Campylaspis australiensis, 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 : 133-135

Campylaspis australiensis sp. nov.

Figures 5 , 6

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 J52415.

Paratypes: 5 females, 11 males, type locality, NMV J52933; 1 female, 2 males (stn SLOPE 46 ), MGAB CUM 1606; 1 manca , 1 female (stn SLOPE 47 ), NMV J52934 ; 2 males, 1 manca (stn SLOPE 48 ), NMV J52419; 1 manca (stn SLOPE 1 ), NMV J52413 ; 1 female, 1 male (stn SLOPE 45 ), NMV J52414 ; 1 immature male, dissected, NMV J52416.

Diagnosis. Carapace with acute tubercles, with a lateral sulcus. A pair of small dorsal tubercles on pereonite 5 and all pleonites, small lateral tubercle on pereonites 3–5 and pleonites 1–5. Antenna 1 accessory flagellum of 2 articles. Propodus of maxilliped 2 with long robust distal seta, longer than dactylar teeth. Merus and carpus of maxilliped 3 with teeth on outer margin. Dactylus of pereopod 2 3.7 times as long as propodus, with tapering extremity. Dactylus of pereopods 3–5 not fused with terminal seta. Uropod peduncle 1.8 times as long as pleonite 6, 1.4 times as long as endopod, with strongly serrated margins and longitudinal serrated crest, endopod slightly longer than exopod, with 3 microserrate setae on inner margin.

Description. Body with well calcified and hardened reticulated integument. Length: 3.06 mm.

Carapace 0.5 body length, 1.7 times as long as high, with a lateral sulcus, 0.5 of carapace length, open towards anterior part, bordered with acute tubercles, bigger dorsal tubercles, parallel row of smaller dorsal ones, 2 small tubercles on top of eyeless ocular lobe, antennal notch marked, pseudorostral lobes meeting a short distance in front of ocular lobe. Pereonites 3–5 with lateral small tubercle. Pleonites 1–5 with pair of dorsal small tubercles, pleonite 5 with constriction at about posterior one-third, armed with 2 or 3 small dorsal tubercles, lateral tubercle on pleonites 1–5, pleonite 6 with 1 or 2 pairs of small dorsal tubercles.

Antenna 1 peduncle with robust articles, with serrated margins, progressively shorter, main flagellum 3-articulate, longer than distal article of peduncle, accessory flagellum 2- articulate, shorter than basal article of main flagellum.

Maxilliped 2 with long plumose setae on inner margin of basis and merus, tooth and plumose seta on inner margin of carpus, propodus second longest article, with long robust distal seta, longer than dactylar teeth, with tooth on inner margin, dactylus with 3 short, robust teeth. Maxilliped 3 basis longer than rest of articles combined, with 2 long plumose setae on outer margin, merus second longest article, with 2 teeth and plumose seta on outer margin, carpus shorter than merus, with teeth on both margins and plumose seta on outer margin, propodus shorter than carpus, with 2 pappose setae on inner margin, dactylus half of propodus length, with short simple setae.

Pereopod 1 with slender articles, basis shorter than rest of articles combined, with plumose seta on inner distal corner, merus second longest article, 2.5 times as long as ischium, with small tooth and plumose seta on outer margin, carpus shorter than merus, propodus shorter than carpus, dactylus 0.6 propodus length, with short simple setae. Pereopod 2 basis less than one-third of entire pereopod length, with tooth and plumose seta on inner margin, merus with tooth and 2 simple setae on inner margin, carpus 1.6 times as long as merus, with stout and simple seta on distal margin, dactylus 3.7 times as long as propodus, with tapering tip and short setae. Pereopods 3–5 with progressively shorter basis and longer carpus, propodus longer than merus, dactylus with long stout terminal seta. Exopods on maxilliped 3 and pereopods 1, 2.

Uropod peduncle 1.8 times as long as pleonite 6, 1.4 times as long as endopod, with strongly serrated margins and longitudinal serrated crest, exopod shorter than endopod, with subterminal stout seta and a terminal longer one, endopod with 3 microserrate setae on inner margin and more robust, longer terminal seta.

Etymology. The species bears the name of type locality – Australia.

Distribution. Tas., off Freycinet Peninsula, 600– 720 m.

Remarks. The closest species to Campylaspis australiensis is C. sagamiensis Gamô, 1967 from Japan. Both species have similar tubercles on the carapace, pereon and pleon, and a lateral sulcus, but in C. sagamiensis the pleon has lateral ridges rather than tubercles; C. sagamiensis also differs in a longer propodus seta, shorter and more robust teeth on the dactylus of maxilliped 2, wider merus and dactylus with shorter terminal setae on maxilliped 3, and shorter more robust uropods.

Similar carapace tubercle patterns around the lateral sulcus also exist on C. clavata Lomakina, 1952 from the north-western Pacific, C. horrida Sars, 1870 from the Atlantic Ocean, C. horridoides Stephensen, 1915 from the Mediterranean and C. antarctica Calman, 1907 from Antarctica. C. clavata differs in having a longer ocular lobe (reaching the extremity of the carapace versus shorter in C. australiensis ), shorter dactylus of pereopod 2 and longer uropod peduncle. C. horrida differs in having a sulcus not surrounded by acute tubercles, pleonite 6 without tubercles and a longer uropod peduncle. C. horridoides differs in fewer dorsal tubercles on the carapace, maxilliped 3 with more teeth on its outer margin and a longer uropod peduncle. C. antarctica differs in being without a lateral sulcus on the carapace and its pleonite 6 being without spines.

Figures

Figure 5. Campylaspis australiensis sp. nov. female holotype: a, body, lateral view; b, body, dorsal view; c, antenna 1; d, maxilliped 2; e, maxilliped 3; f, pereopod 1. Scale (in mm): a, b, 1; c, e, f, 0.25; d, 0.2.

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