Kapalana durraween, Berents & Lowry, 2018

Berents, Penelope B. & Lowry, J. K., 2018, The New Crustacean Amphipod Genus Kapalana from Australian Waters (Senticaudata, Ischyroceridae, Ischyrocerinae, Cerapodini), Records of the Australian Museum 70 (4), pp. 391-421: 397-398

publication ID

http://doi.org/ 10.3853/j.2201-4349.70.2018.1711

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scientific name

Kapalana durraween

sp. nov.

Kapalana durraween   sp. nov.

Figs 4–6 View Figure 4 View Figure 5 View Figure 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 GoogleMaps   . 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 GoogleMaps   ; 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 GoogleMaps   .

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 GoogleMaps   ; 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 GoogleMaps   ; 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 GoogleMaps   .

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.

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.


Australian Museum