Cyclaspis magna, Corbera, 2008

Corbera, Jordi, 2008, Deep-sea Bodotriidae (Crustacea: Cumacea) from New Caledonia, Fiji and Indonesia, Zoological Journal of the Linnean Society 152 (2), pp. 227-254 : 237-241

CYCLASPIS MAGNA SP. NOV. ( FIGS 11 , 12 )

Type material: Holotype: adult male partially dissected in one slide, Arafura Sea , east of Tanimbar Island, Indonesia, KARUBAR, stn DW49, 08°00′S, 132°59′E, 206–210 m, 29.x.1991 (MNHN-Cu1085).

Diagnosis: Carapace nearly twice as long as high, with mid-dorsal carina paired on hind half and a transverse carina behind frontal lobe running down near lateral margin and ending in an acute tubercle. Eyelobe elongate reaching the tip of pseudorostrum; without a postocular tubercle. Uropod peduncle nearly twice as long as pleonite 6; rami half uropod length.

Description: Adult male 16.5 mm total length. Carapace ( Fig. 11A, B ) one-third total length, twice as long as high, with mid-dorsal carina paired on hind half and a transverse carina behind frontal lobe running down to near lateral margin and ending in an acute tubercle. Eyelobe long and narrow reaching the tip of pseudorostrum. Antennal notch deep. Pereonite 4 with a mid-dorsal carina, pereonite 5 with a pair of dorsolateral carinae that end in an acute tooth. Plenonites 1–4 with a pair of dorsolateral carinae ending in acute tooth; pleonite 5 with a pair of dorsolateral carina on anterior half.

Antennule ( Fig. 11C ), peduncle article 1 longer than combined length of articles 2 and 3; article 3 shorter than article 2; main flagellum 2-articulate, with four aesthetascs (three on article 1 and a larger one terminally), accessory flagellum rudimentary. Flagellum of antenna 2 longer than body. Mouth appendages not dissected in order to preserve the holotype.

Maxilliped 1 ( Fig. 11D ) basis with nine plumoserrate setae on inner margin, distally produced reaching carpus; carpus with seven hand-like flattened setae on the inner margin and a long plumose seta on distal outer corner. Maxilliped 2 ( Fig. 11E ) basis longer than rest of appendage, with three plumose setae on distal margin and nine simple setae on outer margin; carpus longer than merus, with pappose setae on inner margin and a long pappose seta on distal outer corner. Maxilliped 3 ( Fig. 12A ), basis more than twice as long as rest of appendage, expanded distally over mero-carpal articulation, with a row of plumose setae on outer margin and on inner margin of projection, with a depression on the central part, where basis of pereopod 1 is lodged; merus produced distally reaching the carpo-propodial articulation; carpus as long as broad. Pereopod 1 ( Fig. 12B ), basis shorter than rest of appendage, with a plumose seta on distal corner; merus twice as long as ischium; carpus shorter than propodus; dactylus half length of propodus with simple setae on the margin and terminally. Pereopod 2 ( Fig. 12C ), basis shorter than rest of appendage, with a row of long pappose setae on margin; ischium short with a long pappose seta; merus longer than carpus, with three long pappose setae on distal margin; carpus longer than propodus, with a long, simple seta on distal corner; dactylus twice as long as propodus, with three cuspidate setae terminally and one on margin. Pereopod 3 ( Fig. 12D ), basis slightly longer than rest of appendage, with five long pappose setae on anterior margin, a row of small ones on posterior margin and two setae distally; ischium with two simple setae on distal margin; merus more than twice as long as ischium; carpus shorter than merus with a long, simple seta on margin and other on distal corner; propodus with a seta on distal corner. Pereopod 4 ( Fig. 12E ), basis as long as rest of appendage, with long pappose setae on anterior and posterior margins; ischium short, with a simple seta on distal corner; merus longer than carpus; carpus and propodus with two and one long simple setae on distal corner, respectively. Pereopod 5 ( Fig. 12F ), basis shorter than rest of appendage, with long pappose setae on margin; merus and carpus of similar length; carpus with three simple setae on margins and a longer one on distal corner; propodus shorter than carpus, with a long simple seta on distal corner.

Uropod peduncle ( Fig. 12G ) nearly twice as long as pleonite 6, with a row of long setae (27 plumose and the last three serrate) on inner margin; endopod half peduncle length, with 16 serrate and six long plumose setae on inner margin; exopod as long as endopod with plumose setae on inner margin.

Etymology: From Latin magnus, meaning large, referring the size of the specimen.

Remarks: Cyclaspis magna seems to belong to the sculpta group, males of which are markedly dissimilar from the females, having a carapace that is more elongate with less developed tubercles and ridges ( Hale, 1928, 1944). C. magna resembles C. tribulis Hale, 1928 , C. cana Hale, 1944 and C. mawsonae Hale, 1944 but differs from them by the presence of a mid-dorsal paired carina, the lack of dorsolateral tubercles and the uropod length, which is twice as long as rami. C. munda Hale, 1944 and C. pruinosa Hale, 1944 also lack dorsolateral tubercles, but neither has the mid-dorsal paired carina. Finally, C. indoaustralica Bacescu, 1992 , which closely resembles C. magna , has a greater number of oblique

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Figures

Figure 11. Cyclaspis magna sp. nov. adult male holotype. A, whole animal in lateral view; B, carapace in dorsal view; C, antenna 1; D, maxilliped 1; E, maxilliped 2.

Figure 12. Cyclaspis magna sp. nov. adult male holotype. A, maxilliped 3; B, pereopod 1; C, pereopod 2; D, pereopod 3; E, pereopod 4; F, pereopod 5; G, uropod.