Cyclaspis adiastolos, 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 : 3-8

publication ID	https://doi.org/ 10.5281/zenodo.273313
DOI	https://doi.org/10.5281/zenodo.5684558
persistent identifier	https://treatment.plazi.org/id/039B87D7-5355-7847-FEAB-F839FB841746
treatment provided by	Plazi
scientific name	Cyclaspis adiastolos
status	sp. nov.

Treatment

Cyclaspis adiastolos View in CoL sp. nov. ( Figs. 13 View FIGURE 1 View FIGURE 2 View FIGURE 3 )

Type material. Holotype: ov. female, Assaluyeh, north Nay Band Bay, Persian Gulf: stn 20, 52°33.763’N 27°20.193’E, 27 m, November 2002, ( ICM CUM 0041). Allotype: 1 ad. male, stn 5, 52°32.959’N 27°30.292’E, 26 m, August 1998 ( ICM CUM 0042). Paratypes: 2 ov. females (one dissected in two slides), 1 ad. male, stn 15, 52°33.344’N 27°29.421’E, 27 m depth, August 1998 ( ICM CUM 0043); 1 ov. female, stn 15, 52°33.344’N 27°29.421’E, 27 m depth, November 2002 ( ICM CUM 0044); 1 ov. female, stn 20, 52°33.763’N 27°20.193’E, 27 m depth, August 1998 ( ICM CUM 0045).

Diagnosis. Carapace globose with a transversal ridge nearly encircling it and two semicircular dorsolateral tubercles on the hinder fourth. Uropod peduncle as long as pleonite 6, with finely serrate inner margin. Endopod longer than peduncle, with four acuminate setae in middle. Adult male without ridges or carinae on the carapace but with a small protuberance on each side. Uropod peduncle as long as pleonite 6, with finely serrate inner margin. Endopod longer than peduncle, sharply pointed, finely serrated on 1/3 of inner margin and with four acuminate setae in middle.

Description. Ovigerous female 4.15 mm total length. Carapace ( Fig. 1 View FIGURE 1 A, B) slightly longer than 1/3 of total length, globose, with a transversal ridge nearly encircling it; this ridge cross the dorsal line a little behind the middle of carapace and slopes a little forward on each side, not reaching the lateral margin; with a pair of dorsolateral carinae on the hinder fourth not reaching the hinder margin, which is bumped backwards on the dorsal line. Eyelobe narrow, slightly longer than pseudorostral lobes, with corneal lenses. Pereonite 2 with three carinae, one median and two dorsolateral; pereonite 1 and 3 without carinae, pereonite 4 and 5 with a pair of dorsolateral carinae. Five first pleonites with a pair of dorsolateral carinae and a median carina that becomes faint in the pleonite 5.

Antennule ( Fig. 1 View FIGURE 1 C), peduncle triarticulate; article 1 as long as articles 2 and 3 combined length; article 3 longer than article 2; main flagellum biarticulate, with two aesthetascs, accessory flagellum rudimentary.

Mouthparts: mandible ( Fig. 1 View FIGURE 1 D, E) with four teeth on the pars incisiva, 13 setae between pars incisiva and truncated pars molaris. Maxillule ( Fig. 1 View FIGURE 1 F) palp with two unequal filaments, inner endite with five setae, three simple, one trifid and one microsetulate. Maxilla and maxilliped 1 lost during dissection. Maxilliped 2 ( Fig. 1 View FIGURE 1 G) basis as long as the rest of appendage, with a long plumose seta on inner distal corner; carpus longer than merus, with four plumose setae on inner margin. Maxilliped 3 ( Fig. 2 View FIGURE 2 A), basis expanded distally over merocarpal articulation; ischium with four plumose setae on inner margin; merus produced distally reaching the carpopropodial articulation with a plumose seta on its tip.

Pereopods: pereopod 1 ( Fig. 2 View FIGURE 2 B), basis longer than ischium, merus and carpus combined length; merus as long as 2/3 of carpus; propodus longer than carpus; dactylus of the same length than carpus. Pereopod 2 ( Fig. 2 View FIGURE 2 C), basis shorter than the rest of appendage, with three long plumose setae; ischium short; merus twice as long as carpus; dactylus three times as long as propodus. Pereopod 3 ( Fig. 2 View FIGURE 2 D), basis slightly longer than the rest of appendage, with two plumose setae on distal half; ischium half length of merus; merus and carpus of same length; carpus and propodus with two and one long setae on distal corner respectively. Pereopod 4 and 5 ( Fig. 2 View FIGURE 2 E, F), basis shorter than rest of appendage; merus and carpus of the same length.

Uropod peduncle as long as pleonite 6 ( Fig. 2 View FIGURE 2 G), with finely serrate inner margin. Endopod longer than peduncle, sharply pointed, finely serrated on 1/3 of inner margin and with four acuminate setae in middle. Exopod shorter than endopod, with two distal acuminate seta and three setae on inner margin.

Adult male 4.75 mm total length. Carapace ( Fig. 3 View FIGURE 3 A, B) 1/3 of total length, without ridges or carinae but with a small protuberance on each side. Pleonites without carinae. Uropod peduncle longer than pleonite 6 ( Fig. 3 View FIGURE 3 C), with about twenty long plumose or microsetulate setae; endopod shorter than peduncle with eleven microsetulate setae on inner margin; exopod 2segmented, shorter than endopod with six acuminate setae on inner margin and two setae distally.

Etymology. Greek word meaning not separated, confused, referring its great resemblance with C. cingulata , which we were firstly confused with.

Remarks. Although the great resemblance of C. adiastolos sp. nov. with C. cingulata Calman, 1907 , the study of the type material of the latter (ZMK CRU6038, CR9163, CRU9164) clarified their differences. In C. cingulata the transversal ridge encircle entirely the carapace and clearly separates it in two parts, even on the middorsal line. Near the lower margin, this ridge curves forward reaching the margin, as well as in specimen figured by Calman (1907: pl. 4, figs. 1, 2). In C. adiastolos the transversal ridge is interrupted on the middorsal line and does not reach the lower margin of the carapace.

Moreover, C. cingulata has two dorsal parallel carinae on the posterior third of carapace, which are reduced to a two semicircular tubercles in C. adiastolos .