Campylaspis longidentata, 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 : 142-143

Campylaspis longidentata sp. nov.

Figures 20 , 21

Material examined. Holotype female, Tas., off Freycinet Peninsula, 42°00.20'S, 148°37.70'E, 720 m, coarse shelly sand, WHOI epibenthic sled, M.F. Gomon et al., RV Franklin, 27 Jul 1986 (stn SLOPE 46 ), NMV J52944.

Diagnosis. Carapace with an oblique, concave ridge from dorsal side toward the lower margin, covered with pits and spines. Maxilliped 2 with long terminal teeth, longer than usual, propodus with long robust distal seta and dactylus also with long teeth. Maxilliped 3 with serrated margins. Pereopod 1 with serrated margins on basis to propodus, with slender articles. Pereopod 2 with dactylus 5 times as long as propodus, and with long digitiform extremity. Slender uropod peduncle 2.48 times as long as pleonite 6 and 1.9 times as long as equal rami.

Description.Bodyelongated,withstronglycalcified integument. Length: 3.7 mm.

Carapace about half of body, longer than high, covered with numerous pits bordered by little spines, antennal notch obvious, anterolateral corner acute, lower margin with tooth on anterior half, pseudorostral lobes meeting in front of eyeless ocular lobe at a distance longer than length of frontal lobe, concave ridge from dorsal side toward lower margin. A tooth on lateral plate of pereonite 5, a pair of dorsal teeth on pleonites 1–3.

Antenna 1 peduncle articles progressively shorter, basal and median articles with tubercle on inner margin, main flagellum 3-articulate, longer than distal article of peduncle, basal article of flagellum much more than half flagellum length, accessory flagellum tiny, uniarticulate.

Maxilliped 2 basis with plumose seta on distal margin, ischium fused to basis, carpus second longest article, with 4 teeth (2 stronger) and axe-like tooth on inner margin, propodus with long robust distal seta, dactylus with 3 long teeth, median one shorter, twice as long as propodus. Maxilliped 2 visible between pereopod 1 and maxilliped 3 in lateral view. Maxilliped 3 basis shorter than 0.5 of appendage, with serrated margins, 2 plumose setae on outer distal corner, merus second longest article, with serrated margins and plumose seta on outer margin, carpus longer than propodus, with plumose seta on outer margin, propodus twice as long as dactylus, with 2 pappose setae on inner margin, dactylus with short simple terminal setae.

Pereopod 1 with slender articles, basis shorter than rest of articles combined, with serrated margins, plumose seta on distal inner and outer corner, tooth on inner margin of ischium, merus shorter than carpus, carpus shorter than propodus, propodus 1.6 times as long as dactylus, with simple setae. Pereopod 2 with slender articles, basis less than half length of appendage, plumose seta on inner distal corner, simple and plumose setae on inner margin of merus, carpus 2.8 times as long as merus, with robust short seta and plumose seta on its distal inner corner, dactylus 5 times as long as propodus, with long digitiform extremity, and simple setae on both margins. Pereopods 3–5, with progressively shorter basis and carpus, dactylus with long stout terminal seta. Exopods on maxilliped 3 and pereopods 1, 2.

Uropod slender, peduncle 2.5 times as long as pleonite 6 and 1.9 times as long as equal rami, with serrated inner margin, exopod with short stout terminal seta, endopod with 3 stout setae on inner margin and robust longer terminal seta.

Etymology. The name of the species is derived from the Latin “ longa ” – “long” and “ dentata ” – “with teeth”, due to the long teeth of maxilliped 2.

Distribution. Off Freycinet Peninsula, Tas.; 720 m depth.

Remarks. The texture of the carapace integument with pits and spines is as in C. sagamiensis Gamô, 1967 from Japan. It differs mainly in maxilliped 2 and pereopod 2 with a digitiform tip to the dactylus. The presence of such long dactylar teeth on maxilliped 2 is a unique feature within the genus Campylaspis .

Figures

Figure 20. Campylaspis longidentata sp. nov. female holotype: a, body, lateral view; b, detail of its integument; c, carapace, dorsal view; d, antenna 1; e, maxilliped 2; f, maxilliped 3; g, pereopod 1. Scale (in mm): a, c, 1; d, 0.25; e–g, 0.25.

Figure 21. Campylaspis longidentata 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–e, 0.5.