Campylaspis lynseyae, Petrescu, 2006

Petrescu, Iorgu, 2006, Nannastacidae (Crustacea: Cumacea) from eastern Bass Strait, the south-eastern Australian slope, and Antarctica in the collections of Museum Victoria, Memoirs of Museum Victoria 63 (2), pp. 129-173 : 144-145

Campylaspis lynseyae sp. nov.

Figures 22 , 23

Material examined. Holotype female, Tas., off Freycinet Peninsula, 42°02.20'S, 148°38.70'E, 800 m, coarse shelly sand, WHOI epibenthic sled, M.F. Gomon et al., RV Franklin, 27 Jul 1986 (stn SLOPE 45 ), NMV J52962.

Paratypes: 2 immature males, 1 manca (stn SLOPE 45 ), NMV J52963 .

Diagnosis. Carapace with large lateral sulcus, 0.53 body length, 1.7 times as long as high, large lateral sulcus (0.8 of carapace length). Small dorsal teeth on first 2 pleonites. Antenna 1 slender. Robust seta of propodus of maxilliped 2 as long as dactylar teeth. Maxilliped 3 slender, dactylus with long terminal simple setae. Pereopod 1 with merus twice as long as propodus, few setae on both margins. Pereopod 2 with digitiform tip of dactylus. Dactylus of pereopods 3–5 fused with its terminal stout seta. Uropod peduncle little more than twice pleonite 6 length, 1.7 times as long as endopod.

Description. Body with calcified smooth integument. Length: 2.36 mm.

Carapace 0.53 body length, 1.7 times as long as high, large lateral sulcus (0.8 of carapace length, 4.6 times as long as high), not meeting the dorsal side, frontal lobe with large base, pair of small tubercles at base of this lobe, ocular lobe with acute top, without eyes, long pseudorostrum not upturned, large siphon, small antennal notch, anteroventral corner acute, short serration of ventral margin in anterior part. Pleonites 1 and 2 with a pair of dorsal teeth and a lateral tubercle. Pereonite 6 with small tooth on posteroventral corner.

Antenna 1 basal article of peduncle the longest, with 2 long simple setae, main flagellum, 3-articulate, longer than distal article of peduncle, accessory flagellum minute.

Maxilliped 2 with plumose seta on distal inner corner of basis and median part of merus, tooth and 2 simple seta on inner margin of carpus, propodus second longest article, with robust seta on outer distal corner as long as dactylar teeth and tooth on inner margin, dactylus fused with its forked-like teeth, median one much shorter. Maxilliped 3 basis less than half as long as appendage, with 2 plumose setae on inner and outer margin, no outer process, long and slender merus, second longest article, with small inner concavity, and plumose seta on both margins, carpus half merus length, with 3 teeth on outer margin, propodus longer than carpus, dactylus shorter than propodus, with simple terminal setae much longer than propodus.Pereopod 1 basis less than half as long as appendage, merus 3 times as long as ischium, second longest article, carpus 0.6 length of merus, 1.25 of propodus, propodus twice as long as dactylus, few setae on ischium to dactylus, dactylus with simple short setae. Pereopod 2 basis less than half as long as appendage, plumose seta on inner margin of merus, carpus 1.4 times as long as merus, with simple and plumose seta on inner distal corner, dactylus 5 times as long as propodus, with few setae on both margins and a pronounced digitiform tip with 2 simple subterminal setae. Pereopods 3–5 with progressively shorter basis and longer carpus (carpus more than twice merus), dactylus fused with its terminal stout seta. Exopods in maxilliped 3 and pereopods 1, 2.

Uropod peduncle little more than twice length of pleonite 6, 1.7 times as long as endopod, serrated inner margin, without any setae, exopod 0.8 of endopod length, with short stout subterminal seta and much longer terminal one, endopod with 3 stout setae with subterminal setule on inner serrated margin and terminal robust seta.

Etymology. The species is dedicated to Lynsey Poore as a sign of gratitude for the kindness shown during my short visit to Melbourne.

Distribution. Off Freycinet Peninsula, Tas.; 800 m depth.

Remarks. The new species has a large lateral sulcus like C. anae and C. rectangulata . It differs from these species by presence of a pair of small tubercles on the base of the ocular lobe, longer antenna 1, slender maxilliped 3 and pereopod 1 and digitiform extremity of the dactylus of pereopod 2 (extremity broken in C. anae ). C. spinifera also has a similar sulcus, a pair of tubercles on the base of the ocular lobe but with a supplementary tubercle with a spine on top on the lower margin of the sulcus near the anterolateral corner, a shorter, larger merus of maxilliped 3, and pereopod 2 with a tapering extremity to the dactylus.

Figures

Figure 22. Campylaspis lynseyae sp. nov. female holotype: a, body, lateral view; b, carapace, dorsal view; c, antenna 1; d, maxilliped 2; e, maxilliped 3. Scale (in mm): a, b, 0.5; c, 0.2; d, 0.1; e, 0.25.

Figure 23. Campylaspis lynseyae sp. nov. female holotype: a, pereopod 1; b, pereopod 2; c, pereopod 3; d, pereopod 4; e, pereopod 5; f, pleonite 6 and left uropod. Scale (in mm): a–f, 0.25.