Campylaspis latimera, 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 : 140-142

Campylaspis latimera sp. nov.

Figures 16–19

Material examined. Holotype subadult 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 J52935.

Allotype: male (stn SLOPE 45 ), NMV J52936.

Paratypes: 2 females, 1 manca (stn SLOPE 1 ), NMV J52937 ; 1 female (stn SLOPE 1 ) MGAB CUM 1609 ; 1 immature male (stn SLOPE 46 ), NMV J52938 ; 1 immature male, NMV J45784; 1 female, 1 immature male (stn SLOPE 48 ), NMV J52939 .

Diagnosis. Carapace with a large lateral sulcus, small ocular lobe without eyes. Maxilliped 3 with large concave merus. Pereopod 1 with large merus. Pereopod 2 with long dactylus (3.8 times as long as propodus). Pereopods 3–5 dactylus fused with its terminal seta. Uropod peduncle 3 times as long as pleonite 6 and 2.8 times as long as endopod.

Description of female. Body with calcified, smooth integument. Length: 6.8 mm.

Carapace 0.44 body length, 1.7 times as long as high, large lateral sulcus occupying most of lateral side of carapace (0.7 of its length), ocular lobe small, acute, without eyes, antennal notch small, ventral margin smooth. Pleonites each with toothed posterior margin.

Antenna 1 basal article of peduncle the longest, distal one the shortest, main flagellum shorter than last article of peduncle, 3-articulate, accessory flagellum tiny, uniarticulate.

Maxilliped 3 basis more than half length of appendage, serrated inner margin with 2 plumose apical setae, 2 longer plumose setae on outer corner (not produced), ischium with strong tooth on inner margin, merus large and concave, produced with small tooth, serrated outer margin with plumose seta, carpus shorter than merus, with serrated outer margin and plumose seta, propodus shorter than carpus, with numerous inner plumose setae, dactylus half of propodus, with setae as long as article.

Pereopod 1 basis more than half length of appendage, serrated inner margin with 2 simple setae and long pappose seta on inner distal corner, 2 plumose setae on outer margin, ischium with pappose seta on serrated inner margin, merus large, second longest article, 3 simple setae on serrated inner margin and 2 plumose setae and spine on outer margin, carpus large with serrated margins with simple setae on inner margin and plumose on outer margin, shorter than merus, propodus shorter and thinner than carpus, with numerous plumose setae on outer margin, dactylus 0.5 of propodus, with short simple setae. Pereopod 2 basis less than half length of appendage, simple seta on inner margin of merus, 2 unequal simple setae on outer distal corner, dactylus 3.8 times as long as propodus, with plumose setae on inner margin and simple seta on outer margin, subterminal and terminal simple setae. Pereopods 3–5 with progressively shorter basis and longer carpus (twice as long as merus), dactylus fused with terminal stout seta. Exopods on maxilliped 3 and pereopods 1, 2.

Uropod peduncle 3 times as long as pleonite 6 and 2.8 times as long as endopod, serrated inner margin without setae, exopod slightly shorter than endopod, with subterminal simple stout setae, endopod with 4 microserrate setae on inner margin, terminal robust seta shorter than endopod.

Description of male. Body with numerous long simple setae on posterior margin of pereonites and of pleonites 1–4. Length: 6.5 mm. Carapace less vaulted than in female, lateral sulcus smaller, anteroventral corner serrated. Pleonites with lateral groove for protecting the flagellum of antenna, provided with stout setae on its margins keeping flagellum within groove.

Antenna 1 shorter than in female, main flagellum of 3 articles, 1 aesthetasc on articles 2–3. Accessory flagellum tiny, uniarticulate. Maxilliped 3 with similar merus but thinner propodus than in female.

Pereopod 1 as in female. Pereopod 2 basis larger, plumose seta on inner margin of merus, carpus with plumose seta on inner distal corner, dactylus 3.5 times as long as propodus, as in female. Pereopods 3 and 4 basis broad, longer carpus in pereopod 4 (twice as long as merus), dactylus with stout terminal seta. Pereopod 5 carpus second longest article, little longer than in pereopod 4.

Uropod peduncle 3.35 times as long as pleonite 6, longer than in female, 2.65 times as long as endopod, rami little longer than in female, numerous plumose setae on serrated inner margin and a median groove for antenna provided with a lateral row of stout setae and a parallel one with plumose setae, exopod 0.8 length of endopod, with short subterminal stout seta, inner plumose seta and terminal stout long seta (longer than exopod), endopod with 9 microserrate long setae on inner margin and a terminal robust seta shorter than endopod.

Etymology. The species is named “ latimera ” because of the large merus of its maxilliped 3 and pereopod 1.

Distribution. Off Nowra, NSW, off Freycinet Peninsula, Tas.; 204–720 m depth.

Remarks. Campylaspis latimera differs from other species from this area with a lateral sulcus on the carapace by the characteristic shape and large size of the merus of the first pereopod. Maxilliped 3 also has a large merus with a concave inner margin and a large carpus. Both features are present in males and females. C. anae also has a large merus and carpus of maxilliped 3 but without the concavity of the merus; pereopod 1 of this species has slender articles. Also, the merus and carpus of maxilliped 3 of C. rectangulata are large, the merus with an inner concavity but not as evident as in C. latimera and pereopod 1 has only moderately large articles. Campylaspis microdentata Ledoyer, 1988 from off Comore Is. has a similar merus to maxilliped 3 but the carapace has no lateral sulcus and pereopod 1 has slender articles, shaped normally.

Figures

Figure 16. Campylaspis latimera sp. nov. female paratype: a, body, lateral view; b, carapace, dorsal view; c, fifth pleonite; d, antenna 1; e, maxilliped 3. Scale (in mm): a, b, 1; c, 0.25; d, 0.25; e, 0.5.

Figure 17. Campylaspis latimera sp. nov. female paratype: a, pereopod 1; b, pereopod 2; c, pereopod 3; d, pereopod 4; e, pereopod 5; f, pleonite 6 and left uropod. Scale (in mm): a–f, 0.5.

Figure 18. Campylaspis latimera sp. nov. male paratype: a, body, lateral view; b, pleonite, magnified; c, antenna 1; d, its flagella, magnified; e, maxilliped 3; f, pereopod 1. Scale (in mm): a, 1; b, c, 0.25; d, 0.1; e, f, 0.5.

Figure 19. Campylaspis latimera sp. nov. male paratype: a, pereopod 2; b, pereopod 3; c, pereopod 4; d, pereopod 5; e, pleonite 6 and left uropod; f, detail of uropodal peduncle, magnified. Scale (in mm): a–e, 0.5; f, 0.25.