Eocuma carinocurvum, Corbera, Jordi, Tirado, Paula & Martin, Daniel, 2005

Corbera, Jordi, Tirado, Paula & Martin, Daniel, 2005, Cumaceans (Crustacea: Peracarida) from the Persian Gulf, Zootaxa 1087, pp. 1-31 : 8-9

Eocuma carinocurvum sp. nov. ( Fig. 4 , 5 )

Type material. Holotype: ov. female, partially dissected in two slides, Assaluyeh, north Nay Band Bay, Persian Gulf, stn 20, 52°33.763’N 27°20.193’E, 27 m, November 2002 ( ICM CUM­ 0046).

Diagnosis. Carapace strongly flattened with a sharp marginal carina bearing a pair of blunt horns not forward curved, with a pair of dorsal carinae on the posterior half of carapace, running more or less parallel to the middorsal line in its anterior half, but curved to the lateral margin before reaching hinder edge of carapace. Eye­lobe rounded, with three lenses. Uropod peduncle shorter than half length of rami, with five plumose setae on inner margin; endopod subequal to exopod,

Description. Ovigerous female, 9.0 mm total length. Carapace ( Fig. 4 A­C) as long as 1/3 total length, strongly flattened, with a sharp marginal carina bearing a pair of blunt horns not forward curved; dorsal median carina runs from behind of eye­lobe to hinder margin; a pair of dorsal carinae on the posterior half of carapace, running more or less parallel to the middorsal line in its anterior half, but curved to the lateral margin before reaching hinder edge of carapace. Eye­lobe rounded, with three lenses; pseudorostral lobes short and wide, meeting in front the eye­lobe.

Antennule ( Fig. 4 D), peduncle triarticulate; article 1 flattened, broader at base; article 2 and 3 cylindrical; main flagellum biarticulate and with two aesthetascs, accessory flagellum rudimentary.

Mouthparts not dissected in order to preserve de holotype. Maxilliped 3 opercular ( Fig. 5 A), basis flattened and strongly produced distally; ischium longer than merus with seven plumose setae on inner margin; merus produced distally; carpus with distal inner corner acutely produced; dactylus slender and longer than propodus.

Pereopods: pereopod 1 ( Fig. 5 B), basis flattened and expanded centrally, slightly longer than following three segments combined length, with an acute process distally; merus half length of carpus; propodus shorter than merus and as long as dactylus. Pereopod 2 very small ( Fig. 5 C), basis shorter than the rest of appendage, with four long plumose setae; ischium absent; merus, carpus and propodus similar in length; dactylus twice as long as propodus. Pereopod 3 ( Fig. 5 D), basis shorter than the rest of appendage, with four long plumose setae; merus longer than carpus; carpus with four long simple setae, two of them distally; propodus with a long simple seta distally. Pereopods 4 and 5 similar ( Fig. 5 E, F), basis shorter than the rest of appendage, with long plumose setae; merus longer than carpus; carpus with two simple seta on the margin and two long simple setae distally.

Uropod peduncle shorter than half length of rami ( Fig. 5 G), with five plumose setae on inner margin; endopod subequal to exopod, with 19 long plumose and three acuminate setae on inner margin and one terminal; exopod biarticulate, proximal article half length of distal one, which has simple setae on inner margin and one acuminate microsetulate seta distally.

Etymology. Referring to the shape of the pair of dorsal carinae of the carapace.

Remarks. Eocuma carinocurvum sp. nov. resembles E. hilgendorfi Marcusen, 1894 by: carapace dorsoventrally flattened, the entire border carinae, the paired dorsal ridges and the eye­lobe with three lenses. Both species may be distinguished by the shape of dorsal carinae, which are more or less parallel and reaching the hinder margin of the carapace in E. hilgendorfi while they are curved to the lateral margin in E. carinocurvum , and the shape of the lateral horns that are acute and forward directed in E. hilgendorfi . Kurian and Radhadevi (1983) described E. striata only by comparison with E. sanguinea without illustrations. Although E. striata has a pair of dorsal carina, it lacks lenses on the eye­lobe and the width of the posterior margin of carapace is a third of those measured across the horns.

Figures

FIGURE 4. Eocuma carinocurvum sp. nov., adult female, holotype. A, whole animal in lateral view; B, dorsal view of the carapace; C, ventral view of the carapace; D, antennule.

FIGURE 5. Eocuma carinocurvum sp. nov., adult female, holotype. A, maxilliped 3; B, pereopod 1; C, pereopod 2; D, pereopod 3; E, pereopod 4; F, pereopod 5; G, uropod.