Campylaspis grossui, 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 : 136-138

Campylaspis grossui sp. nov.

Figures 10 , 11

Material examined. Holotype female. Vic., eastern Bass Strait , 11.2 km E of eastern edge of Lake Tyers, 37°51.41'S, 148°13.16'E, 32 m, sand-shell, Smith-McIntyre grab, Marine Science Laboratories, RV Sarda , 25 Sep 1990 (stn MSL-EG 27 ), NMV J27468.

Paratypes: 1 female (stn MSL-EG 27 ), NMV J27468 ; 1 female, dissected (stn MSL-EG 27 ), NMV J52952 ; 1 female, 1 male (stn MSL-EG 26 ), NMV J27467 ; 1 female (stn MSL-EG 26 ), MGAB CUM 1607 ; 1 immature male, NMV J 27469; 1 female, NMV J27470.

Diagnosis. Carapace with large lateral sulcus (almost as long as carapace), not meeting on posterior end, with dorsal tubercles. Pleon with short segments. Maxilliped 2 with long dactylar teeth. Pereopod 1 with large merus with an inner concavity. Pereopod 2 with large articles, dactylus wide, with short stout terminal seta. Pereopods 3–5 robust, dactylus fused with short robust, terminal and curved seta. Uropod peduncle 1.4 times as long as pleonite 6, 1.5 times as long as its equal rami, exopod and endopod with very short robust terminal seta, 2 short robust setae on inner margin of endopod.

Description. Body with highly calcified glabrous integument. Length: 3.95 mm.

Carapace 0.5 body length, twice as long as high, with long lateral sulcus, opened towards anterior, not meeting at posterior end, large and small lateral and dorsal tubercles, antennal notch wide, pseudorostrum meeting in front of eyeless ocular lobe. Pereonites 1–4 covered almost completely by carapace. Pleon with anteroposterior compressed segments, shorter than carapace.

Antenna 1 short and robust, median article of peduncle longest, main flagellum as long as distal article of peduncle, 3-articulate, accessory flagellum tiny, uniarticulate.

Maxilliped 2, long plumose seta on inner margin of basis and on distal article of merus, carpus with large tooth on inner margin, propodus second longest article, a long robust distal seta as long as dactylar teeth, dactylus with 3 teeth, 2 of them longer than propodus, median one-half of other two. Maxilliped 3 with wide basis, shorter than rest of articles combined, with 6 long plumose setae on inner margin and 1 on outer margin, ischium to dactylus slender, merus second longest article, with plumose seta on outer distal margin, carpus with plumose seta midway on outer margin, propodus 0.57 of carpus, dactylus short, slender, half of propodus, with short simple terminal setae.

Pereopod 1 basis less than half as long as appendage, with 2 plumose setae on inner margin, wide merus with inner concavity with numerous setae, carpus more slender than merus, second longest article, propodus shorter than merus, dactylus 0.5 of propodus, with short simple terminal setae. Pereopod 2 with short, very robust articles, basis less than half as long as appendage, long plumose seta on inner margin of basis, ischium and merus, carpus 1.2 times as long as merus, with 2 simple setae on distal inner corner, dactylus broad, twice propodus length, with short stout hooked terminal seta. Pereopods 3–5 robust, with progressively shorter basis, and longer carpus, dactylus fused with its robust terminal short seta. Exopods on maxilliped 3 and pereopods 1, 2.

Uropod peduncle 1.4 times as long as pleonite 6, 1.5 times as long as its equal rami, exopod and endopod with short robust terminal seta, 2 short robust setae on inner margin of endopod.

Etymology. The species is dedicated to the memory of the late Prof. Dr Alexandru V. Grossu (1910–2004) as a sign of gratitude for his moral and professional qualities as a brilliant scientist and mentor. He was the most important Romanian specialist in malacology, highly appreciated throughout the world, former director of “Grigore Antipa” National Museum of Natural History (1955–1957), founder of its scientific journal, professor of zoology and Dean of the Faculty of Biology in Bucharest (1957–1962).

Distribution. Eastern Vic.; 32 m depth.

Remarks. Campylaspis grossui is closely related to C. wardi Băcescu, 1991 and C. sculpta . All three have a similar carapace, and short and robust pereopods and uropods. Campylaspis grossui differs from C. wardi in several characteristics: fewer tubercles on the carapace; longer teeth on the dactylus of maxilliped 2; more slender carpus of maxilliped 3; uropods with smooth margins; two short stout setae on the inner margin of endopod versus none; and terminal short setae without the oval structures characteristic of C. wardi . Campylaspis grossui differs from C. sculpta in the shape of the carapace in dorsal view, more robust antenna 1, maxilliped 3 and pereopod 1 with more slender articles, pereopod 2 with a much shorter dactylus (twice as long as the propodus in C. grossui versus four times in C. sculpta ) and without a digitiform extremity, and more slender uropod rami with longer setae.

Figures

Figure 10. Campylaspis grossui sp. nov. female paratype: a, body, lateral view; b, body, dorsal view; c, antenna 1; d, maxilliped 2; e, maxilliped 3. Scale (in mm): a, b, 1; c, d, 0.3; e, 0.5.

Figure 11. Campylaspis grossui sp. nov. female paratype: 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–e, 0.5; f, 0.25.