Campylaspis halei, 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 : 138-139

Campylaspis halei sp. nov.

Figures 12 , 13

Material examined. Holotype female, Tas., off Freycinet Peninsula, 41°57.50'S, 148°37.90'E, 400 m, coarse shell, WHOI epibenthic sled, M.F. Gomon et al., RV Franklin, 27 July 1986 (stn SLOPE 48 ), NMV J52940.

Allotype male: (stn SLOPE 48 ), NMV J52941.

Paratypes: 2 females, 1 immature male, 2 mancas (stn SLOPE 1 ), NMV J52943 ; 2 females (stn SLOPE 47 ), NMV J52416 ; 2 females (stn SLOPE 47 ), MGAB CUM 1608 ; 3 females, 1 female, dissected (stn SLOPE 48 ), NMV J52942 ; 1 female (stn SLOPE 19 ), NMV J52420 .

Diagnosis. Carapace with a small lateral sulcus. Accessory flagellum of antenna 1 2-articulate. Maxilliped 2 with subequal dactylar teeth. Merus of maxilliped 3 massive, merus, carpus and propodus with teeth on inner margin. Dactylus of pereopod 2 2.8 times as long as propodus, with a digitiform extremity. Uropod peduncle twice as long as pleonite 6 and its endopod, exopod 0.8 length of endopod, endopod with 5 microserrate setae on inner margin.

Description of female. Body with calcified smooth integument. Length: 3.2 mm.

Carapace 0.45 length of entire body, with a small lateral sulcus, large ocular lobe without lenses, antennal notch distinct, anteroventral corner acute, ventral margin smooth. Pleon 0.36 body length.

Antenna 1 peduncle with serrated margins, distal article longer than median one, main flagellum 3-articulate, longer than last article of peduncle, basal article longer than rest of articles combined, accessory flagellum tiny, 2-articulate.

Maxilliped 2 basis fused with ischium, with plumose seta on inner distal corner, merus with similar seta medially, carpus with tooth and 2 long simple setae on inner margin, propodus second longest article, with robust outer seta longer than dactylar teeth, dactylus with 3 subequal teeth.

Maxilliped 3 basis less than half as long as appendage, with plumose seta on inner distal corner and longer 1 on outer corner, inner distal corner of ischium with robust seta, merus second longest article, longer than carpus, propodus and dactylus combined, with row of teeth on inner margin and plumose seta on outer distal corner, carpus shorter than propodus, with serrated inner margin and plumose seta on outer distal corner, propodus with teeth on both margins, dactylus shorter than propodus, with terminal simple setae.

Pereopod 1 basis shorter than one-third of appendage length, with 2 plumose setae on inner margin, numerous plumose setae on inner margins of ischium to propodus, merus second longest article, carpus longer than propodus, propodus longer than dactylus, dactylus with simple setae. Pereopod 2 basis more than one-third length of appendage, plumose seta on inner distal corner of basis, ischium and merus, carpus twice as long as merus, with short stout seta, simple and plumose setae on inner distal corner, dactylus 2.8 times as long as propodus, digitiform dactylus tip with subterminal short simple seta. Pereopods 3–5 with progressively shorter basis and longer carpus, carpus and propodus with simple stout seta on outer distal corner, dactylus with stout terminal seta. Exopods on maxilliped 3 and pereopods 1, 2.

Uropod with serrated margins, peduncle twice pleonite 6, exopod shorter than endopod, with terminal robust seta shorter than exopod, endopod half peduncle length, with robust terminal seta and 5 microserrate setae on inner margin.

Description of immature male. Body length: 2.8 mm. Carapace less vaulted than in female, with similar sulcus. Antenna 2, pereopods 1–4 and exopods characteristic of an immature stage.

Uropod peduncle with less serrated margins, more slender and proportionally longer than in females, 2.3 times pleonite 6, rami longer than in females, endopod 0.77 peduncle length, rami equal, exopod with smooth margins, endopod with 5 stout setae on inner serrated margin.

Etymology. The species is dedicated to the memory of Herbert Mathew Hale (1895–1963), former director of the South Australian Museum (1928–1960), one of the most important specialists of Cumacea . He described most of the cumacean taxa known from Australian waters.

Distribution. NSW, off Freycinet Peninsula, Tas.; 400–600 m depth.

Remarks. Campylaspis halei has a smooth carapace surface with a relatively small lateral sulcus, extending over about half of the carapace. It resembles C. latidactyla Hale, 1945 but with a different extremity of the dactylus of pereopod 2 (digitiform tip in C. halei ). Its sulcus is smaller than in C. minor Hale, 1945 , where it is largely opened towards the anterior margin, and has a marked antennal notch absent in Haleʼs species (which has a much smaller size). C. halei is also similar to C. latimera , a species with a characteristic large merus on pereopod 1 and to C. poorei which has a narrower sulcus, slender pereopods 1 and 2 and a straight tip on the dactylus of pereopod 2 (digitiform in C. halei ).

Figures

Figure 12. Campylaspis halei sp. nov. female paratype: a, body, lateral view; b, carapace, dorsal view; c, antenna 1; d, maxilliped 2; e, maxilliped 3; f, pereopod 1. Scale (in mm): a, b, 0.5; c, 0.1; d, 0.1; e, f, 0.25.

Figure 13. Campylaspis halei sp. nov. female paratype: a–e, male f–h: a, pereopod 2; b, pereopod 3; c, pereopod 4; d, pereopod 5; e, pleonite 6 and left uropod; f, body, lateral view; g, carapace, dorsal view; i, pleonite 6 and right uropod. Scale (in mm): a, e, h, 0.25; b–d, 0.5; f, g, 0.5.