taxonID	type	description	language	source
A02387D80055FFDCFF56FEA5FBCCE97B.taxon	discussion	Remarks. Cirolana can be identified by having the following combination of relatively easy to observe characters: frontal lamina with a relatively wide and ventral flat surface, clypeus always flat (i. e., without ventral or anterior projecting blade), pleonite 5 always laterally entirely overlapped by pleonite 4; mandible incisor visibly broad, more than 0.5 mandible width (see Bruce & Hughes 2020), pereopods all ambulatory (i. e., without marked flatting of articles or presence of long natatory setae), pereopods 1 – 3 without anterolateral margins of ischium and or merus strongly produced and pleopod 2 appendix masculina attached basally. The concept of what constituted Cirolana Leach, 1818, then with 114 species, was wholly revised by Bruce (1981), resulting in the genus including just 44 species. Since that time the genus has again grown, now the largest in the family with 144 species (see Sidabalok & Bruce 2018 a), and in the course of that time it has been increasingly recognized that there are distinct groups within the genus (Bruce 1986, 2004; Sidabalok & Bruce 2017, 2018 a). Sidabalok (2019) demonstrated that there are five definable monophyletic clades within Cirolana, each clade supported by definable synapomorphies. One such clade was termed the Cirolana ‘ pleonastica - group’ by Sidabalok & Bruce (2018 a); both new species described here belong to that group. The critical apomorphic characters that define the Cirolana ‘ pleonastica - group’ include: rostral point absent, transverse sutures present on all or most pereonites, pleonites 3 and 4 with small nodules, uropod endopod with setae on distal third, and uropodal exopod lateral margin with three widely spaced relatively slender robust setae. There are several other characters consistently shown by species of this group, including all species in the group with the lateral margins of pleonite 3 not posteriorly produced, not overlapping pleonites 4 and 5 and the posterolateral margins (epimera) of pleonite 4 are posteriorly rounded. At present the Cirolana ‘ pleonastica - group’ has been recorded primarily from the tropical Indo-Pacific Ocean with one species from the Antarctic. Both new species described here belong to the Cirolana ‘ pleonastica - group’.	en	Rodcharoen, Eknarin, Bruce, Niel L. (2021): Two new species of the marine isopod genus Cirolana Leach, 1818 (Crustacea Isopoda: Cirolanidae) from the coast of the western Gulf of Thailand. Zootaxa 4950 (3): 469-486, DOI: 10.11646/zootaxa.4950.3.3
A02387D80055FFD7FF56FB4DFCC5EC63.taxon	description	(Figs 2 – 7)	en	Rodcharoen, Eknarin, Bruce, Niel L. (2021): Two new species of the marine isopod genus Cirolana Leach, 1818 (Crustacea Isopoda: Cirolanidae) from the coast of the western Gulf of Thailand. Zootaxa 4950 (3): 469-486, DOI: 10.11646/zootaxa.4950.3.3
A02387D80055FFD7FF56FB4DFCC5EC63.taxon	materials_examined	Material examined. Holotype: ♂ (6.5 mm), Koh Kham, Songkhla Province, 6 ° 58 ’ 18.84 ” N, 100 ° 51 ’ 25.54 ” E, 9 July 2011, trapped at 8 m depth, coral reef, coll. E. Rodcharoen (PSUZC-CR 2087 - 01). Paratypes: 9 ♂ (7.9, 8.2, 7.3, 7.7, 8.3, 7.1, 7.6, 8.2, 8.4 mm) [dissected]), 7 ♀ (7.4, 7.8, 8.5, 7.9, 8.3, 8.5, 7.8 mm [dissected]), same data as holotype, (PSUZC-CR 2087 - 02).	en	Rodcharoen, Eknarin, Bruce, Niel L. (2021): Two new species of the marine isopod genus Cirolana Leach, 1818 (Crustacea Isopoda: Cirolanidae) from the coast of the western Gulf of Thailand. Zootaxa 4950 (3): 469-486, DOI: 10.11646/zootaxa.4950.3.3
A02387D80055FFD7FF56FB4DFCC5EC63.taxon	description	Description of male. Body dorsal surfaces punctuate, widest at pereonite 5 or pereonite 6, lateral margins subparallel. Rostral point absent. Eyes colour brown in alcohol; eyes separated by about 80 % width of head. Pereonites 1 – 3 each with a single transverse impressed line, pereonites 4 – 6 each with 2 transverse impressed lines; pereonite 7 with 3 tranverse lines with posterior line forming nodulose ridge. Pereonite 1 and coxae 2 – 3 each with posteroventral angle rounded; coxae 5 – 7 with entire oblique carina. Pleon with pleonite 1 largely concealed by pereonite 7; pleonites 3 – 5 with tubercles; posterolateral angles of pleonite 2 rounded, extending posteriorly to anterior of pleonite 4; pleonite 3 with row of 11 – 13 tubercles, posterolateral margins extending to but not beyond posterior margin of pleonite 5, narrow rounded; pleonite 4 with prominent median tubercles and 3 – 4 sublateral tubercles on each side, posterolater margins rounded, clearly extending beyond posterior margin of pleonite 5; pleonite 5 with prominent median tubercles and 2 – 3 sublateral tubercles on each side, posterolateral angles overlapped by lateral margins of pleonite 4. Pleotelson 0.7 times as long as anterior width, dorsal surface with paired submedian logitudinal carina, each of which has 4 tubercles; lateral margins weakly concave; margins smooth, posterior margin evenly rounded, with 8 robust setae. Antennula peduncle articles 1 and 2 distinct articulated; article 2 0.5 times as long as article 1; article 3 and 4 0.9 times as long as combined lengths of articles 1 and 2, article 3 1.8 times as long as wide; flagellum with 9 articles, extending to posterior margin of eye. Antenna peduncle article 4 1.8 times as long as wide, 2.6 times as long as article 3, posterodistal angle with 1 short simple seta; article 5 1 times as long as article 4, 2.5 times as long as wide, anterodistal angle with cluster of 4 setae (2 simple and 2 palmate setae), anterodistal angle with cluster of 2 simple setae and 2 palmate setae; flagellum with 20 articles, extending to middle of pereonite 3. Frontal lamina pentagonal, 2.2 times as longer than greatest width, lateral margins straight, diverging slightly towards anterior, anterior margin acute. Left mandible molar process anterior margin with 15 flat teeth; with proximal cluster of long simple setae; left mandible spine row composed of 8 spines; palp articles 2 with 14 distolateral setae, palp article 3 with 17 biserrate RS. Left maxillula mesial lobe with 3 large and circumplumose RS; lateral lobe with 12 RS. Right maxilla lateral lobe with 5 long setae; middle lobe with 13 long setae; mesial lobe with 3 distal long setae and 12 proximal long setae. Right maxilliped palp article 2 mesial margin with 7 slender setae, lateral margin distally with 1 slender seta; article 3 mesial margin with 14 slender setae, lateral margin with 9 slender setae; article 4 mesial margin with 13 slender setae, lateral margin with 5 slender setae; article 5 distal margin 17 setae, lateral margin with 4 setae; endite with 5 long CPS, and 1 coupling setae (both left and right). Pereopod 1 basis 2.3 times as long as greatest width, infererior distal angle with cluster of 2 acute setae; ischium times 0.6 times as long as basis, inferior margin with 2 setae, superior distal margin with 1 RS; merus inferior margin with 6 molariform RS (set as in row of 4 + 2), superior distal angle with 4 setae (slender); carpus inferior distal margin with 2 setae (1 RS and 1 slender seta). Propodus 2.0 times as long as wide, inferior margin with 3 RS; dactylus 0.7 times as long as propodus. Pereopod 2 ischium inferior margin with 2 stout, bluntly rounded RS, superior distal margin with 3 RS (2 simple and 1 biserrate); merus inferior margin with 8 stout RS (set in row of 5 molariform and 3 acute), superior distal margin with 4 acute RS; carpus inferodistal angle with 3 RS (plus 1 slender seta); propodus 1.7 times as long as wide; dactylus 0.9 times as long as propodus. Pereopod 3 similar to pereopod 2. Pereopod 4 intermediate in form between pereopod 3 and pereopod 5. Pereopod 6 similar to pereopod 7. Pereopod 7 basis 2.8 times as long as greatest width, superior margin convex, inferior margin with 4 palmate setae; ischium 0.6 times as long as basis. inferior margin with 7 RS (set in groups of 3, 1 and 3), superior distal angle with 6 RS, inferior distal angle with 2 RS; merus 0.7 times as long as ischium, 1.3 times as long as wide, inferior margin with 4 RS (set in groups of 1 and 3), superior distal angle with 13 RS (2 simple and 11 biserrate), inferior distal angle with 6 RS; carpus times 0.9 times as long as ischium, 1.7 times as long as wide, inferior margin with 3 RS, superior distal angle with 13 RS (simple and biserrate), inferior distal angle with 10 RS (6 simple and 4 biserrate); propodus 1.0 time as long as ischium, 4.4 times as long as wide, inferior margin with 4 RS (set in group 2 and 2), superior distal angle with 3 RS, 1 slender seta and 1 palmate seta, inferior distal angle with 2 RS; dactylus 0.4 times as long as propodus. Penial openings two low tubercles, separated by 25 % of sternal width. Pleopod 1 exopod 1.4 times as long as wide, lateral margin straight, distally broadly rounded, mesial margin strongly convex, with 30 PMS from distal one-third; endopod 2.2 times as long as wide, distally broadly rounded, lateral margin sinuate, with 10 PMS on distal margin only; peduncle 1.6 times as wide as long, mesial margin with 4 coupling hook. Pleopod 2 exopod with 38 PMS, endopod with 13 PMS; appendix masculina with parallel margins, 1.1 times as long as endopod, distally narrowly rounded. Pleopod 3 exopod with 40 PMS, endopod with 11 PMS. Pleopod 4 exopod with 38 PMS, endopod with 9 PMS. Pleopod 5 exopod with 34 PMS. Pleopods 2 – 5 peduncle distolateral margin with prominent acute RS. Uropod peduncle ventrolateral margin with 2 RS, lateral margin with 1 mesial short acute RS, posterior lobe about one-half as long as endopod; rami extending beyond pleotelson, marginal setae in single tier, apices broadly round. Endopod apically not bifid; lateral margin distally convex, without prominent excision, with 2 RS, mesial margin strongly convex, with 7 RS. Exopod not extending to end of endopod, 1.5 times as long as greatest width, apically shallowly and equally sub-bifid; lateral margin weakly convex, with 5 RS; mesial margin convex, with 4 RS. Female. Similar to male but on average a little larger (see ‘ Size’). Variation. Pleotelson (n = 17 [10 ♂ and 7 ♀]) with 7 – 8 RS, with 8 RS (4 + 4) most frequent (76 %). Uropod endopod mesial margin with 6 – 8 RS, with 7 (76 %) and 6 (18 %) most frequent and 8 (6 %) occurring only once, lateral margin with 2 RS (100 %); exopod mesial margin with 4 RS (100 %), lateral margin with 5 RS (100 %). Size. Adult males (n = 10) 6.5 – 8.3 mm (mean 7.7 mm); females (n = 7) 7.4 – 8.5 mm (mean 8.0 mm).	en	Rodcharoen, Eknarin, Bruce, Niel L. (2021): Two new species of the marine isopod genus Cirolana Leach, 1818 (Crustacea Isopoda: Cirolanidae) from the coast of the western Gulf of Thailand. Zootaxa 4950 (3): 469-486, DOI: 10.11646/zootaxa.4950.3.3
A02387D80055FFD7FF56FB4DFCC5EC63.taxon	discussion	Remarks. Cirolana khamensis sp. nov. is characterized by pereonites 1 – 3 each with a single transverse impressed line; pereonites 4 – 6 with each with two transverse impressed lines; pereonite 7 with three transverse lines with the posterior line forming a nodulose ridge; the antennula peduncular articles 1 and 2 are distinct and articulated; pleotelson dorsal surface with two sub-median longitudinal carinae, each of which has four prominent tubercles, posterior margin evenly rounded, with eight robust setae; pereopod 1 merus inferior margin with six molariform RS; lateral margin of uropodal exopod having continuous row of PMS; and penes in the form of two low tubercles separated by 25 % of sternal width. We place Cirolana khamensis into the Cirolana ‘ pleonastica - group’ as the species shows all the characters for that group, with the exception of the uropodal exopod lateral margin, which has setae along the distal two-thirds of its length, though not the entire length. Nonetheless, the morphology and setation of the uropodal exopod is closer to that of the Cirolana ‘ pleonastica - group’ than to the other clades, and furthermore C. khamensis lacks the defining characters of the other groups (see Sidabalok 2019). In their diagnosis of the ‘ pleonastica - group’, Sidabalok & Bruce (2018 a) state the uropod exopod lateral margin character is usually present. Similar South-East Asian species in the Cirolana ‘ pleonastica - group’ are Cirolana phuketensis Rodcharoen et al., 2017 (Thailand), C. merlion Sidabalok & Bruce, 2018 (Singapore), C. fasfes Sidabalok & Bruce 2018 (Indonesia) (Sidabalok & Bruce 2018 a). However, the new species can be distinguished from those species by lateral margin of uropodal exopod having a more continuous row of PMS (vs uropodal exopod lateral margin with widelyspaced and acute robust setae). Moreover, C. khamensis sp. nov. can be separated from the allopatric species C. bruscai Bruce & Olesen, 2002 by the head not being produced and overriding the antennular bases; and the inferior margins of pereopods 6 and 7 are smooth (vs head weakly produced and overriding the antennular bases; inferior margins of pereopods 6 and 7 serrate in C. bruscai).	en	Rodcharoen, Eknarin, Bruce, Niel L. (2021): Two new species of the marine isopod genus Cirolana Leach, 1818 (Crustacea Isopoda: Cirolanidae) from the coast of the western Gulf of Thailand. Zootaxa 4950 (3): 469-486, DOI: 10.11646/zootaxa.4950.3.3
A02387D80055FFD7FF56FB4DFCC5EC63.taxon	etymology	Etymology. The epithet is taken from the type locality.	en	Rodcharoen, Eknarin, Bruce, Niel L. (2021): Two new species of the marine isopod genus Cirolana Leach, 1818 (Crustacea Isopoda: Cirolanidae) from the coast of the western Gulf of Thailand. Zootaxa 4950 (3): 469-486, DOI: 10.11646/zootaxa.4950.3.3
A02387D8005DFFD5FF56FF15FDB3EA77.taxon	description	(Figs 8 – 11)	en	Rodcharoen, Eknarin, Bruce, Niel L. (2021): Two new species of the marine isopod genus Cirolana Leach, 1818 (Crustacea Isopoda: Cirolanidae) from the coast of the western Gulf of Thailand. Zootaxa 4950 (3): 469-486, DOI: 10.11646/zootaxa.4950.3.3
A02387D8005DFFD5FF56FF15FDB3EA77.taxon	materials_examined	Material examined. Holotype: ♂ (4.6 mm), Patiew, Chumphon province, 10 ° 43 ’ 11 ” N, 99 ° 51 ’ 23 ” E, 22 June 2014, trapped in 1 m of depth, seaweed associated with coral rubble, coll. E. Rodcharoen (PSUZC-CR 2088 - 01). Paratypes: 15 ♂ (4.8, 4.9, 4.8, 4.8, 4.8, 5.1, 4.9, 5.3, 4.9, 5.0, 4.2, 4.6, 5.0, 5.3, 4.5 mm [dissected]), 6 ♀ (4.9, 5.5, 5.0, 5.4, 4.8, 4.9 mm [dissected]), same data as holotype, (PSUZC-CR 2088 - 02); 11 ♂ (5.1, 4.7, 4.6, 4.8, 4.4, 4.4, 4.5, 5.0, 4.7, 5.0, 4.6 mm [dissected]), 4 ♀ (4.5, 4.7, 5.0, 4.0 mm [dissected]), Samae San, Chonburi province, 12 ° 36 ’ 21 ” N, 100 ° 57 ’ 51 ” E, 30 July 2012, coral reef, coll. E. Rodcharoen (PSUZC-CR 2088 - 03).	en	Rodcharoen, Eknarin, Bruce, Niel L. (2021): Two new species of the marine isopod genus Cirolana Leach, 1818 (Crustacea Isopoda: Cirolanidae) from the coast of the western Gulf of Thailand. Zootaxa 4950 (3): 469-486, DOI: 10.11646/zootaxa.4950.3.3
A02387D8005DFFD5FF56FF15FDB3EA77.taxon	description	Description of male. Body 2.6 times as long as greatest width, dorsal surfaces punctuate, widest at pereonite 5, lateral margins subparallel. Rostral point absent. Eyes colour black, separated by about 58 % width of head. Pereonites 1 – 3 without each without transverse impressed line; pereonites 4 – 6 with each 2 transverse impressed lines; pereonite 7 with 3 tranverse lines with single row of nodules forming nodulose ridge. Pereonite 1 and coxae 2 – 3 each with posteroventral angle rounded; coxae 5 – 7 with entire oblique carina; posterior margins of pereonites 5 – 7 smooth. Pleon with pleonite 1 largely concealed by pereonite 7; posterolateral angles of pleonite 2 forming acute point, extending posteriorly to anterior of pleonite 4; pleonite 3 with row of 5 – 7 small tubercles, posterolateral margins acute, extending clearly beyond posterior margin of pleonite 5; pleonite 4 with median tubercle and 4 indistinct sublateral tubercules on each side, posterolateral margin of pleonite 4 rounded, clearly extending beyond posterior margin of pleonite 5; pleonite 5 with prominent elongate median tubercle and 3 – 4 small sublateral tubercule on each side, posterolateral angles overlapped by lateral margins of pleonite 4. Pleotelson dorsal surface with 2 tubercles and paired submedian longitudinal carina, lateral margins straight, margins smooth, posterior margin sub-truncate, with 6 robust setae. Antennula peduncle articles 1 and 2 entirely fused; article 3 and 4 0.6 times as long as combined lengths of articles 1 and 2, article 3 1.4 times as long as wide; flagellum with 6 articles, extending to posterior margin of eye. Antenna peduncle article 4 1.8 times as long as wide, 1.7 times as long as article 3, inferodistal angel with 1 short simple seta; article 5 1 times as long as article 4, 2.1 times as long as wide, inferodistal angle with 1 pappose seta, anterodistal angle with cluster of 4 short simple setae and 2 plumose setae; flagellum with 17 articles, extending to posterior of pereonite 3. Frontal lamina pentagonal, ventral surface entirely flat, 1.9 times as longer than greatest width, lateral margins weakly concave, anterior margin acute. Left mandible molar process anterior margin with about 15 flat teeth; with about 5 proximal cluster of long simple setae; left mandible spine row composed of about 6 spines; palp articles 2 with about 15 distolateral setae, palp article 3 with about 16 biserrate RS. Right maxillula mesial lobe with 3 large and circumplumose RS; lateral lobe with 12 RS. Right maxilla lateral lobe with 4 long setae; middle lobe with 10 long setae; mesial lobe with 13 long setae. Right maxilliped palp article 1 mesial margin with 1 slender seta; article 2 mesial margin with 4 slender setae, lateral margin distally with 1 slender setae; article 3 mesial margin with 11 slender setae, lateral margin with 4 slender setae; article 4 mesial margin with 9 slender setae, lateral margin with 3 slender setae, article 5 distal margin 14 setae, lateral margin with 4 setae; endite with 4 long CPS, and 1 coupling setae. Pereopod 1 basis 2.8 times as long as greatest width, inferior distal angle with cluster of 2 acute setae; ischium 0.4 times as long as basis, inferior margin with 2 setae, superior distal margin with 2 RS; merus inferior margin with 5 molariform RS (set in rows of 3 and 2), superior distal angle with 2 setae (slender); carpus inferior margin with 1 RS (plus 1 slender seta); propodus 1.9 times as long as wide, inferior margin with 2 RS; dactylus 0.7 times as long as propodus. Pereopod 2 ischium inferior margin with 2 stout, bluntly rounded RS, superior distal margin with 2 RS; merus inferior margin with 7 stout RS (set as single row of 4 and 3), superior distal margin with 3 acute RS; carpus inferodistal angle with 2 RS (plus 1 slender seta); propodus 2.3 times as long as wide, dactylus 0.8 times as long as propodus. Pereopod 3 similar to pereopod 2. Pereopod 4 intermediate in form between pereopod 3 and pereopod 5. Pereopod 6 similar to pereopod 7. Pereopod 7 basis 2.3 times as long as greatest width, superior margin convex, inferior margin with 3 palmate setae; ischium 1.7 times as long as basis, inferior margin with 5 RS (set in groups of 2 and 3), superior distal angle with 5 RS (3 simple and 2 serrate), inferior distal angle with 2 RS; merus 0.8 times as long as ischium, 1.2 times as long as wide, inferior margin with 3 RS, superior distal angle with 8 RS, inferior distal angle with 6 RS; carpus 0.8 times as long as ischium, 2.3 times as long as wide, inferior margin with 2 RS, superior distal angle with about 11 RS (3 simple and about 8 serrate), inferior distal angle with 7 RS (5 simple and 2 serrate); propodus 0.9 times as long as ischium, 4.1 times as long as wide, inferior margin with 3 clusters of RS (set in group 1 and 2), superior distal angle with 2 slender setae, inferior distal angle with 2 robust setae; dactylus 0.5 times as long as propodus. Penes two low tubercles, penial openings separated by 13 % of sternal width. Pleopod 1 exopod 1.3 times as long as wide, lateral margin straight, distally broadly rounded, mesial margin strongly convex, with 25 PMS from distal one-third; endopod 2.1 times as long as wide, distally broadly rounded, lateral margin convex, with 10 PMS on distal margin only; peduncle 1.6 times as wide as long, mesial margin with 4 coupling hooks. Pleopod 2 exopod with 31 PMS, endopod with 12 PMS; appendix masculina with parallel margins, 1.1 times as long as endopod, distally acute. Pleopod 3 exopod with 36 PMS, endopod with 9 PMS. Pleopod 4 exopod with 38 PMS, endopod with 9 PMS. Pleopod 5 exopod with 41 PMS. Pleopods 2 – 5 peduncle distolateral margin with prominent acute RS. Uropod peduncle ventrolateral margin with 2 RS, lateral margin with 1 medial short acute RS, posterior lobe about one-half as long as endopod; rami extending beyond pleotelson. Endopod apically not bifid; lateral margin distally convex, with 1 RS, mesial margin strongly convex, with 5 RS. Exopod extending beyond end of endopod, 3.1 times as long as greatest width, apically shallowly and equally bifid; lateral margin weakly convex, with 5 RS; mesial margin straight, distally convex, with 4 RS, dorsal distal surface with patch of stiff setae. Female. Of similar appearance to male but low tubercles on pleon and pleotelson and the uropodal exopod lacking the dorsal distal patch of setae. Variation. Pleotelson (n = 37 [27 ♂ and 10 ♀]) with 5 – 7 RS, with 6 RS (3 + 3) most frequent (94 %), 5 (3 %) and 7 (3 %) occurring only once. Uropod endopod mesial margin with 5 – 6 RS, with 5 (97 %) most frequent, 6 (3 %) occurring only once, lateral margin with 1 RS (100 %); exopod mesial margin with 2 – 4 RS, with 3 (57 %), 4 (42 %) and 2 (3 %) occurring only once, lateral margin with 5 – 6, with 5 (87 %) most frequent and 6 (13 %). Size. Adult males (n = 27) 4.2 – 5.3 mm (mean 4.8 mm); females (n = 10) 4.0 – 5.5 mm (mean 4.8 mm).	en	Rodcharoen, Eknarin, Bruce, Niel L. (2021): Two new species of the marine isopod genus Cirolana Leach, 1818 (Crustacea Isopoda: Cirolanidae) from the coast of the western Gulf of Thailand. Zootaxa 4950 (3): 469-486, DOI: 10.11646/zootaxa.4950.3.3
A02387D8005DFFD5FF56FF15FDB3EA77.taxon	discussion	Remarks: Cirolana parawongat sp. nov. is characterized by pereonites 1 – 3 without a transverse impressed line; pereonites 4 – 6 with each with two transverse impressed lines; pereonite 7 with three tranverse lines with a single row of posterior line forming nodulose ridge; antennula peduncular articles 1 and 2 fused; frontal lamina pentagonal, 1.9 times as longer than greatest width; pleotelson dorsal surface with two tubercles and paired submedian longitudinal carina, with a sub-truncate posterior margin, provided with six robust setae; the dorsal distal surface of the male uropodal exopod has patch of stiff setae; and the penes are in the form of two low tubercles, penial openings separated by 13 % of sternal width. This species can be distinguished from the sympatric C. khamensis sp. nov. by the body length, which is shorter than that of C. khamensis (average 4.8 mm both in male and female vs average 7.7 mm in male, 8.0 mm in female in C. khamensis); pereonites 1 – 3 without a single transverse impressed line (vs only pereonites 1 without transverse line); antennula peduncle with articles 1 and 2 fused (vs antennula peduncle with articles 1 and 2 distinct articulated); frontal lamina pentagonal, 1.9 times as longer than greatest width (vs 2.2 times as longer than greatest width); pleotelson dorsal surface with two tubercles and paired submedian longitudinal carina, posterior margin sub-truncate, with six robust setae (vs pletelson dorsal surface with four and paired submedian logitudinal carina, posterior margin evenly rounded, with eight robust setae); dorsal distal surface of uropod exopod with patch of stiff setae (vs without patch of stiff setae on uropod exopod); penes in the form of two low tubercles, penial openings separated by 13 % sternal width (vs penial openings separated by 25 % sternal width) Cirolana parawongat sp. nov. is most similar to C. wongat Bruce, 1994 (Papua New Guinea) with the male of both species having similar pattern of setal patch on uropodal exopod dorsal distolateral surface. However, the two species can be separated the following characters: Cirolana parawongat sp. nov. has pereonites 2 – 3 without transverse impressed line (vs pereonites 2 – 3 with each a single transverse impressed line in C. wongat); the frontal lamina is shorter than C. wongat (2.0 vs 3.0 times as long as basal width). Moreover, C. parawongat sp. nov. has pleonite 4 posterior margin not medially indented (vs pleonite 4 posterior margin medially indented) and has more tubercles on pleonite 4 and 5 than C. wongat sp. nov. (nine vs five tubercles).	en	Rodcharoen, Eknarin, Bruce, Niel L. (2021): Two new species of the marine isopod genus Cirolana Leach, 1818 (Crustacea Isopoda: Cirolanidae) from the coast of the western Gulf of Thailand. Zootaxa 4950 (3): 469-486, DOI: 10.11646/zootaxa.4950.3.3
A02387D8005DFFD5FF56FF15FDB3EA77.taxon	etymology	Etymology. The specific name refers to the most similarity of the new species to C. wongat Bruce, 1986, which was described from Papua New Guinea.	en	Rodcharoen, Eknarin, Bruce, Niel L. (2021): Two new species of the marine isopod genus Cirolana Leach, 1818 (Crustacea Isopoda: Cirolanidae) from the coast of the western Gulf of Thailand. Zootaxa 4950 (3): 469-486, DOI: 10.11646/zootaxa.4950.3.3
