Kapalana kimbla, 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 : 398-403

Kapalana kimbla sp. nov.

Figs 7 , 8

Holotype, male, 9.4 mm, MV J70496 , 26 km south-west of Cape Otway , Bass Strait, Victoria, Australia (39°01'00"S 143°22'06"E), 84 m, M. F. Gomon, 31 January 1981, MV Bass Strait Survey, BSS 120 S . Paratypes, ovigerous female, 9.6 mm, MV J70497 ; male, 6.8 mm, MV J70498 ; male, 7.4 mm, MV J70499 ; male, 5.7 mm, MV J70500 ; male, 4.6 mm, MV J70501 ; male, 3.9 mm, MV J70502 ; same data as holotype. One female, 1 male, MV J11259 , cove on south shore Leonard Point , Wilsons Promontory, Victoria, Australia, (39°01'30"S 146°17'30"E), 3 February 1982, WPNPA . One male, 1 juvenile, MV J11295 , north east end Vancouver Peninsula , Western Australia, Australia, (39°03'24"S 117°56'012"E), 7 m, 8 April 1984, SWA 18. Many specimens, AM P.99049, off Venus BaY township, Venus BaY, South Australia, Australia, (33°13'48"S 134°40'06"E), sand in channel, 3 m, G. C. B. Poore, 23 April 1985, SA 85 .

400 Records of the Australian Museum (2018) Vol. 70

Additional material examined. Many specimens, MV J11297 , type locality, M. F. Gomon, 31 January 1981, MV Bass Strait Survey, BSS 120 S .

Type locality. 26 km south-west of Cape Otway , Bass Strait, Victoria, Australia (39°01'00"S 143°22'06"E) .

Etymology. Named for HMAS Kimbla in recognition of many collections made for museums in Australia by this ship. Used as a noun in apposition.

Description. Based on Holotype, male, 9.4 mm, MV J70496 .

Head. Rostrum long, length 0.5 × head, forming a basal shoulder, apically acute; lateral cephalic lobe with ventral corner rounded, subocular margin deeply recessed, reaching beyond eye, anteroventral corner subquadrate, ventral margin horizontal, posterior margin vertical. Antenna 1 long, length 0.6 × body length; peduncle with scales; peduncular article 1 subequal to article 3, length 1.1 × 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 without distal projection; flagellum 9-articulate; article 1 short. Antenna 2 length 1.1 × antenna 1; flagellum 9-articulate.

Epistome and upper lip fused, produced, broad base, apically subquadrate.

Pereon. Pereonite 1 with lateral keel. Pereonites 1–3 with sternal keel. Pereonite 5 length 2 × depth. Gnathopod 1 coxa not fused to pereonite 1, length 1.4 × depth, without anteroventral lobe; basis length 2.2 × depth; carpus broad, length 1.4 × depth with setose posterior lobe, propodus palm acute, robust setae absent. Gnathopod 2 carpochelate; coxa not fused to pereonite 2, length 1.8 × depth, without anteroventral lobe or cusp; basis short, broad, length 1.4 × breadth, without anteroproximal group of long slender setae; carpus long, length 1.1 × breadth, broad, with smooth posterior margin; palm shallowly excavate, anterodistal tooth large, located near articulation with propodus, posterodistal tooth well defined, medium length, length equal to width; propodus slender, curved, length 4.9 × width, without tooth on posterior margin, posterodistal corner smooth with 1 tooth; dactylus length 0.4 × propodus.

Pereopod 3 coxa not fused to pereonite 3, without anteroventral lobe, length 1.6 × depth; basis, length 1.9 × breadth, with proximal rounded anterodorsal corner, with 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 2.3 × depth, with anterior lobe separated from several small anteroventral lobes; basis, length 1.6 × breadth, with simple setal group midway along anterior margin; ischium long, length 2.4 × breadth; merus long, length 1.5 × breadth. Pereopod 5 coxa, length 1.4 × depth, without patches of small setae, with setae along ventral margin few or absent; merus with anterior lobe not extending beyond anterior margin of carpus posterior lobe with 5 plumose setae; propodus with 3 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 with patch of small setae near anterior margin; merus length 1.7 × breadth; dactylus short, uncinate, with 2 accessory hooks. Pereopod 7 coxa with posterodorsal lobe, without patch of small setae; merus length 2 × breadth; dactylus short, uncinate, with 2 accessory hooks.

Pleon. Pleopods 1–3 biramous, decreasing in size anteroposteriorly. Pleopod 1 inner ramus 10-articulate; outer ramus 7-articulate, article 1 evenly swollen. Pleopod 2 inner ramus reduced, 1-articulate; outer ramus broad, 3-articulate. Pleopod 3 inner ramus reduced, 1-articulate; outer ramus broad, 1-articulate. Uropod 1 biramous; peduncle length 1.3 × outer ramus; rami with distoventral fan of robust setae; outer ramus with lateral row of denticles, without medial and lateral setae, with large apical robust seta and smaller slender setae; inner ramus, length 0.6 × outer ramus, without medial setae, with 4 lateral setae. Uropod 2 uniramous, peduncle length 2.5 × breadth, 5 × length of ramus; ramus small with 5 denticles and 1 slender apical seta. Uropod 3 uniramous, peduncle length 1.7 × breadth; ramus with 3 curved hooks. Telson length 0.6 × breadth, weakly cleft (25 %), each lobe with 26–27 anteriorly directed hooks in 2 rows.

Female (sexually dimorphic characters). Based on female 9.6 mm, MV J.11297. Antenna 1 flagellum 10-articulate. Antenna 2 flagellum 10-articulate. Pereonite 1 without lateral keel. Pereonites 1–3 without sternal keel. Pereonite 5 length 1.5 × depth. Gnathopod 1 basis, length 2.2 × depth; carpus length 0.7 × depth with setose posterior lobe. Gnathopod 2 subchelate; coxa, length 1.6 × depth; basis, length 1.9 × breadth. Pereopod 5 coxa, length 1.4 × depth. Oostegites from gnathopod 2 to pereopod 5.

Tube. Granular, fine or coarse grained, tubes of juveniles attached in a ring, circling the tube of adult female.

Habitat. Sub-littoral (3–84 m depth).

Remarks. The shape of gnathopod 2 propodus and carpus changes as males grow, with the propodus becoming curved and slender in large males. In males less than 5 mm in length, gnathopod 2 is subchelate and the carpus has a straight posterior margin. In males longer than 5 mm, gnathopod 2 becomes carpochelate and the carpus develops an excavate posterior margin with the excavate margin becoming shallower and wider in large males longer than 9 mm.

Kapalana kimbla and K. amelga both have a strong subquadrate projection along the posterior margin of peduncular article 1 of antenna 1, a large apical robust seta on the inner ramus of uropod 1 and a shallow excavate palm on gnathopod 2. TheY differ in a number of characters including the posterior margin of the carpus of gnathopod 2 which is smooth in K. kimbla , but has a row of small spines in K. amelga . Kapalana kimbla is the only species with 3 curved hooks on uropod 3.

Distribution. Australia. Victoria: Bass Strait; Wilsons Promontory. South Australia: Venus Bay.

Figures

Figure 7. Kapalana kimbla sp. nov., holotype, male, 9.4 mm, MV J70496; paratype male “a”, 3.9 mm, MV J70502; paratype, male “b”, 4.6mm, MV J70501; paratype, male “c”, 5.7 mm, MV J70500; paratype, male “d”,6.8 mm, MV J70498; paratype, male “e”,7.4 mm, MV J70499; paratype female, 9.6 mm, MV J70497; Bass Strait, Victoria,Australia. Gnathopod 2 males “a”, “b”, “c”, “d”, “e” insertion points of setae are indicated by small circles. Scales represent 0.1 mm.

Figure 8. Kapalana kimbla sp. nov., holotype, male, 9.4 mm, MV J70496; paratype, female, 9.6 mm, MV J70497; Bass Strait, Victoria, Australia. Pleopods 1–3 insertion points of setae are indicated by small circles. Scales represent 0.1 mm.