Campylaspis sculpta, 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 : 148-149

Campylaspis sculpta sp. nov.

Figures 29 , 30

Material examined. Holotype immature male, dissected, Vic., eastern Bass Strait, 7.3 km SSW of Cape Conran , 37°52.67'S, 148°42.06'E, 48 m, sand-shell, Smith-McIntyre grab, Marine Science Laboratories, RV Sarda , 28 Sep 1990 (stn MSL-EG 62 ), NMV J23259.

Paratypes: 1 immature male (stn MSL-EG 108 ), NMV J27471; 1 manca (stn MSL-EG 57 ), NMV J23258, 1 manca (stn MSL-EG 62 ), NMV J52955 .

Diagnosis. Carapace highly sculptured, with short thoracic and abdominal segments. Maxilliped 3 and pereopod 1 with enlarged articles, except dactylus, propodus 2nd longest article after basis. Pereopod 2 with enlarged articles, with long dactylus, longer than basis, with digitiform tip. Pereopods 3–5 with short and robust articles, dactylus fused with robust terminal seta. Short and robust uropods, uropod peduncle 1.25 times as long as pleonite 6 and 1.3 times as long as equal rami. Exopod and endopod (wider than exopod) with rounded tips, with fine short setae.

Description Body with strongly calcified and smooth integument. Length: 6.08 mm.

Carapace 0.49 body length, 1.9 times as long as high, with large, blunt tubercles around large lateral sulcus (0.8 of carapace length), pseudorostrum short, ocular lobe large, without lenses, pair of tubercles and transverse ridge at its base, antennal notch small, anterolateral corner continued towards ocular lobe by an oblique ridge.

Antenna 1 peduncle with short and robust articles, median article as long as distal one, main flagellum with 3 short and robust articles, shorter than last article of peduncle, median and distal article with an aesthetasc, accessory flagellum tiny, uniarticulate.

Maxilliped 3 basis half of appendage, with 2 plumose setae on inner distal corner and another longer 2 on distal outer corner, merus longer than carpus and ischium, shorter than propodus (0.7), with long plumose seta on outer margin, carpus about half propodus, with small tooth and plumose seta on outer margin, propodus 2nd longest article, with short plumose seta on outer margin and 2 fine setae on inner margin, dactylus 0.2 length of propodus, enlarged, with fine terminal seta.

Pereopod 1 basis half of appendage, with 3 long plumose setae on inner margin, enlarged ischium to dactylus, ischium with tooth and long plumose seta on inner margin, merus widest article, with plumose setae on inner margin, carpus as long as merus, with plumose seta on outer margin, propodus, 2nd longest article, 1.1 times as long as carpus, with 3 plumose setae on outer margin, oval dactylus 0.7 of propodus length, with fine terminal seta. Pereopod 2 basis shorter, less than 3rd of appendage length, ischium with 3 simple setae on inner margin, robust merus, the widest article, with small tooth and 3 simple setae on inner margin, carpus little longer than merus, with small tooth and short plumose seta on inner distal corner, long, curved and with digitiform dactylus, 4.6 times as long as propodus, longest article, with 3 fine subterminal setae. Pereopod 3 basis more than half of appendage, merus twice as long as ischium, carpus 0.7 of merus length, with stout long seta on outer margin, propodus 0.6 of carpus length, with robust distal seta, dactylus fused with robust terminal seta. Pereopod 4 basis shorter than in previous pair, merus subequal to carpus, propodus little longer than in previous pair. Pereopod 5 with shorter basis, carpus 1.8 times as long as merus. Exopods, 5 pairs.

Pleonite 6 and uropod with hyaline fringes. Uropod short and robust, uropod peduncle 1.25 times as long as pleonite 6 and 1.3 times as long as equal rami, serrated inner margin, exopod and endopod (wider than exopod), with rounded tips and serrated inner margins, exopod with 3 fine terminal setae, endopod with 3 stout short setae, terminal one little longer.

Etymology. The name “ sculpta ” refers to the sculptured carapace.

Distribution. Eastern Vic.; 48–50 m depth.

Remarks. Campylaspis sculpta is similar to C. wardi Băcescu, 1991 and C. grossui . They have similar carapaces, short and robust pereopods and uropods. C. sculpta differs from C. wardi in: fewer tubercles on the carapace; larger sulcus; larger propodus (second longest article) and rounded dactylus of maxilliped 3; larger propodus and dactylus; rounded dactylus of pereopod 1; much longer dactylus of pereopod 2; and the uropod exopod with few terminal fine setae and the endopod with three stout ones, versus the endopod with terminal short setae with the oval structures characteristic of C. wardi . The shape of the carapace in dorsal view is different from C. grossui . The species also differ in: stronger antenna 1, tiny rounded dactylus of maxilliped 3 and enlarged and rounded dactylus of pereopod 1, versus slender antenna 1 and maxilliped 3 and pereopod 1 with larger articles and dactylus in C. wardi and C. grossui . Pereopod 2 has a much longer dactylus, four times as long as the propodus in C. sculpta , and with a digitiform extremity, versus twice as long in C. wardi and C. grossui , which have a normal extremity. The uropod rami are stronger than in C. grossui and it also has finer setae.

Figures

Figure 29. Campylaspis sculpta sp. nov. female holotype: a, body, lateral view; b, body, dorsal view; c, antenna 1; d, maxilliped 3; e, pereopod 1. Scale (in mm): a, b, 1; c, 0.5; d, e, 0.5.

Figure 30. Campylaspis sculpta sp. nov. female holotype: a, pereopod 2; b, pereopod 3; c, pereopod 4; d, pereopod 5; e, pleonite 6 and right uropod. Scale (in mm): a–d, 0.5; e, 0.5.