Campylaspis pisum, Vassilenko, Stella & Tzareva, Ludmila, 2004

Vassilenko, Stella & Tzareva, Ludmila, 2004, New Cumacea species (Malacostraca, Peracarida) from the deepwater area of the Sea of Japan (Collections of the 52 Cruise by the R / V « Vityaz », 1972), Zootaxa 702, pp. 1-16 : 13-16

Campylaspis pisum sp. nov.

( Figs. 7–8 )

Material examined: holotype, adult female of 3.1 mm length, kept in the collection of Zoological Institute, ( ZIN ­ 1/88376), R/V “Vityaz”, 52nd cruise, sta. 6660; Sea of Japan, 32º40´9´´N, 135º16´8´´E, depth 865–950 m, substrate: thick gray clay silt. “SIGSBY” trawl.

Paratypes: ( ZIN ­ 2/88377), 1 females of 2.7 mm length ( Fig.7 , C), 1 male of 3.2 mm length, same locality.

Diagnosis: Pseudorostum with anterior edge truncated. Ocular area widely oval. Carapace sculpture fine­granulated. Carapace with near parallel margins in dorsal view. Lateral sides of carapace traversed with three pairs of oblique lateral bulging ridges; anterior (1st) and middle (2nd) pairs of ridges connected by transversal ridge in anterior half of carapace; anterior ridges also connected by transversal wide ridge, immediately posterior to ocular area.

Description of the holotype: Female ( Fig. 7 , A, B). Pseudorostrum short, its anterior edge truncated, dorsal part of pseudorostrum slightly upturned upwards. Sub­rostral notch flat, antero­lateral angles slightly pronounced. Ocular area widely oval, bulging. Carapace sculpture fine­granulated. Carapace with near parallel margins in dorsal view. Lateral sides of carapace traversed with 3 pairs of oblique lateral bulging ridges; anterior (1st) and middle (2nd) pairs of ridges connected by transversal ridge in anterior half of carapace; anterior ridges also connected by transversal wide ridge, immediately posterior to ocular area; the 3rd pair of ridges fringes posterior and postero­lower carapace margins. Lateral sides of carapace recessed between ridges. Thoracic segments II–VI with lateral wing­shaped projections. Abdominal section shorter than cephalothorax. First three abdominal segments with delayed lateral sharp angles. Sixth abdominal segment with equal length and width.

Maxilliped III ( Fig. 8 , A) with wide basis; ischium with denticle on inner angle; merus and propodus denticulate on inner margin; carpus with three stout denticles on outer margin; dactylus very small and thin.

Pereopod I ( Fig. 8 , B) with wide basis, length almost equal to length of ischium­propodus combined, all articles with plumose setae, merus and carpus bearing several denticles along anterior and posterior borders; dactylus very narrow, slightly shorter than propodus. Pereopod II ( Fig. 8 , C) with a short and broad basal article; dactylus elongated, length equal to length of three preceding articles combined.

Uropods ( Fig. 7 , D) slightly shorter than last three abdominal segments combined; peduncle length exceeding its width more than 4 times; inner peduncle margin crenulated. Endopodite much less than half length of peduncle, along inner margin in distal half bearing three short lateral setae and to terminal of different lengths; exopodite slightly shorter than endopodite, with two apical setae of different length on terminal article.

Remarks. The new species is most similar to Campylaspis costata , and differs by truncated pseudorostrum, larger, rounded and bulging ocular area; by the presence of the transversal ridge, located behind the ocular area, by more developed wing­shaped projections on thoracic segments in comparison with C. costata Sars, 1864 .

Figures

FIGURE 7. Campylaspis pisum sp. nov. A — adult female, dorsal view; B — adult female, lateral view; C — juvenile female, lateral view; D — VI abdominal segment and uropods.

FIGURE 8. Campylaspis pisum sp. nov. A — maxilliped III; B — pereopod I; C — pereopod II.