Memana sarda, Stoddart & Lowry, 2010

Stoddart, H. E. & Lowry, J. K., 2010, The family Aristiidae (Crustacea: Amphipoda: Lysianassoidea) in Australian waters, Zootaxa 2549 (1), pp. 31-53 : 46-47

Memana sarda sp. nov.

( Figs 16–18 )

Type material. HOLOTYPE, female with nonsetose oostegites, 5.0 mm, MV J59381 , 47 km east of Cape Rochon , Three Hummock Island, Tasmania, Central Bass Strait, Australia, 40°23.8’S 145°32’E, 65 m, muddy sand, epibenthic sled, 3 November 1980, M.F. Gomon & G.C.B. Poore, FRV Sarda , stn BSS-113S . PARATYPES, 1 male, 3.5 mm, MV J59382 and 3 specimens, MV J59383 and 1 female, 3.5 mm, AM P.81147 and 2 specimens, AM P.81148, 32 km north-west of Devonport , Tasmania, Central Bass Strait, Australia, 40°56.0’S 146°5.4’E to 40°46.0’S 146°8.1’E, 64–68 m, mud, otter trawl, 4 February 1981, M.F. Gomon & G.C.B. Poore, FRV Hai Kung, stn BSS-134 ; 1 specimen, MV J59384 , 39 km north-north-east of Devonport , Tasmania, Central Bass Strait, Australia, 40°49.8’S 146°31.3’E to 40°48.2’S 146°33.7’E, 68–70 m, mud with bryozoans and sponges, otter trawl, 4 February 1981, M.F. Gomon, G.C.B. Poore & C.C. Lu, FRV Hai Kung, stn BSS-135 ; 1 specimen, MV J59385 , 5 km north-east of Mistaken Cape , Maria Island, Tasmania, Australia, 42°37’S 148°12.5’E, 100 m, fine muddy bryozoan, epibenthic sled, 23 April 1985, RV Challenger, stn MV TAS-31 .

Type locality. 47 km east of Cape Rochon , Three Hummock Island, Tasmania, Central Bass Strait, Australia, 40°23.8’S 145°32’E, 65 m depth .

Etymology. The species is named for the Fisheries Research Vessel Sarda from which the type material was collected.

Description. Head lateral cephalic lobe broadly triangular, apically rounded; eyes well developed, oval. Antenna 1 accessory flagellum 2–3-articulate. Antenna 2 calceoli not present in male. Epistome and upper lip with weak central slit. Mandible lacinia mobilis absent; molar absent. Maxilla 1 inner plate with 3 apical pappose setae; outer plate with 9 setal-teeth in a 5/4 arrangement, with few or no cusps. Maxilliped palp 1- articulate.

Gnathopod 1 subchelate; carpus shorter than propodus, without posterodistal lobe; propodus posterior margin dentate, with 2 robust setae along posterior margin. Gnathopod 2 carpus longer than propodus. Pereopods 5–7 propodus with anterodistal spur. Pereopod 5 coxa posterior lobe deeper than anterior lobe, long, triangular; basis greatly expanded posteriorly, with posteroventral lobe. Pereopod 6 coxa posterior lobe subequal in length to anterior lobe, short, distally rounded; basis greatly expanded posteriorly, with posteroventral lobe. Pereopod 7 basis greatly expanded posteriorly, posterior margin evenly curved, with posteroventral lobe, posteroventral corner rounded.

Epimeron 3 posterior margin finely serrate, posteroventral corner subquadrate. Urosomite 1 with an anterodorsal depression and a rounded dorsodistal boss. Urosomite 3 without dorsolateral flanges. Uropod 3 rami without robust setae; inner ramus longer than article 1 of outer ramus. Telson longer than broad, entire, emarginate, without mid-dorsal robust setae, lateral margins curved, uniformly tapering distally, without robust setae on lateral margins, without apical robust setae.

Distribution. South-eastern Australia in 64–100 m depth.

Figures

FIGURE 16. Memana sarda gen. sp. nov. Paratype, female, 3.5 mm, AM P.81147.

FIGURE 17. Memana sarda gen. sp. nov. Holotype, female, 5.0 mm, MV J59381; Paratype male, 3.5 mm, MV J59382. Scale for MP represents 0.05 mm; remainder represent 0.1 mm.

FIGURE 18. Memana sarda gen. sp. nov. Holotype, female, 3.5 mm, MV J59381. Scales for U1–3 and T represent 0.1 mm; remainder represent 0.2 mm. *The inner ramus of uropod 3 shown here is an incomplete regrowth; the rami are subequal in length.