Campylaspis serrata, 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 : 149-151

Campylaspis serrata sp. nov.

Figures 31 , 32

Material examined. Holotype female, NSW, off Nowra, 34°51.90'S, 151°12.60'E, 770 m, crinoid dominated, WHOI epibenthic sled, G.C.B. Poore and C.C. Lu, RV Franklin, 15 Jul 1986 (stn SLOPE 6 ), NMV J45786.

Diagnosis. Carapace covered with spines, small tubercles and long club-like setae interspersed with pits. Integument of pereon and pleon with pits and small spines. Antenna 1, maxilliped 3, pereopods 1 and 2 and uropods with densely serrated margins. Maxilliped 3 with merus second longest article, with long outer spine, carpus with 3 outer teeth, dactylus with long simple setae longer than article. Pereopod 1 with slender articles, with few setae. Pereopod 2 with long dactylus with straight tip. Uropod peduncle 2.25 times as long as pleonite 6 and 1.9 times as long as exopod, exopod little longer than endopod.

Description. Body with integument densely pitted, with bludgeon-like setae, small tubercles and spines on carapace and with small spines on rest. (The only specimen, holotype, is not in good shape, being a little dorsally compressed and twisted). Length: 4.5 mm.

Carapace about half body length, 1.3 times as long as wide, almost triangular in dorsal view, pair of small tubercles in median region, bigger one on branchial part and larger ones with spine on top at base of frontal lobe, integument densely pitted, with long spines and club-like setae, ocular lobe with spoon-like tip with crown of small spines, without eyes, pseudorostral lobes straight. Lateral plates of pereon with long spines, integument covered with pits and small spines. Pleon with pits and spines (longer ones are broken).

Antenna 1 peduncle with strongly serrated articles, main flagellum 3-articulate, longer than distal article of peduncle, accessory flagellum minute, uniarticulate.

Maxilliped 2 with strong plumose setae on inner margin of basis and distally on merus, carpus with small tooth and 2 simple setae on inner margin, propodus 2nd longest article, with robust seta on outer distal corner, longer than dactylar teeth, dactylus with 3 teeth, median one minute. Maxilliped 3 with slender articles, basis less than half as long as appendage, with plumose seta on inner margin and 2 longer ones on outer distal corner, no outer process of basis, merus second longest article, with strong tooth and plumose seta on outer distal corner, carpus shorter than merus, with 3 teeth on outer margin, propodus little longer than carpus, with 3 pappose setae on inner margin, dactylus 0.75 of propodus length, with long simple setae, longer than dactylus.

Pereopod 1 with slender articles, basis longer than rest of articles combined, with 3 plumose setae on outer margin, ischium with 3 teeth (one larger) on inner margin, merus little shorter than carpus, with plumose seta on outer margin, carpus 2nd longest article, with simple setae, propodus subequal to merus, with simple setae, dactylus 0.57 of propodus length, with long simple setae. Pereopod 2 basis more than 3rd of appendage length, with plumose seta on distal inner corner, ischium and merus with similar seta, carpus 1.7 times as long as merus, with small tooth and long plumose seta on inner distal corner, dactylus 3.75 times as long as propodus, with numerous simple setae, and 1 terminal longer simple stout seta. Pereopods 3–5 with serrated margins, progressively shorter, with plumose setae, progressively shorter carpus (3 times as long as merus in 3rd pair), with plumose seta on inner margin and stout simple one on distal corner, dactylus with long stout simple terminal seta. Exopods on maxilliped 3 and pereopods 1, 2; with serrated bases.

Uropod peduncle 2.25 times as long as pleonite 6 and 1.9 times as long as exopod, with highly serrated margins, exopod little longer than endopod, with serrated margins and robust terminal seta, endopod with serrated margins, with 2 long microserrate setae on inner margin and a longer, more robust, terminal one.

Etymology. The name of the species describes the serrated appendages.

Distribution. Off Nowra, NSW; 770 m depth.

Remarks. Another species of Campylaspis with such highly serrated appendages is C. echinata Hale, 1945 (described only from the male). C. serrata has a differently textured carapace integument, densely pitted, with long spines and bludgeon-like setae, an ocular lobe with a spoon-like tip with a crown of small spines, uropods with the exopod slightly longer than the endopod, and the endopod with two microserrate long setae on the inner margin instead of one.

Figures

Figure 31. Campylaspis serrata sp. nov. female holotype: a, body, dorsal view; b, detail of integument from carapace; c, detail of integument of pereon and pleon; d, antenna 1; e, maxilliped 2. Scale (in mm): a, 1; d, 0.25; e, 0.2; f, 0.25.

Figure 32. Campylaspis serrata sp. nov. female holotype: a, pereopod 1; b, pereopod 2; c, pereopod 3; d, pereopod 4; e, pereopod 5; f, pleonite 6 and right uropod. Scale (in mm): a, b, 0.5; c–e, 0.5; f, 0.25.