The New Crustacean Amphipod Genus Kapalana from Australian Waters (Senticaudata, Ischyroceridae, Ischyrocerinae, Cerapodini) Author Berents, Penelope B. Author Lowry, J. K. text Records of the Australian Museum 2018 2018-09-26 70 4 391 421 http://dx.doi.org/10.3853/j.2201-4349.70.2018.1711 journal article 10.3853/j.2201-4349.70.2018.1711 2201-4349 5237503 F0306801-9E69-4BEA-A543-CD187EA33C57 Kapalana durraween sp. nov. Figs 4–6 Holotype , male, 9.4 mm , AM P.21868, off Disaster BaY , New South Wales , Australia ( 37°16'S 150°5'E ), 91 m , K. Moller , May 1930 . Paratypes : 1 male , 6.9 mm , AM P.10721, off Twofold Bay , New South Wales , Australia ( 37°5'S 150°9'E ), 82 m , K. Moller on Durraween , August 1929 ; 1 male , 8.2 mm , AM P.76108 ; 1 female , 7.0 mm, AM P.76109 ; 4 males , 1 female , AM P.10719, off Twofold BaY , New South Wales , Australia ( 37°5'S 150°7'E ), 82 m , K. Moller on Durraween , July 1929 . Additional material examined . 10 specimens , AM P.21867, 35 km east of Port Jackson , New South Wales , Australia ( 33°50'S 151°40'E ), 366 m , 27 March 1905 ; 1 female , AM P.10720, west-south-west of Gabo Island , Victoria , Australia ( 37°34'S 149°55'E ), 128 m , K. Moller on Durraween , December 1929 ; 1 female , 2 juveniles , AM P.76107, off Disaster Bay , New South Wales , Australia ( 37°16'S 150°5'E ), 91 m K. Moller , May 1930 . Etymology . Named for the trawler Durraween , whose Master, Captain K. Moller, contributed many natural history specimens to the Australian Museum. Used as a noun in apposition. Description . Based on Holotype , male 9.4 mm ,AM P.21868. Head . Rostrum long, length 0.3 × head, evenly tapered, apically acute; lateral cephalic lobe with ventral corner rounded, subocular margin deeply recessed, reaching beyond eye, anteroventral corner rounded, ventral margin horizontal, posterior margin sloping. Antenna 1 very long, length 0.8 × body length; peduncle with scales; peduncular article 1 shorter than article 3, length 0.7 × peduncular article 3, not produced anterodistally and anteromedially, with strong sub-quadrate projection along posterior margin, posterodistal corner not produced; peduncular article 2 anterodistal corner with distal projection flagellum10-articulate; article 1 short. Antenna 2 length equal to antenna 1; flagellum 9-articulate. Epistome and upper lip fused, produced, broad base, apically acute. Pereon . Pereonite 1 with lateral keel, without sternal keel. Pereonites 2–3 with sternal keel. Pereonite 5 length 1.4 × depth. Gnathopod 1 subchelate; coxa not fused to pereonite 1, without anteroventral lobe; basis length 2.1 × depth; carpus broad, length 1.5 × depth with setose posterior lobe, propodus palm acute, robust setae absent. Gnathopod 2 carpochelate; coxa not fused to pereonite 2, length 1.6 × depth, without anteroventral lobe or cusp; basis short, broad, length 1.4 × breadth, basis without anteroproximal group of long slender setae, basis without anteroproximal bulge; carpus long, length 1.2 × breadth, broad, palm shallowly excavate, anterodistal tooth large, located near articulation with propodus, posterodistal tooth well defined, medium length, length 1.2 × width; propodus broad, curved, length 4.5 × width, without tooth on posterior margin, posterodistal corner smooth, without spines; dactylus length 0.4 × propodus. Pereopod 3 coxa not fused to pereonite 3, with broad anteroventral lobe, length 1.9 × depth; basis, length 1.9 × breadth, with proximal, subquadrate anterodorsal corner, with plumose setal group and simple setae along anterior margin, without denticles along anterior margin; ischium long, length 2 × breadth; merus length 1.1 × breadth; short; without ridges. Pereopod 4 coxa not fused to pereonite 4, length 2.1 × depth, with anteroventral lobe; basis length 1.7 × breadth, with plumose setal group midway along anterior margin or with simple setae along entire anterior margin; ischium long, length 2.5 × breadth; merus long, length 1.4 × breadth. Pereopod 5 coxa length 1.2 × depth, without patches of small setae, with setae along ventral margin few or absent; merus with anterior lobe extending beyond anterior margin of carpus, posterior lobe with 6 plumose setae; propodus with 4 setae along posterior margin; dactylus short, uncinate with 2 accessory hooks. Pereopod 6 coxa with setal fringe ventrally, without patches of small setae near margins; basis without patch of small setae near anterior margin; merus length 1.6 × breadth; dactylus short, uncinate, with 2 accessory hooks. Pereopod 7 coxa without posterodorsal lobe; merus length 2.1 × breadth; dactylus short, uncinate, with 2 accessory hooks. Pleon . Pleopods 1–3 biramous, decreasing in size anteroposteriorly. Pleopod 1 inner ramus 9-articulate; outer ramus 9-articulate, article 1 evenly swollen. Pleopod 2 inner ramus reduced, 1-articulate; outer ramus, broad, 1-articulate. Pleopod 3 inner ramus reduced, 1-articulate; outer ramus broad, 1-articulate. Uropod 1 biramous; peduncle, length 1.4 × outer ramus; rami with distoventral fan of robust setae; outer ramus with lateral row of denticles, without medial setae, with 14 lateral setae, with large apical robust seta and smaller slender setae; inner ramus length 0.5 × outer ramus, with 1 medial, and 3 lateral setae, without large apical robust seta. Uropod 2 uniramous, peduncle, length 2.8 × breadth, 4.4 × length of ramus; ramus small with 7 denticles and 1 slender apical seta. Uropod 3 uniramous, peduncle length 1.5 × breadth; ramus with 2 curved hooks. Telson length 0.6 × breadth, moderately cleft (58%), each lobe with 26–30 anteriorly directed hooks in 2 rows. Female (sexually dimorphic characters). Based on paratype female 7.0 mm, AM P.76109. Antenna 1 flagellum 9-articulate. Pereonite 1 without lateral keel. Pereonites 2–3 without sternal keel. Pereonite 5, length 1.9 × depth. Gnathopod 1 coxa, length 1.1 × depth; basis, length 2 × depth; carpus length 1.3 × depth with setose posterior lobe. Gnathopod 2 subchelate; coxa, length 1.7 × depth; basis, length 2.2 × breadth. Pereopod 5, coxa, length 1.4 × depth. Oostegites from gnathopod 2 to pereopod 5. Tube . Tubes of juveniles attached in a ring, circling the tube of adult female. Habitat . Continental shelf and slope ( 82–366 m depth). Remarks . The shape of gnathopod 2 propodus and carpus changes as males grow, with the carpus becoming longer than wide and the propodus becoming curved and slender in large males. In males less than 7 mm , the length and breadth of the carpus are equal and the propodus is less than three times as long as wide Three species, K. amelga , K. durraween and K. maia , have an evenly tapered rostrum. Neither Kapalana durraween nor K. maia have a large apical seta on the inner ramus of uropod 1. Kapalana durraween differs from K. maia in having scales on the peduncle of antenna 1, a lateral keel on pereonite 1 and a sternal keel on pereonite 3. Figure 4 . Kapalana durraween sp. nov. , AM P.21867, central maternal tube with encircling juvenile tubes, 35 km east of Port Jackson, New South Wales , Australia (diameter of central tube = 2mm ). Distribution . Australia . New South Wales : east of Port Jackson; off Twofold BaY; off Disaster BaY. Victoria : west south west of Gabo Island.