Pseudosympodomma persicum, 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 : 21-25

Pseudosympodomma persicum sp. nov. ( Figs. 12­14 )

Type material. Holotype, ov. female, Assaluyeh, north Nay Band Bay, Persian Gulf, stn 14, 52°33.591’N 27°29.677’E, 19 m depth, August 1998 ( ICM CUM­ 0047). Allotype: 1 ad. male, stn 18, 52°33.244’N 27°29.406’E, 16 m, November 2002 ( ICM CUM­ 0048). Paratypes: 2 pread. females, 1 pread. male, same station of holotype ( ICM CUM­ 0049); 1 ov. female partially dissected in two slides, stn 19, 52°34.003’N 27°29.156’E, August 1998, 19 m depth, ( ICM CUM­ 0050); 1 ov. female, stn 24, 52°34.168’N 27°28.797’E, 18 m, August 1998, ( ICM CUM­ 0051).

Other material examined. Campaign 1998: 1 pread. female, stn 9, 52°33.323’N 27°30.064’E, 21 m depth; 1 pread. female, 1 juvenile, stn 1 8, 52 °33.244’N 27°29.406’E, 16 m depth; 1 pread. female, 1 imm. male, stn 23, 52°34.429’N 27°29.065’E, 14 m depth.

Campaign 2002: 1 ad. male (without abdomen), stn 4, 52°33.207’N 27°30.560’E, 21 m depth; 1 ad. male, stn 9, 52°33.323’N 27°30.064’E, 21 m depth; 1 pread. male, 2 juveniles, stn 13, 52°33.831’N 27°29.948’E, 15 m depth; 1 pread. female, stn 14, 52°33.591’N 27°29.677’E, 19 m depth; 1 ov. female, 1 pread. female, stn 18, 52°33.244’N 27°29.406’E, 16 m depth; 2 ov. females, 1 pread. female, 1 pread. male, 2 juveniles, stn 24, 52°34.168’N 27°28.797’E, 18 m depth.

Diagnosis. Dorsal median carina of the carapace with three teeth directed forwards occupying more than half of dorsal margin in females; dorsal median carina paired on the hinder third of the carapace and on pereonites 2­5. Anterolateral angle rounded and lower margin smooth.

Description. Ovigerous female, 9.25 mm total length. Carapace slightly more than a 1/5 of total length ( Fig. 12 A); dorsal median carina with three teeth directed forwards occupying more than half of dorsal margin, the most anterior tooth the smallest, with a rounded tip in the holotype (this tooth is more acute in preadult females); dorsal median carina paired on the hinder third of the carapace. Eye­lobe narrow and linguiform reaching beyond the pseudorostral lobes; antennal notch shallow, anterolateral angle rounded and lower margin smooth. Pereon as long as the carapace, all pereonites visible laterally and dorsally; pereonite 1 the shortest, pereonites 2­5 with a paired dorsal median carina.

Antennule ( Fig. 12 B), peduncle triarticulate, article 1 as long as the other two combined length, article 2 and 3 of the same length; accessory flagellum biarticulate, main flagellum biarticulate with two aesthetascs and a long simple seta distally.

Mouthparts: mandible ( Fig. 12 D) with 17 setae between pars incisiva and truncated pars molaris. Maxillule ( Fig. 12 E, F), palp with two unequal filaments, inner endite with five setae: one forked, one microsetulate and three acuminate; outer endite with serrate and setulate setae. Maxilla ( Fig. 12 G), endites exceding the protopod, with simple and serrate setae. Maxilliped 1 ( Fig. 12 H), basis with eight plumose setae on inner margin, its endite with two retinacula, two broad multicuspidate, two plumose and some simple setae; carpus with eight flattened hand­like seta on inner margin. Maxilliped 2 ( Fig. 13 A), basis longer than rest of appendage, with four plumose setae on distal inner corner; carpus as long as ischium and merus combined length, with nine setae on inner margin and one long plumose seta on the distal outer corner. Maxilliped 3 and pereopods 1 and 2 with well developed exopods. Maxilliped 3 ( Fig. 13 B), basis 1.5 times as long as the rest of appendage, distally produced reaching the end of merus, with a row of plumose setae on the inner margin and two long plumose setae at the tip of projection; ischium shorter than merus, with four plumose setae on inner margin; merus slightly produced distally.

Pereopods: pereopod 1 ( Fig. 13 C), basis shorter than rest of appendage, with three small acuminate setae on the inner margin; ischium half length of merus; propodus as long as merus and carpus combined length; dactylus slightly longer than merus. Pereopod 2 ( Fig. 13 D), basis shorter than the rest of appendage; ischium very short with one long plumose seta; merus near as long as the carpus, both with acuminate setae on distal margin; dactylus longer than two preceding articles, with three small acuminate setae proximally and four setae terminally, being the longest half length of dactylus. Pereopod 3 ( Fig. 13 E), basis longer than rest of appendage with some plumose setae on the margin and one on the distal corner; merus shorter than carpus, with one simple seta on distal corner; carpus with three long simple setae on distal corner; propodus half length of carpus, with one long simple seta distally. Pereopods 4 and 5 similar ( Fig. 13 F, G), basis shorter than following three articles combined length, with plumose and simple setae; merus shorter than carpus; carpus with three long simple setae on distal corner; propodus less than 1/3 of carpus.

Uropod peduncle 1.3 as long as endopod ( Fig. 13 H), with 29 acuminate setae on the inner margin. Endopod biarticulate, longer than exopod; article 1 longer than article 2, with ten acuminate setae on inner margin and eight setae on the outer margin; article 2 with ten acuminate setae on the inner margin, seven on the outer margin and one distally. E xopod article 2 with 12 acuminate setae on the outer margin, a row of plumose setae on inner margin and three long acuminate setae distally.

Adult male, 9.3 mm total length. Carapace 1.75 as long as high ( Fig. 14 A, B), with paired middorsal carina running from behind frontal lobe to posterior margin of carapace. Antero­lateral angle rounded and lower margin smooth. Pereonites 2­5 with paired middorsal carina.

Uropod peduncle longer than rami with more than 40 acuminate and microsetulate setae ( Fig. 14 C). Endopod biarticulate, slightly longer than exopod; article 1 longer than article 2, with 18 acuminate and ten microsetulate setae on inner margin and 11 simple setae on outer margin; article 2 with 16 acuminate setae on inner margin, seven simple setae on outer margin and two long acuminate setae terminally. Exopod biarticulate, article 2 with 11 long plumose setae on inner margin, 14 simple setae on outer margin and four microsetulate setae terminally.

Etymology. Referring the type locality.

Remarks. Pseodosympodomma persicum sp. nov. is related with P. africanum (Stebbing, 1912) and P. hoinicae Petrescu, 1998 in having the article 1 of the uropod endopod longer article 2, but differs from the P. africanum by the smooth lower margin of the carapace and from P. hoinicae by a greater number of setae on the uropods. Moreover, P. persicum has the dorsal median carina of the female paired on the hinder third of the carapace while it is single in the other two species. This last feature is of high relevance in the differentiation of species of this genus ( Corbera & Martin 2002).

Figures

FIGURE 12. Pseudosympodomma persicum sp. nov., adult female. A, whole animal in lateral view; B, antennule; C, right mandible; D, tip of the left mandible; E, maxillule; F, enlarged tip ofmaxillule; G, maxilla; H, maxilliped 1. Scale bar: A = 1 mm; B, C, E, G, H = 0.2 mm; D, F = 0.1 mm.

FIGURE 13. Pseudosympodomma persicum sp. nov., adult female. A, maxilliped 2; B maxilliped 3; C, pereopod 1; D, pereopod 2; E, pereopod 3; F, pereopod 4; G, pereopod 5; H, uropod.

FIGURE 14. Pseudosympodomma persicum sp. nov., adult male. A, carapace and pedigerous somites in lateral view; B. carapace and pedigerous somites in dorsal view; C, uropod.