ Entrecasteaux Channelı possibly an Endeavour collection; 1 fragment (male) ı AM P. 101912 ı 34 ° 05 ʹ S 151 ° 15 ʹ Eı 3 – 4 km off Botany Bayı New South Walesı Australiaı HMCS Thetis Stn 37 ı mudı 91 – 95 m depthı 11 March 1898 ı coll. E. R. Waite. Type localities Mountain Creek and Mountain Riverı Tasmaniaı Australia. Other localities Off Botany Bay and off Port Hackingı New South Wales and Eastern slope of Bass Straightı Tasmaniaı Australia.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFE7CE7F8ACD2569F704FE35.taxon	description	Description Male ı body length 13.49 mm (estimated based on fig. 39 in Guerra-García and Takeuchi 2004) ı AM P. 101912. Head 1.01 mm; pereonite 1 ı 0.86 mm; pereonite 2 ı 2.62 mm. Head with anteriorly forwarded triangular dorsal projection; eye largeı distinctive. Antenna 1 slenderı 13.39 mm; peduncle article 2 longest; peduncular article 3 straight; flagellum 1.2 × peduncular lengthı with 24 articlesı proximal article composed of 2 articles. Antenna 2 slenderı 0.45 × antenna 1 length. Upper lip notchedı forming rounded quadrilateral projections. Mandible right incisor with 5 teeth; lacinia mobilis with 5 teethı with 2 bundled accessory setal rows; palp 3 - articulateı palp article 2 with 5 lateral setae; palp article 3 setal formula 1 – 20 – 5 – 1; molar well developed; left incisor with 5 teeth; lacinia mobilis with 5 teethı with 3 bundled setal rows; palp 3 - articulate; palp article 2 with 6 lateral setae; palp article 3 setal formula 1 – 21 – 4 – 1. Lower lip finely setose on inner and outer lobes. Maxilla 1 outer plate with 7 stout apical setal-teeth; palp distal margin with 3 triangular projectionsı each with a slender or robust setaı with 2 setaeı with a row of slender setae. Maxilla 2 triangular with 8 apical setae; outer plate rectangular with 11 apical setae. Maxilliped inner plate ovalı with 4 setae near distal margin; outer plate 2.5 × length of inner plateı inner marginı with 3 setae on outer margin; palp article 2 setose on inner margin; palp article 3 ı with 15 distal to lateral setae; palp article 4 weakly falcate. Pereon. Pereonite 2 with small anterolateral projectionı with tiny midlateral projectionı with paired mid-dorsal projections. Mature female ı body length 17.90 mmı AM E. 6563. Head 1.02 mm; pereonite 1 ı 1.10 mm; pereonite 2 ı 3.54 mm; pereonite 3 ı 3.54 mm; pereonite 4 ı 2.98 mm; pereonite 5 ı 3.59 mm. Pereonites 6 and 7 partially fusedı 2.15 mm. Head / pereonite 1 fused (suture present); eyes largeı distinctiveı with anterodorsal projection. Antenna 1 at least 0.8 × body length; peduncle article 2 longest; flagellum with 11 + articlesı flagellum proximal article composed of 3 fused articles. Antenna 2 ı without dense concentration of long slender setae along posterior margin; flagellum about 1 / 6 (0.17 ×) of peduncular lengthı flagellum with 2 articles. Pereon. Pereonite 2 with anterolateral bifurcated projectionı with midlateral projectionı with paired mid-dorsal projection. Pereonite 3 with anterolateral bifurcated projectionı with round distolateral projection. Pereonite 4 with round anterolateral projection. Gnathopod 2 begins 0.40 along anterior margin of corresponding pereonite; coxa vestigial; basis subequal in length to pereonite 2 ı with anterodistal projection; ischium with anterodistal projection; carpus 0.17 × propodus length; propodus largeı elongate (subrectangular) ı length 2.3 × widthı anterodistal margin narrowly concaveı with anterodistal triangular projection; palm proximal projection with 1 robust (grasping) setaı palm smoothı setoseı with large midpalmar projectionı with deepı narrow sinusı with well-developed distal shelfı with 1 large projection. Gill 3 elongateı length 0.6 × corresponding pereoniteı curved anteriorly. Pereopod 3 elongateı with 2 articles; length 3 × width. Gill 4 elongateı length 0.65 × corresponding pereoniteı curved anteriorly. Pereopod 4 ı similar to pereopod 3.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFE7CE7F8ACD2569F704FE35.taxon	discussion	Remarks No specimens were reported after the type material was collected from Mountain Creek and Mountain Riverı Tasmania in Marchı 1954 (Guiler 1954). We found additional specimens for this species from the collection of the Australian Museum; these specimens were collected prior to the 1920 s from New South Wales and Tasmania. Guerra-García and Takeuchi (2004) noted that the condition of the type specimens deposited at the Tasmanian Museum and Art Gallery were in very poor condition and partially dried up. Of the old collections at the Australian Museumı the damaged maleı estimated as 13.49 mm in body lengthı collected from off Botany Bayı New South Wales was described and figured in detail. The mature female from the eastern slope of Bass Straightı Tasmania was also described. The present description of O. gordoni including mouth parts agrees well with the generic diagnosis of Notoprotella gen. nov.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFEBCE78895B21DAF2D9FC42.taxon	description	(Figure 13)	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFEBCE78895B21DAF2D9FC42.taxon	materials_examined	Material examined One mature femaleı AM P. 54266 ı 33 ° 17 ʹ S 151 ° 41 ʹ Eı east of Norah Headı New South Walesı June 1921 ı coll. A. A. Livingstoneı F. A. McNeillı S. T. Goonambee (Figure 13). Locality East of Norah Headı New South Walesı Australia.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFEBCE78895B21DAF2D9FC42.taxon	description	Description Mature female ı body length 12.63 mmı AM P. 54266. Head 0.86 mm; pereonite 1 ı 0.82 mm; pereonite 2 ı 2.49 mm; pereonite 3 ı 2.37 mm; pereonite 4 ı 2.17 mm; pereonite 5 ı 2.64 mm. Pereonites 6 and 7 partially fusedı 1.27 mm. Head / pereonite 1 fused (suture present); head with paired anteriorly forwarded dorsal projections; eyes largeı distinctive. Antenna 1 at least 0.9 × body length; peduncle article 2 longest; flagellum at least 0.5 × peduncular lengthı with 14 + articlesı flagellum proximal article composed of 3 fused articles. Antenna 2 with short setae along posterior margin; flagellum about 0.2 × of peduncular lengthı flagellum with 2 articles. Pereon. Pereonite 2 longestı with small anterolateral projectionı with small midlateral projectionı with small paired mid-dorsal projections. Pereonite 3 with subacute anterolateral projection. Pereonite 4 with round anterolateral projection. Gnathopod 2 begins 0.3 along anterior margin of corresponding pereonite; coxa vestigial; basis subequal in length to pereonite 2 ı with anterodistal projection; ischium with anterodistal projection; carpus 0.17 × propodus length; propodus largeı elongated (subrectangular) ı length 2.3 × widthı anterodistal margin narrowly concaveı with small anterodistal triangular projection; palm proximal projection with 1 robust (grasping) setaı palm smoothı setoseı with midpalmar projectionı with narrow sinusı with distal shelfı with 1 large projection. Gill 3 elongateı length 0.7 × corresponding pereonite. Pereopod 3 slenderı with 2 articles; length 5 × width; Gill 4 elongateı length 0.6 × corresponding pereoniteı curved anteriorly. Pereopod 4 ı similar to pereopod 3.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFEBCE78895B21DAF2D9FC42.taxon	discussion	Remarks The present species is closest to Notoprotella gordoni (Guilerı 1954) ı but differs clearly from N. gordoni by the paired dorsal projection on headı instead of the single projection in N. gordoni (Guilerı 1954). Most of the descriptions of Notoprotella and related genera were based on the large male specimens. Howeverı only one mature female has been found until now. Thusı we retain the present specimen as sp. belonging to Notoprotella.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFECCE798AB1242BF2CFFC0C.taxon	diagnosis	Diagnosis Head fused (suture present) with pereonite 1. Antenna 1 well developed; flagellum with more than 2 articles. Antenna 2 well developed; flagellum with 2 articles. Mandible well developed; molar presentı well developed; palp 3 - articulateı setal formula 1 – x – 1 or 1 – x – y – 1. Maxilliped well developed; inner plate (basal endite) smaller than outer plate (ischial endite); outer plate (ischial endite) well developed; palp article 3 with distal projection; palp article 4 well developed. Pereonite 4 clavate appendage absent. Pereonites 6 and 7 dorsal suture oblique or separated. Pereopod 3 vestigialı with 1 – 2 articles. Pereopod 4 vestigialı with 1 – 2 articles. Pereopod 5 well developedı with 7 articlesı with sparseı short setaeı with welldeveloped dactylus. Pereopods 6 and 7 well developedı with 7 articles. Gills on pereonites 3 and 4. Pleopods absent. Uropods 2 pairs. Uropod 1 uniramous. Uropod 2 vestigial (unclear). Telson (dorsal lobe) present.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFECCE798AB1242BF2CFFC0C.taxon	type_taxon	Type species Protella australis Haswellı 1879 ı original desgnation. Included species Orthoprotella includes 7 species: O. australis (Haswellı 1879); O. bicornis Lim et al. ı 2015; O. hamata Arimotoı 1981; O. mayeri K. H. Barnard 1916; O. melloi Quiteteı 1975; O. nana Guerra-Garcíaı 2004; O. spinigera Moriı 1996.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFECCE798AB1242BF2CFFC0C.taxon	discussion	Remarks The diagnosis of the present genus was modified based on the description in the present study including type material of O. australis (Haswellı 1879) ı type species of the genusı provided by Takeuchi (1993). Orthoprotella is the most similar genus to Protella Danaı 1852 but differs by the presence of distal projection in the third article of the mandibular palp and the lack of knob-like appendage on uropod 1 (Table 1). The former characteristic was introduced as one of the generic diagnoses for the Caprellidae in the description of Metaprotella spp. (see Takeuchi and Lowry 2007 a; Lim and Takeuchi 2012) ı and the latter was found in the redescription based on the old type specimens of Protella gracilis Danaı 1853 ı the type species of the genus Protella by Takeuchi et al. (2014). These characteristics are confirmed in the other species of Orthoprotella: O. bicornis Lim et al. ı 2015 (see Lim et al. 2015) ı O. mayeri K. H. Barnard 1916 (see Takeuchi and Lowry 2007 b) ı O. nana Guerra-Garcíaı 2004 (see Guerra-García 2004) ı O. spinigera Moriı 1996 (see Mori 1996; Takeuchi and Inoue 2014). Since these characteristics in O. melloi Quiteteı 1975 and O. hamata Arimotoı 1981 are unclearı these two species are retained in Orthoprotella.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFEDCE478AD123E0F285FF40.taxon	description	(Figures 14 – 16)	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFEDCE478AD123E0F285FF40.taxon	materials_examined	Type material Syntypes: 3 malesı 3 mature femalesı AM G. 2557 ı 33 ° 51 ʹ S 151 ° 16 ʹ Eı Port Jacksonı New South Wales; 8 malesı 4 mature and 1 immature femalesı AM G. 2558 ı 33 ° 51 ʹ S 151 ° 16 ʹ Eı Port Jacksonı New South Wales; 24 malesı 22 mature and 7 immature femalesı 1 juvenileı AM P. 3385 ı 33 ° 51 ʹ S 151 ° 16 ʹ Eı Port Jacksonı New South Wales; 1 maleı AM P. 97313 ı 33 ° 51 ʹ S 151 ° 16 ʹ Eı Port Jacksonı New South Wales; 1 mature femaleı AM P. 97314 ı 33 ° 51 ʹ S 151 ° 16 ʹ Eı Port Jacksonı New South Wales. Additional material examined One maleı 1 mature and 1 immature femalesı AM G. 932 ı 35 ° 03 ʹ S 150 ° 44 ʹ Eı Jervis Bayı New South Walesı coll. T. Whitelegge; 2 malesı 2 mature femalesı AM G. 2563 ı 32 ° 43 ʹ S 152 ° 08 ʹ Eı Nelsons Bayı Port Stephensı New South Wales; 1 individualı AM P. 2549 ı 31 ° 57 ʹ S 152 ° 46 ʹ Eı 6.5 – 10.5 km off Manning Riverı New South Walesı fine grey sandı HMCS Thetisı Stn 28 ı coll. E. R. Waite; 1 mature femaleı AM P. 46916 ı 33 ° 51 ʹ S 151 ° 16 ʹ Eı Port Jacksonı New South Wales; 3 malesı 4 mature and 1 immature femalesı AM P. 47601 ı 32 ° 42 ʹ S 152 ° 06 ʹ Eı Port Stephensı New South Wales; 9 malesı 14 mature and 3 immature femalesı 1 juvenileı AM P. 47604 ı 33 ° 51 ʹ S 151 ° 16 ʹ Eı Port Jacksonı New South Wales; 1 maleı 1 mature and 1 immature femalesı 1 juvenileı AM P. 47605 ı unknown locality; 1 maleı AM P. 47627 ı 32 ° 42 ʹ S 152 ° 06 ʹ Eı Port Stephensı New South Wales; 1 maleı AM P. 47779 ı 33 ° 33 ʹ S 151 ° 14 ʹ Eı Hawkesbury Riverı 200 m south-east of Croppy Pointı New South Walesı sandy mudı Hawkesbury River Surveyı HRS 2 – 3 February 1984 ı 9 February 1984 ı coll. A. R. Jonesı A. Murray; many individualsı AM P. 52925 ı 34 ° 36 ʹ S 150 ° 54 ʹ Eı Bass Pointı New South Walesı 45 – 50 m depthı 25 June to 26 July 1990 ı coll. The Ecology Lab for RMI / Pioneer Project; 1 maleı AM P. 47603 ı 42 ° 15 ʹ 00 ʺ S 146 ° 30 ʹ Eı Tasmania; 1 maleı AM P. 54269 ı 33 ° 51 ʹ S 151 ° 16 ʹ Eı Port Jacksonı New South Wales; 1 maleı 4 mature femalesı AM P. 98969 ı 33 ° 51 ʹ S 151 ° 16 ʹ Eı Port Jacksonı New South Wales. Type locality Port Jacksonı New South Walesı Australia. Other localities Off Manning Riverı Port Stephensı Hawkesbury Riverı Bass Point and Jervis Bayı New South Walesı and Tasmaniaı Australia.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFEDCE478AD123E0F285FF40.taxon	description	Description Syntype, male ı body length 15.02 mmı AM P. 97313 ı and maleı body length 13.35 mmı P. 54269 ı for pereopods 5 – 7. Head 0.76 mm; pereonite 1 ı 1.20 mm; pereonite 2 ı 2.58 mm; pereonite 3 ı 3.09 mm; pereonite 4 ı 3.09 mm; pereonite 5 ı 3.06 mm. Pereonites 6 and 7 partially fusedı 1.24 mm. Head / pereonite 1 fused (suture present); eyes largeı distinctiveı with small paired anterodorsal projections. Antenna 1 at least 0.9 × body length; peduncle article 2 longest; flagellum at least 0.4 × peduncular lengthı with 18 + articlesı flagellum proximal article composed of 3 fused articles. Antenna 2 ı 0.4 × antenna 1 length; without dense concentration of long slender setae along posterior margin; flagellum 0.15 × of peduncular lengthı flagellum with 2 articles. Upper lip notchedı forming rounded quadrilateral projections. Mandible right incisor with 5 teeth; lacinia mobilis with 3 teethı with 2 bundled setal rows; palp 3 - articulateı palp article 2 with 13 lateral setae; palp article 3 setal formula 1 – 27 – 4 – 1; molar well developedı with flake; left incisor with 5 teeth; lacinia mobilis with 5 teethı with 3 bundled setal rows; palp 3 - articulate; palp article 2 with 13 lateral setae; palp article 3 setal formula 1 – 28 – 3 – 1. Lower lip finely setose on inner and outer lobes. Maxilla 1 outer plate with 7 stout apical setal-teeth; palp distal margin with 6 triangular projectionsı each with a slender or robust setaı with a row of slender setae. Maxilla 2 inner plate trianguları with 11 apical robust setae; outer plate elongateı with about 15 apical setae. Maxilliped inner plate ovalı with 1 small nodular setaı with 4 setae near distal margin; outer plate 2.3 × length of inner plateı inner margin weakly serrateı with 5 setae on outer margin; palp article 2 setose on inner margin; palp article 3 with distal projectionı with about 11 moderately dense distal setae; palp article 4 weakly falcate. Pereon. Pereonite 2 with tiny anterolateral projectionı Pereonite 3 with subacute anterolateral projection. Gnathopod 1 merus and propodus setose; propodus trianguları with 5 – 6 rows of submarginal setae near anterior margin; propodus with 1 robust seta near corner of palm; propodus palm minutely serrateı dactylus straightı dactylus inner margin serrate. Gnathopod 2 begins 0.40 along anterior margin of corresponding pereonite; coxa vestigial; basis subequal in length to pereonite 2 ı with basal projectionı with anterodistal projection; ischium with anterodistal projection; carpus 0.17 × propodus length; propodus largeı elongate (subrectangular) ı length 2.8 × widthı anterodistal margin narrowly concaveı with small anterodistal triangular projection; palm proximal projection with 1 robust (grasping) setaı palm smoothı setoseı with large midpalmar projectionı with deepı narrow sinusı with well-developed distal shelfı with 1 large projection. Gill 3 elongateı length 0.6 × corresponding pereoniteı curved anteriorly. Pereopod 3 slenderı with 2 articles; length 4 × width; article 1 (or basal article) with 5 distal and 1 lateral setae; article 2 (or distal article) tinyı conical. Gill 4 elongateı length 0.5 × corresponding pereoniteı curved anteriorly. Pereopod 4 ı slenderı with 2 articlesı similar to pereopod 3. Pereopod 5 slender; basis longer than propodus; carpus longer than basisı densely setose with 5 on anterior to distal margin; propodus with 1 pair of robust setae from 1 / 5 on anterior marginı with 14 short setae along palm; dactylus curvedı not setose. Pereopod 6 more robust and shorter than pereopod 5; carpus shorter than basis. Pereopod 7 more robust than pereopod 6. Pleon. Pleopods absent. Uropod 1 bi-articulate; peduncle elongateı length about 2.5 × width; ramus length 1 × peduncular lengthı about 3 – 4 × widthı with 1 distal and 3 – 4 lateral setae. Uropod 2 vestigial. Telson (dorsal lobe) present. Syntype, mature female (sexually dimorphic characters) ı body length 10.92 mmı AM P. 97314. Head 0.71 mm; pereonite 1 ı 0.62 mm; pereonite 2 ı 2.00 mm; pereonite 3 ı 2.22 mm; pereonite 4 ı 1.91 mm; pereonite 5 ı 2.40 mm. Pereonites 6 and 7 partially fusedı 1.07 mm. Pereonite 3 without subacute anterolateral projection. Pereonite 4 with round anterolateral projection. Gnathopod 2 begins 0.30 along anterior margin of corresponding pereonite; propodus ovateı length 2.3 × width. Gill 3 ovate. Gill 4 ovate.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
0391B015FFEDCE478AD123E0F285FF40.taxon	discussion	Remarks Orthoprotella australis Haswellı 1879 was briefly described based on specimens collected from Port Jacksonı New South Wales. Later Mayer (1903) described a male (18 mm) and female (14 mm) collected from Nelsons Bayı Port Stephensı New South Wales. The syntypes of the present speciesı deposited in the Australian Museumı consist of three samples collected from Port Jacksonı registered as AM P. 3385 ı AM G. 2557 and AM G. 2558. A male and a mature female from the syntype seriesı originally registered as AM P. 3385 ı were redescribed and illustrated for the present study under the new register number of AM P. 97313 and AM P. 97314. In addition to New South Walesı Australiaı Orthoprotella australis has been reported from tropical areas of the Indo-Pacific: Ceram Seaı Arafura Seaı Banda Sea and Sawu Sea (McCain and Steinberg 1970) ı Northern Territory and northern coast of Western Australiaı Australia (Guerra-García 2004) and Queenslandı Australia (Guerra-García 2006; Guerra-García and Lowry 2009). Guerra-García (2004) figured Orthoprotella australis from Western Australia with small gills 3 and 4 and pereonite 4 lacking anterolateral projection. Howeverı gills on pereonites 3 and 4 of Orthoprotella australis from Queensland are rather elongated (Guerra-García 2006; Guerra-García and Lowry 2009). Pereonite 4 of the Queensland specimens also lacks an anterolateral projection (Guerra-García 2006; Guerra-García and Lowry 2009). These morphological diversities suggest that the distribution of Orthoprotella australis in tropical areas of the Indo-Pacific (McCain and Steinberg 1970; Guerra-García 2004 ı 2006; Guerra-García and Lowry 2009) is questionable. Prior to the present studyı Metaprotella excentrica Mayerı 1890 [sensu lato] was recorded from the south of India to Sri Lanka and New South Walesı Australia. Of themı Metaprotella guileri sp. nov. was described based on the specimens collected from New South Wales. Orthoprotella mayeri K. H. Barnard 1916 [sensu lato] was considered to have a distribution from South Africa and New South Walesı Australia. Takeuchi and Lowry (2007 b) established Orthoprotella berentsae Takeuchi and Lowryı 2007 b for O. mayeri K. H. Barnard 1916 [sensu lato] from New South Wales. Recentlyı Takeuchi and Oyamda (2013) conducted the detailed comparison of Caprella californica Stimpsonı 1857 [sensu lato] from both sides of the North Pacificı and proposed Caprella scauroides Mayerı 1903 to a species level for the Japanese C. californica [sensu lato]. Further detailed studies on Orthoprotella australis from the tropical area is necessary to clarify their taxonomical position.	en	Takeuchi, Ichiro, Lowry, James K. (2019): A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia. Journal of Natural History 53 (17): 1023-1059, DOI: 10.1080/00222933.2019.1589590
