Cyclaspis dictyota, 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 : 231-233

CYCLASPIS DICTYOTA SP. NOV. ( FIGS 6 , 7 )

Type material: Holotype: preadult female partially dissected in one slide, New Caledonia, BIOCAL, stn DS59, 23°56.21′S, 166°41.10′E, 2650 m, 2.ix.1985 (MNHN-Cu1080).

Diagnosis: Carapace globose covered by small granules, which show a reticulate pattern that disappear near the margins; pseudorostral lobes meeting just in front of the eyelobe. Uropods shorter than pleonite 6; rami slightly longer than peduncle.

Description: Preadult female 10.2 mm total length. Carapace ( Fig. 6A ) slightly shorter than one-third total length, globose, covered by small granules that draw a reticulate pattern that disappears near the margins. Eyelobe small and triangular, not reaching the tip of pseudorostrum. Reticulations are also slightly visible dorsally on thoracic segments.

Antennule ( Fig. 6B ), peduncle article 1 wider than article 2 and shorter than combined length of articles 2 and 3; article 3 longer than article 2; main flagellum 2-articulate, with two aesthetascs and a long simple seta terminally, accessory flagellum rudimentary. Mouth appendages not dissected in order to preserve holotype.

Maxilliped 1 basis ( Fig. 6C ), distally produced reaching carpus, with a plumose seta on the projection; carpus with six bi-dentate flattened setae on distal half of inner margin and a long pappose seta on distal outer corner. Maxilliped 2 ( Fig. 6D ) basis longer than rest of appendage, with three pappose setae on distal inner corner and a row of ten pappose setae on distal third of outer margin; carpus longer than merus, with five plumose and one simple setae on inner margin and a long plumose seta on distal outer corner; propodus with two long pappose setae on outer margin. Maxilliped 3 ( Fig. 7A ), basis more than twice as long as rest of appendage, expanded distally over mero-carpal articulation, with seven plumose setae on inner margin of projection and two longer on the tip; ischium as wide as long, with a small plumose seta on inner margin; merus produced distally nearly reaching the carpo-propodial articulation with a plumose seta on its tip. Pereopod 1 ( Fig. 7B ), basis twice as long as the following three segments combined; ischium and merus of similar length; carpus longer than combined length of ischium and merus; propodus and dactylus lost. Pereopod 2 ( Fig. 7C ), basis slightly longer than rest of appendage; ischium short; merus twice as long as ischium, with a simple seta distally; carpus of similar length to merus, with two cuspidate setae on distal corner; propodus shorter than carpus; dactylus nearly twice as long as propodus. Pereopod 3 ( Fig. 7D ), basis longer than rest of appendage, with a plumose seta on distal margin; ischium half length of merus; carpus as long as merus with two simple setae distally; propodus with a long seta on distal corner. Pereopod 4 ( Fig. 7E ), basis longer than rest of appendage; merus and carpus of same length; carpus and propodus with two and one long simple setae on distal corner, respectively. Pereopod 5 ( Fig. 7F ), basis shorter than rest of appendage; ischium with a simple seta; merus and carpus of same length; carpus and propodus both with one long simple seta on distal corner.

Uropod ( Fig. 6E ) shorter than pleonite 6, with few denticulations on distal inner corner. Rami (both broken at tip) slightly longer than peduncle. Endopod 1-articulate, inner margin crenulate.

Etymology: From the Greek diktyotos, meaning reticulate, referring to the sculpture of the carapace. Remarks: By the sculpture of the carapace C. dictyota resembles C. reticulata Roccatagliata, 1985 . However, C. dictyota is larger (10.2 vs. 2.1–2.5 mm) and has the uropods shorter than pleonite 6.

Figures

Figure 6. Cyclaspis dictyota sp. nov. preadult female holotype: A, whole animal in lateral view; B, antenna 1; C, maxilliped 1; D, maxilliped 2; E, uropod.

Figure 7. Cyclaspis dictyota sp. nov. preadult female holotype: A, maxilliped 3; B, pereopod 1; C, pereopod 2; D, pereopod 3; E, pereopod 4; F, pereopod 5.