taxonID	type	description	language	source
03D7642C697CFF813052FB402BDAF889.taxon	materials_examined	Type species: Haploniscus dimeroceras Barnard, 1920; by original designation. Diagnosis Head with strongly prolonged pyramidal clypeus. Pereonites 5 – 7 fused with pleotelson, suture lines between pereonites usually visible, suture line between pereonite 7 and pleotelson sometimes indistinct or absent medially. Antenna article 1 small, concealed by article 2; article 3 longer than wide, with longitudinal groove or suture; articles 5 and 6 fused, suture visible, article 6 with terminal projection; flagellum small and slender, inserting subapically on peduncular article 6. Pleopod 1 with spine row near distal end of transverse groove. Pleopod 2 endopod short, stout, not or only slightly exceeding terminal margin of protopod. Remarks	en	Brökeland, Wiebke (2006): Three species of the isopod crustacean genus Antennuloniscus Menzies, 1962 (Asellota: Haploniscidae) from the Southern Ocean. Zootaxa 1115: 1-29, DOI: 10.5281/zenodo.171605
03D7642C697CFF813052FB402BDAF889.taxon	description	Menzies and Schultz (1968) do not discuss the presence of an ‘ intersex’ specimen in their material of A. subellipticus, but this specimen is probably not an ‘ intermediate’ specimen as described by Wolff (1962: 212). According to the illustration given by the authors pleopod 2 of this individual has very few distal setae unlike the female operculum. Therefore it is probably a stage IV or IVa male (stages after Wolff 1962). Sparsely setose pleopods 2 can be observed in other juvenile males of the Haploniscidae as well.	en	Brökeland, Wiebke (2006): Three species of the isopod crustacean genus Antennuloniscus Menzies, 1962 (Asellota: Haploniscidae) from the Southern Ocean. Zootaxa 1115: 1-29, DOI: 10.5281/zenodo.171605
03D7642C697EFF8F3052FC762B7DFBE9.taxon	materials_examined	Material Holotype: American Museum of Natural History, New York, AMNH 12004, ɗ, 2.0 mm, V­ 14 ­ 23, archipelagic apron of Menzies Seamount, southwest of South Georgia, eastern Scotia Sea, Atlantic, 55 ° 29 ’ S 37 ° 57 ’ W, 3770 m depth. Type in good condition, pleopod 1 dissected. ANDEEP material: Station 42 ­ 2, 59 ° 40.30 – 40.32 ’ S 57 ° 35.42 – 42.64 ’ W, 3689 m: 2 ɗ, 2.1 and 2.2 mm; 5 Ψ, 1.9 – 2.3 mm; 1 ovigerous Ψ, 2.0 mm; 1 juvenile, 1.1 mm long; ZMH K­ 40723. Station 43 ­ 8, 60 ° 27.13 – 27.19 ’ S 56 ° 05.12 – 04.81 ’ W, 3962 m depth: 1 ɗ, 2.0 mm; 1 Ψ, 1.9 mm; ZMH K­ 40724. Diagnosis Body broadly oval, length 2.0 width. Head length 2.1 width, frontal margin convex. Of pleotelson in males anterior margin width 1.8 posterior margin, posterolateral processes short, not reaching terminal margin. Antenna peduncular article 3 with small blunt dorsal tooth, longitudinal groove distinct, flagellum almost as long as articles 5 and 6, with 8 articles. Carpus of pereopods 5 – 7 with numerous long simple setae ventrally. Pleopod 1 length 1.7 times width, broadest part in the proximal fifth, greatest width 2.2 narrowest width. Pleopod 2 protopod length 1.9 width; endopod length 0.8 protopod length, sperm duct reaching from endopod tip almost to proximal third of article 2. Description of male (ANDEEP specimen) Body (Fig. 2): Margins of pereonites rounded, smooth; pereonite 5 widest. Pleotelson length 0.2 body length, tapering slightly distally; lateral margins slightly convex, serrated, with numerous setae (broken off in illustrated specimen); terminal margin with median convex extension bearing the anus; dorsal surface with 2 rounded longitudinal ridges, ventral surface with faint cuticular suture line surrounding branchial chamber. Cuticle of body, pleopods 1 and 2, maxillipedal epipod and peduncular articles of antenna with numerous small round depressions (Fig. 3 G). Antennula (Fig. 2) length 0.2 body length, article 1 broadest, about length 1.4 width, article 2 slightly shorter, about half as wide as article 1, both articles with several broom and simple setae; article 3 length 0.6 article 2 length, with simple seta; flagellum with 5 articles of subequal length; article 1 with broom seta; article 2 with 1, article 3 with 2 aesthetascs, article 4 with 3 aesthetascs and 1 simple seta, terminal article with 1 lateral and 2 apical aesthetascs, 3 simple setae and 1 short broom seta. Antenna (Fig. 4) length almost half body length, article 1 minute, concealed by article 2, article 2 about as long as wide, article 3 length 2.0 width, 1.3 article 2 length, article 4 short, length 0.5 article 3 length, fused articles 5 and 6 (not including apical tooth) length 1.2 article 3 length, with numerous simple setae, some broom setae (broken off in illustrated specimen) and apical tooth; flagellum inserting subapically, slightly shorter than fused articles 5 and 6, with 8 articles of decreasing width, each with numerous simple setae. Mandible (Fig. 5) incisor with 5 blunt teeth, lacinia mobilis of left mandible with 5 teeth, right mandible with stout serrated spine, lacinia mobilis absent, spine row comprising 2 serrated and 2 simple spines; molar tooth row with 7 teeth and 4 setulated setae proximally, cuticular ledge tapering off forming a single tooth, right mandible with row of 6 indistinct accessory teeth proximally of cuticular ledge; palp article 2 with single serrated spine­like seta proximally of insertion of article 3, article 3 with 4 serrated spinelike setae of increasing length, distal seta about 3 times as long as proximal seta. Maxillula (Fig. 5) outer lobe with 8 simple and 4 serrated spine­like setae and several simple setae on lateral and medial margin and surface; inner lobe apically with 2 short spine­like setae and several simple setae. Maxilla (Fig. 5) outer lobe with 2 long and 1 short simple spine­like setae apically and rows of simple setae on lateral margin; medial lobe with 1 long and 1 shorter serrated spine­like seta and 1 simple seta apically and 3 spine­like setae on medial margin; inner lobe with 2 apical serrated spine­like setae, 3 stout apical simple setae and numerous simple setae on surface and medial margin. Maxilliped (Fig. 4) endite apical margin with 2 small fan setae and 2 short spine­like setae, ventral surface with 1 spine­like and numerous simple setae, separated apical medial margin dorsally with 1 simple spine­like seta 1 serrated spine­like seta and row of simple setae, medial margin with 2 retinaculae; epipod slightly longer than endite. Pereopods (Fig. 6): Basis of pereopod 1 only with 1 long simple seta ventrally, basis of pereopods 2 – 4 with 1 (pereopods 2 and 3) or 2 simple setae ventrally, 1 or 2 broom setae and 1 simple seta dorsally; basis of pereopods 5 – 7 with 2 long setae ventrally and a simple seta dorsally, pereopods 5 and 6 with 3 broom setae dorsally. Ischium with short simple setae on pereopods 1 – 4 and long simple setae ventrally on pereopods 5 – 7. Merus with 4 apical setae and 1 or 2 (pereopods 6 and 7) setae ventrally. Carpus with ventral comb­like scale rows and 3 – 4 long simple setae on pereopods 1 – 4, pereopod 5 with 4 simple setae and 1 stout seta ventrally, pereopods 6 and 7 with 6 respectively 7 simple setae and 1 stout seta; pereopod 7 with dorsal stout flagellate seta; apical comb on carpus of pereopod 1 small and setose, apical combs on pereopods 2 – 7 comprised of 1 small and 1 large spinose comb, decreasing in size on pereopods 6 and 7. Propodus with ventral row of comb­like scales and 2 – 5 simple setae ventrally, pereopods 5 – 7 with spine­like seta ventrally. Dactylus with 3 lateral setae on pereopods 1 – 4 and 1 lateral seta on pereopods 5 – 7; accessory tooth acute. Pleopods (Fig. 7): Pleopod 1 lateral margins with simple seta, distal margins with about 6 setae each, sympods separated at the distal tip, ventral surface with mediolateral bulges with several bristles and 2 transverse grooves in the distal third. Pleopod 2 protopod length 1.9 width, with several simple setae in distal part; endopod inserting in distal half of protopod, short, stout; article 2 length about 2.0 article 1 length, expanding in medial part, exopod inserting in distal third of protopod. Pleopod 3 endopod length 1.3 times width, with rounded distal margin; exopod almost triangular, as wide as long, width 0.8 endopod width, length 0.5 endopod length, lateral margin rounded, with 3 simple setae and fringe of fine bristles. Pleopod 4 endopod oval, length 1.8 width; exopod length 1.8 width, 0.6 endopod length, width 0.6 endopod width, lateral margin rounded with fringe of long bristles, plumose seta slightly longer than exopod. Pleopod 5 length 2.0 width. Uropods (Fig. 2) short, stout, not reaching terminal margin. Descriptive note on female (ANDEEP specimen) The female differs from the male in the following characters: Sutures between pereonites 6 and 7 and pleotelson not distinct ventrally. Anterior margin of pleotelson (Fig. 3) 2 times as broad as posterior margin, longitudinal keels on dorsal surface less distinct, terminal margin slightly stronger produced. Antennula (Fig. 3) with 3 flagellar articles, article 2 with 1 aesthetasc, article 3 with 2 aesthetascs. Antenna (Fig. 4) more slender, flagellum with fewer setae. Mandibular palp (Fig. 5) with 3 spine­like setae on article 3. Operculum (Fig. 7) subcircular, with numerous simple setae on distal and lateral margins. Remarks The type specimen is in good condition and is intact apart from pleopod 1, which has been dissected and was found loose in the same vial. It is somewhat distorted. The type location is the eastern Scotia Sea off South Georgia and another specimen was found off Cape Horn (55 ° 31.2 ’ S, 64 ° 7.5 ’ W). The new specimens were collected at two stations in the Drake Passage off Elephant Island. All three stations have a similar depth range. The description of Menzies (1962) and Menzies and Schultz (1968) are not detailed; examination of the holotype revealed no significant differences between the type specimen and the new material reported. Menzies (1962) stated that species most closely related to A. ornatus might be A. dimeroceras Barnard, 1920, basing this only on the fact that both species are known from the South Atlantic; Menzies and Schultz (1986) also followed that view. A morphological comparison of the two species does not support this view. A. ornatus differs from the other species in the genus in having a broadly oval body. The pleotelson is similar to those of A. armatus and A. subellipticus Menzies and Schultz (1986), but broader and less tapering. Whether the slight projection of the frontal margin of the head should be described as convex or bearing a rostral process is difficult to decide. The process is less distinct than in A. armatus, A. diversu s Lincoln, 1985 b, A. dilatatus Chardy, 1974 and the new species described below. Therefore it was not indicated as a rostrum above.	en	Brökeland, Wiebke (2006): Three species of the isopod crustacean genus Antennuloniscus Menzies, 1962 (Asellota: Haploniscidae) from the Southern Ocean. Zootaxa 1115: 1-29, DOI: 10.5281/zenodo.171605
03D7642C6971FF963052FB002CFDFBB9.taxon	materials_examined	Material Holotype: American Museum of Natural History, New York, AMNH 11997, Ψ, 2.3 mm, V­ 14 ­ 28, western flank of Walvis Ridge, northwest of Meteor Seamount, Atlantic, 45 ° 34 ’ S 6 ° 2 ’ E, 4618 m. Type in good condition, undissected. ANDEEP material: Station 42 ­ 2, 59 ° 40.30 – 40.32 ’ S 57 ° 35.42 – 42.64 ’ W, 3689 m: 7 subadult ɗ, 2.1 – 2.5 mm; 15 Ψ, 2.0 – 2.3 mm; 6 ovigerous Ψ, 2.3 – 2.5 mm; ZMH K­ 40725. Station 43 ­ 8, 60 ° 27.13 – 27.19 ’ S 56 ° 05.12 – 04.81 ’ W, 3962 m: 2 Ψ, 2.1 – 2.2 mm; 1 ovigerous Ψ, 2.4 mm; ZMH K­ 40726. Diagnosis Body oval, length 2.5 width. Head length 2.3 width, frontal margin slightly concave, medially with acute frontodorsally directed triangular rostrum. Pleotelson in subadult males anterior margin width 2.0 posterior margin, posterolateral processes short, but exceeding terminal margin. Antenna peduncular article 3 with small, blunt dorsal tooth, longitudinal groove distinct, flagellum almost as long as articles 5 and 6, with 8 articles. Long simple setae ventrally on carpus of pereopods 1 – 4, moderately long simple setae ventrally on carpus of pereopods 5 – 7. Pleopod 1 of subadult males length 1.8 width, broadest part in the proximal quarter, greatest width 2.3 narrowest width. Pleopod 2 protopod length 1.8 width; endopod length 0.9 protopod length in subadult males. Description of subadult male (ANDEEP specimen) Body (Fig. 8): Margins of pereonites rounded, smooth; pereonite 4 broadest. Pleotelson 0.2 times as long as body, tapering distally; lateral margins slightly convex, serrated, with numerous setae (broken off in illustrated specimen); terminal margin with median convex extension bearing the anus; dorsal surface with 2 rounded longitudinal ridges, ventral surface with cuticular suture line surrounding the branchial chamber. Cuticle of body, pleopods 1 and 2, maxillipedal epipod and peduncular articles of antenna with numerous small round depressions. Antennula (Fig. 10) length 0.3 body length, article 1 broadest, about length 1.3 width, article 2 length 0.8 article 1 length, width 0.5 article 1 width, both articles with several broom setae; article 3 length 0.6 article 2 length, with simple seta; flagellum with 5 articles; article 1 shortest, with broom seta; articles 3 and 4 with 1 aesthetasc each, article 4 with 1 simple seta, terminal article longest, with 2 apical aesthetascs, 3 simple setae and 1 short broom seta. Antenna (Fig. 10) length 0.5 body length, article 1 minute, concealed by article 2, article 2 length 1.2 width, article 3 length 1.9 width, 1.5 article 2 length, article 4 short, length 0.5 article 3 length, fused articles 5 and 6 (not including apical tooth) length 1.1 article 3 length, with numerous simple setae and apical tooth; flagellum inserting subapically, slightly shorter than fused articles 5 and 6, with 8 articles of decreasing width, each with numerous simple setae. Mandible (Fig. 11) incisor with 5 blunt teeth, left mandible lacinia mobilis with 5 teeth, right mandible with stout serrated spine, lacinia mobilis absent, spine row comprising 2 serrated and 2 simple spines; molar tooth row with 6 teeth and 4 setulated setae proximally, cuticular ledge ending in a tooth on both sides, right mandible with cuticular ledge forming several blunt teeth and row of 4 blunt accessory teeth proximally; palp article 2 with 1 short and 1 longer serrated spine­like seta proximal of insertion of article 3, article 3 with 5 serrated spine­like setae of increasing length, distal seta about 4 times as long as proximal. Maxillula (Fig. 10) outer lobe with 10 simple and 3 serrated spine­like setae and several simple setae on lateral and medial margin and surface; inner lobe apically with short spine­like seta and several simple setae. Maxilla (Fig. 9) outer lobe with 2 long and 1 short simple spine­like setae apically and rows of simple setae on lateral and medial margin; medial lobe with 1 long simple and 1 shorter serrated spine­like seta and 1 simple seta apically and 3 spine­like setae on medial margin; inner lobe with 2 apical serrated spine­like setae, 3 stout apical simple setae and numerous simple setae on surface and margins. Maxilliped (Fig. 11) endite apical margin with 2 small fan setae and 2 short spine­like setae, ventral surface with 1 spine­like and numerous simple setae, separated apical medial margin dorsally with 1 small and 1 larger serrated spine­like seta and row of simple setae, medial margin with 2 retinaculae; epipod slightly longer than endite. Pereopods (Fig. 12): Basis of pereopods 1 – 3 only with 1, of pereopods 4 – 7 with 2 long simple setae ventrally; pereopods 2 – 5 with 2, pereopod 6 with 3 and pereopod 7 with 1 broom seta dorsally (some broken off in illustrated specimen); all pereopods with 1 simple seta dorsally. Ischium with short simple setae on pereopods 1 – 4 and long simple setae ventrally on pereopods 5 – 7. Merus with 4 apical and 1 ventral seta. Carpus with ventral comb­like scale rows slightly reduced on pereopods 5 – 7; ventrally 2 – 3 long simple setae on pereopods 1 – 4, on pereopods 5 – 7 1 simple seta and 2 stout setulated setae; pereopod 7 with dorsal stout flagellate seta; apical comb on carpus of pereopod 1 small and setose, apical combs on pereopods 2 – 7 composed of 1 small and 1 large spinose comb, on pereopods 5 – 7 both combs of subequal size, on pereopods 6 and 7 small. Propodus ventrally with row of comb­like scales and 3 – 4 simple setae on pereopods 1 – 4, on pereopods 5 – 7 with 2 simple and 1 spine­like seta ventrally. Dactylus with 3 lateral setae on pereopods 1 – 4 and 1 lateral seta on pereopod 5; accessory tooth acute. Pleopods (Fig. 13): Pleopod 1 distal margins with about 5 setae each, ventral surface with mediolateral bulges. Pleopod 2 with several simple setae in distal part; endopod inserting in distal half of protopod, short, stout, article 2 length 1.7 article 1 length, slender, sperm duct not developed; exopod small, inserting close to endopod. Pleopod 3 endopod length 1.6 width, with rounded lateral and distal margins; exopod almost triangular, width 1.3 length, 0.8 endopod width, length 0.5 endopod length, lateral margin rounded, with 4 simple setae and fringe of fine bristles. Pleopod 4 endopod length 1.8 width; exopod length 2.3 width, 0.5 endopod length, width 0.4 endopod width, lateral margin rounded with fringe of long bristles in the distal half, plumose seta slightly longer than exopod. Pleopod 5 length 1.6 width. Uropods (Fig. 8) short, stout, extending beyond terminal margin, not reaching tips of posterolateral projections of pleotelson. Descriptive note on female (ANDEEP specimen) The female differs from the male in the following characters: Suture between pereonite 7 and pleotelson not distinct ventrally. Anterior margin of pleotelson (Fig. 9) 2.3 times as broad as posterior margin, longitudinal keels on dorsal surface less distinct, terminal margin slightly stronger produced. Antennula (Fig. 10) with 3 flagellar articles, article 2 with 1 aesthetasc, article 3 with 2 aesthetascs. Antenna (Fig. 10) more slender, flagellum with fewer setae. Mandibular palp (Fig. 11) with 4 spine­like setae on article 3. Operculum (Fig. 13) subcircular, with numerous simple setae on distal and lateral margins. Remarks The type location is the Walvis Ridge, off Southern Africa, and the paratypes are from off the Cape of Good Hope (45 ° 34 ’ S 6 ° 2 ’ E, 41 ° 3 ’ S 7 ° 49 ’ E) (Menzies 1962). The ANDEEP specimens were found at two stations in the Drake Passage. Despite the long distance, the specimens are alike in all characters observed in Menzies’ (1962) undissected holotype and therefore the ANDEEP specimens are confirmed as A. armatus. The figures given by Menzies (1962) and Menzies and Schultz (1986) are not detailed, but it seems that the illustrated male specimen is not fully mature, as is also true for all males found during ANDEEP. Within the Haploniscidae subadult males differ from the fully mature males mainly in the antennae and pleopods 1 and 2. The antennula has fewer aesthetascs, and the flagellar articles of the antenna are less setose in subadult males. Pleopods 1 and 2 are not fully developed, and the tip of pleopod 1 has a very simple structure, which lacks the transverse grooves. The endopod of pleopod 2 is simple, article 2 is slender and not expanded, and the sperm duct is not developed. This means that several diagnostic characters can not be observed for this species. This leaves the following characters, which are important for the identification: the habitus, the rostrum, the shape of the pleotelson and the setation of the pereopods, which have previously been disregarded in most species descriptions of Haploniscidae. Menzies (1962) stated that A. armatus was closely related to A. rostratus Menzies, 1962. Menzies and Schultz (1968) transferred A. rostratus to Haploniscus, these authors then postulating a relationship between A. subellipticus and A. armatus, based mainly on the proportions of the antennae of the females and the apex of the first male pleopods. However, the proportions of the antennae are similar in many species of the genus, while the two pleopods 1 cannot be compared due to the fact that the male specimen of A. subellipticus is fully mature, having a completely developed pleopod 1, which is quite unlike the premature pleopod 1 of the A. armatus males.	en	Brökeland, Wiebke (2006): Three species of the isopod crustacean genus Antennuloniscus Menzies, 1962 (Asellota: Haploniscidae) from the Southern Ocean. Zootaxa 1115: 1-29, DOI: 10.5281/zenodo.171605
03D7642C6968FF983052FB502B10F999.taxon	materials_examined	Material Holotype: Ψ, 1.6 mm; station 134 ­ 3, 65 ° 19.20 – 19.05 ’ S 48 ° 03.77 – 02.92 ’ W, 4069 m; ZMH K­ 40727. Paratypes: same locality as holotype: 1 female, 1.7 mm, ZMH K­ 40728. Station 131 ­ 3, 65 ° 19.83 – 19.99 ’ S 51 ° 31.61 – 31.23 ’ W, 3053 m: 4 ΨΨ 1.3 – 1.8 mm; 1 ovigerous Ψ, 1.4 mm; ZMH K­ 40729. Diagnosis Body almost oblong, length 2.6 width, all pereonites with similar width. Head width 1.6 length, frontal margin slightly concave with medial rostral process. Broad, tapering, rostral process bent ventrally, with rounded apex. Pleotelson in females anterior margin width 1.7 posterior margin ¸ posterolateral processes slender, acute, not reaching terminal margin. Antennula with 3 flagellar articles in females. Antenna peduncular article 3 with relatively large dorsal tooth, longitudinal groove distinct, flagellum almost as long as articles 5 and 6, with 8 articles. Carpus of pereopods 1 – 3 with long simple setae ventrally, shorter on pereopods 4 – 7. Pleopod 2 of the female oval, wider than long. Description of paratype female Body (Fig. 14): Margins of pereonites smooth; suture between pereonite 7 and pleotelson not distinct ventrally. Pleotelson 0.3 times as long as body, tapering slightly distally, lateral margins slightly convex, weakly serrated, with 3 setae each; terminal margin convex; posterolateral processes slender, acute, not reaching terminal margin; dorsal surface with 2 indistinct short longitudinal keels, ventral surface with cuticular suture line surrounding the branchial chamber. Cuticle of body, pleopods 1 and 2, maxillipedal epipod and peduncular articles of antenna with numerous small round depressions. Antennula (Fig. 15) length 0.2 body length, article 1 broadest, length 1.5 width, article 2 slightly shorter, width 0.4 article 1 width, both articles with several broom setae; article 3 length 0.4 article 2 length, with simple seta; flagellum with 3 articles; article 1 shortest, with 2 broom setae; article 3 length 1.6 article 2 length, article 3 more than twice as long as article 1, with 2 apical aesthetascs, 3 simple setae and 1 short broom seta. Antenna (Fig. 15) length 0.4 body length, article 1 minute, concealed by article 2, article 2 about as long as wide, article 3 length 1.8 width, 1.4 article 2 length, large dorsal tooth acute, article 4 length 0.5 article 3 length, fused articles 5 and 6 (not including apical tooth) length 1.3 article 3 length, with numerous simple setae, at least 1 broom seta and long apical tooth; flagellum slightly shorter than fused articles 5 and 6, with 8 articles of decreasing width, each with several simple setae. Mandible (Fig. 15) incisor with 5 blunt teeth, left mandible lacinia mobilis with 5 teeth, right mandible with serrated spine, lacinia mobilis absent, spine row comprising 2 serrated and 3 simple spines; molar tooth row with 8 teeth and 4 setulated setae proximally, cuticular ledge tapering off forming a single blunt tooth, right mandible with row of 6 indistinct accessory teeth proximally of cuticular ledge; palp article 2 with 1 long and 1 short serrated spine­like setae proximally of insertion of article 3, article 3 with 6 serrated spine­like setae of increasing length, distal seta about 10 times as long as proximal seta. Maxillula (Fig. 16) outer lobe with 10 simple and 3 serrated spine­like setae and several simple setae on lateral and medial margin; inner lobe apically with 2 short spinelike setae and several simple setae. Maxilla (Fig. 16) outer lobe with 2 long and 1 short simple spine­like setae apically and rows of simple setae on lateral margin; medial lobe with 2 long simple spine­like setae and 1 shorter serrated spine­like seta apically and 3 spine­like setae on medial margin; inner lobe with 2 apical serrated spine­like setae, 3 stout apical simple setae and numerous simple setae on surface and margins. Maxilliped (Fig. 16) endite apical margin with 2 small fan setae and 1 short spine­like setae, ventral surface with numerous simple setae, separated apical medial margin dorsally with 1 small and 1 large serrated spine­like seta and row of simple setae, medial margin with 3 retinaculae; epipod slightly longer than endite. Pereopods (Fig. 17): Basis of pereopods 1 – 3 and 7 with 1, of pereopods 4 – 6 with 2 simple setae ventrally; dorsally with 1 simple seta, pereopods 2 – 4 with 1, pereopods 5 and 6 with 2 broom setae. Ischium with 1 short simple seta on pereopods 1 – 4 and 1 – 2 long simple setae ventrally on pereopods 5 – 7. Merus with 4 apical setae. Carpus with ventral comb­like scale rows slightly reduced on pereopods 5 – 7; carpus of pereopod 1 with 3 long simple setae ventrally, of pereopods 2 – 4 with 2 simple setae of decreasing length, carpus of pereopods 5 – 7 with 2 stout and 1 simple seta ventrally; pereopod 7 with dorsal stout flagellate seta; apical comb on carpus of pereopod 1 small and setose, apical combs on pereopods 2 – 7 comprised of 1 small and 1 large spinose comb, largest on pereopods 4 – 6. Propodus with ventral row of comb­like scales and 3 simple setae ventrally (some broken off in illustrated specimen). Dactylus with 3 lateral setae on pereopods 1 – 4 and 1 – 2 lateral setae on pereopods 5 – 7; accessory tooth acute. Pleopods (Figs 14, 16): Operculum oval, width 1.3 length, margins with several simple setae. Pleopod 3 endopod length 1.3 width, with rounded distal and lateral margin; exopod almost triangular, length 1.2 width, 0.4 endopod length, width 0.5 endopod width, lateral margin rounded, with 3 simple setae and fringe of fine bristles. Pleopod 4 endopod length 1.7 width; exopod length 1.5 width, 0.4 endopod length, width 0.4 endopod width, lateral margin rounded with fringe of long bristles. Pleopod 5 almost as wide as long. Uropods (Fig. 14) short, stout, not reaching terminal margin. Remarks This species is unique in possessing an operculum which is wider than long and, corresponding to this, pleopods 3 – 5 tend to be rather short and broad. A. latoperculus also has an unusually large tooth on article 3 of the antennula compared to that of the other species of the genus, although in other genera, like Chauliodoniscus, this tooth might be much larger. Only three species within Antennuloniscus possess a distinct rostrum: A. armatus, A. dilatatus, and A. diversus. While it is acute in A. armatus and A. diversus, only A. dilatatus has a rostrum similar to that of the new species. All three species can easily be distinguished from A. latoperculus by the shape of the pleotelson, which is rounded, with distinctly produced but small posterolateral projections in the new species.	en	Brökeland, Wiebke (2006): Three species of the isopod crustacean genus Antennuloniscus Menzies, 1962 (Asellota: Haploniscidae) from the Southern Ocean. Zootaxa 1115: 1-29, DOI: 10.5281/zenodo.171605
