Campylaspis trisulcata, 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 : 155-156

Campylaspis trisulcata sp. nov.

Figures 40 , 41

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 J52950.

Diagnosis. Carapace large, with 3 lateral sulci. Propodus of maxilliped 2 with robust outer seta longer than dactylar teeth. Maxilliped 3 with 2 long plumose setae on outer distal corner, merus 2nd longest article, simple terminal setae twice as long as dactylus. Pereopod 1 with short articles, with numerous plumose setae. Pereopod 2 with carpus 1.3 times as long as merus, dactylus 3 times as long as propodus. Uropod peduncle 2.3 times as long as pleonite 6 and 1.9 times as long as endopod, with serrated inner margin, exopod shorter than endopod, with robust terminal seta, endopod with 5 stout setae on serrated inner margin, long robust terminal seta.

Description. Body with strongly calcified, smooth, integument. Length: 5.1 mm.

Carapace 0.46 body length, twice as long as high, 1.1 times as long as wide, with 3 lateral sulci with strongly elevated margins, transverse lateral ridge at level of base of frontal lobe, ocular lobe without eyes, antennal notch small, anterolateral corner with short serration.

Antenna 1 short, peduncle with progressively shorter articles, main flagellum 3-articulate, little longer than last article of peduncle, accessory flagellum minute, uniarticulate.

Maxilliped 2 strong, with long plumose setae on basis and merus, tooth and 2 simple setae on carpus, propodus 2nd longest article, with robust outer seta longer than dactylar teeth, dactylus with 3 teeth, median one shorter. Maxilliped 3 basis little less than half as long as appendage, with 2 long plumose seta on outer distal corner, merus 2nd longest article, strongly serrated on inner margin, with tooth and plumose seta on outer margin, carpus 0.55 of merus length, long plumose seta on outer margin, propodus 0.75 of merus length, with 3 pappose setae on inner margin, simple terminal setae twice as long as dactylus.

Pereopod 1 with short articles, with numerous plumose setae, basis little less than half as long as appendage, merus to propodus with serrated margins, merus 2nd longest article, carpus shorter than merus, propodus longer than carpus and 1.5 times as long as dactylus, dactylus with simple setae. Pereopod 2 basis less than half as long as appendage, plumose seta on inner margin of basis and merus, with carpus 1.3 times as long as merus, with simple seta and plumose seta on distal inner corner, dactylus 3 times as long as propodus, with simple setae, terminal one subequal to dactylus. Pereopods 3–5 basis longer than rest of articles combined, shorter in last pair, carpus twice as long as merus, dactylus fused with terminal seta. Exopods on maxilliped 3 and pereopods 1, 2.

Uropod peduncle 2.3 times as long as pleonite 6 and 1.9 times as long as endopod, with serrated inner margin, exopod shorter than endopod, with robust terminal seta, endopod with 4 stout setae on serrated inner margin, single subterminal setule and long robust terminal seta shorter than endopod.

Etymology. The name “ trisulcata ” reflects the presence of three lateral sulci on the carapace.

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

Remarks. C. trisulcata is similar to two other species with three or four lateral ridges on the carapace delimiting depressions (sulci): C. triplicata Hale, 1945 from Australia and C. sinuosa Gamô, 1960 from Japan. C. triplicata has four lateral ridges delimiting three depressions, and a massive merus on maxilliped 3. C. sinuosa is much closer, with four lateral ridges on the carapace but bordering only two depressions, not three as in C. trisulcata (more evident in dorsal view). It also differs in: the dactylus of maxilliped 2 with four teeth (three in C. trisulcata ); a massive maxilliped 3 with teeth on the propodus and short setae on the dactylus (versus smooth propodus and long terminal setae of dactylus); shorter uropods; and an endopod with two setae on its inner margin (versus four setae in C. trisulcata ).

Figures

Figure 40. Campylaspis trisulcata 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, 1; c, 0.25; d, 0.3; e, 0.25.

Figure 41. Campylaspis trisulcata 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, b, 0.5; c–f, 0.25.