Procampylaspis poorei, 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 : 158-159

Procampylaspis poorei sp. nov.

Figures 45 , 46

Material examined. Holotype female, Antarctica, Eastern Prydz Bay , off the Larsemann Hills, 68°54.88'S, 76°37.03'E, 667–716 m, epibenthic sled, P.M. OʼLoughlin, RSV Aurora Australis , 18 Feb 1993 (stn AA93 158), NMV J53009.

Diagnosis. Carapace with 3 dorsal tubercles, a pair medially and 1 in posterior half, ocular lobe eyeless, close to anterior extremity of pseudorostrum, with spine on top. Maxilliped 2 with 1st dactylar tooth longer than 2nd tooth and shorter than 3rd one, 5th tooth twice as long as 3rd tooth. An inner tooth on ischium of maxilliped 3, 2 teeth on outer margin of merus and carpus. Pereopod 1 with slender articles, merus as long as carpus. Dactylus of 2nd pereopod 2 twice as long as propodus, with plumose setae. Uropod peduncle 1.7 times as long as pleonite 6 and 1.4 times as long as endopod, endopod longer than exopod, with 3 microserrate setae on inner margin.

Description. Body with highly calcified integument. Length: 3.8 mm.

Carapace 0.46 body length, twice as long as high, with 3 dorsal tubercles on midline, a close pair medialy and 1 in posterior half, covered with pitted integument, ocular lobe eyeless, close to anterior extremity of pseudorostrum, with spine on top, antennal notch small, lower margin smooth.

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

Maxilliped 2 with pappose seta on inner distal margin of basis and carpus, propodus second longest article, with short plumose seta on inner margin, 1st dactylar tooth longer than 2nd tooth and shorter than 3rd one, 5th tooth twice as long as 3rd tooth. Maxilliped 3 with 2 plumose setae on inner and outer distal corner, inner tooth on ischium, 2 teeth and plumose seta on outer margin of merus and carpus, merus 2nd longest article, carpus as long as propodus, dactylus 0.68 times as long as propodus, with long simple terminal setae.

Pereopod 1 with slender articles, basis less than half as long as appendage, merus as long as carpus, propodus twice as long as carpus, second longest article, dactylus half of propodus. Pereopod 2 basis shorter than rest of articles combined, merus with tooth and simple seta on inner margin, carpus slightly longer than merus, with 2 simple setae on inner distal corner, dactylus twice as long as propodus, with plumose setae. Pereopods 3–5 with progressively shorter basis (as long as half of appendage in 3rd and 4th pair), with plumose setae on outer margin, dactylus with long stout terminal seta. Exopods on maxilliped 3 and pereopods 1, 2.

Uropod peduncle 1.7 times as long as pleonite 6 and 1.4 times as long as endopod, exopod shorter than endopod, with subterminal microserrate seta and terminal robust longer seta, endopod with 3 microserrate setae on inner margin and robust, longer, terminal seta.

Etymology. The species is dedicated to Gary Poore, Principal Curator, Museum Victoria, Melbourne, Australia, specialist in Peracarida, as a sign of gratitude.

Distribution. Eastern Prydz Bay, off the Larsemann Hills, Antarctica; 667–716 m depth.

Remarks. The only species of Procampylaspis with fewer than five dorsal tubercles or spines on the carapace is P. compressa Zimmer, 1907 which has two pairs of spines versus three dorsal median tubercles as in P. poorei . The new species also differs from P. compressa in: ocular lobe with one median spine on the tip instead of two as in P. compressa ; antenna 1 with a longer main flagellum; and the first and second dactylar teeth of maxilliped 2 are separated up to the basis (versus not separated) and the maxilliped 3 has fewer teeth on its articles.

Figures

Figure 45. Procampylaspis poorei sp. nov. female holotype: a, body, lateral view; b, detail of integument of carapace; c, carapace, dorsal view; d, antenna 1; e, maxilliped 2. Scale (in mm): a, 0.5; c, 1; d, e, 0.2.

Figure 46. Procampylaspis poorei sp. nov. female holotype: a, maxilliped 3; b, pereopod 1; c, pereopod 2; d, pereopod 3; e, pereopod 4; f, pereopod 5; g, pleonite 6 and right uropod. Scale (in mm): a–f, 0.5; g, 0.25.