Eocuma travancoricum Kurian, 1951

Corbera, Jordi, Tirado, Paula & Martin, Daniel, 2005, Cumaceans (Crustacea: Peracarida) from the Persian Gulf, Zootaxa 1087, pp. 1-31 : 11-13

Eocuma travancoricum Kurian, 1951 ( Figs. 6­8 )

Eocuma travancoricum Kurian, 1951: 97 ­99, pl. 2, fig. 21­28.

Material examined. Assaluyeh, north Nay Band Bay, Persian Gulf. Campaign 1998: 1 ov. female, 1 pread. male, stn 3, 52°33.464’N 27°30.828’E, 19 m depth; 1 pread. female, stn 4, 52°33.207’N 27°30.560’E, 21 m depth; 1 pread. female, 1 pread. male, stn 8, 52°33.574’N 27°30.229’E, 19 m depth; 1 pread. female, 2 ov. females, 1 pread. male, stn 9, 52°33.323’N 27°30.064’E, 21 m depth; 1 ov. female, stn 13, 52°33.831’N 27°29.948’E, 15 m depth; 3 pre ad. females, 5 ov. females, 2 pread. males, 2 juv., stn 14, 52°33.591’N 27°29.677’E, 19 m depth; 1 pread. female, 5 ov. females, 1 manca, stn 18, 52°33.244’N 27°29.406’E, 16 m depth; 2 pread. females, 7 ov. females, 1 ad. male, 1 juv., stn 19, 52°34.003’N 27°29.156’E, depth 19 m, 1 ov. female, stn 20, 52°33.763’N 27°20.193’E, 27 m depth; 6 ov. females, 2 pread. males, stn 23, 52°34.429’N 27°29.065’E, 14 m depth; 4 pread. females, 3 ov. females stn 24, 52°34.168’N 27°28.797’E, 18 m depth.

Campaign 2002: 2 ov. females, 2 pread. females, 1 pread. males, 1 juv., stn 3, 52°33.464’N 27°30.828’E, 19 m depth; 2 ov. females, 1 ad. male, stn 4, 52°33.207’N 27°30.560’E, 21 m depth; 2 ovi. females, 1 ad. male, stn 9, 52°33.323’N 27°30.064’E, 21 m depth; 6 ovi. females, 3 pread. females, 1 ad. male, 1 juv., stn 13, 52°33.831’N 27°29.948’E, 15 m depth; 3 ovi. females, 1 pread. female, 1 ad. male, stn 14, 52°33.591’N 27°29.677’E, 19 m depth; 10 ov. females, 2 pread. f, 1 pread. males, 3 juv stn 24, 52°34.168’N 27°28.797’E, 18 m depth.

Diagnosis. Carapace less than 1/3 of total length, integument calcified, covered by small denticles. Lateral horns behind the level of the eye­lobe, large and forward directed. Uropod peduncle shorter than half length of the endopod, with some simple and plumose setae on inner face. Endopod uniarticulate, as long as exopod.

Description. Ovigerous female, 4.95 mm total length. Carapace ( Fig. 6 A) less than 1/3 of total length, integument calcified, covered by small denticles. Eye­lobe rounded, pseudorostral lobes meeting in front of the eye­lobe for an equal length of the eye­lobe. Lateral horns behind the level of the eye­lobe, large and forward directed.

Antennule ( Fig. 6 B), peduncle triarticulate, article 1 as long as article 3 and slightly longer than article 2; main flagellum biarticulate, very short, with one aesthetascs distally.

Mouthparts: mandible ( Fig. 6 C) with 13 setae between pars incisiva and pars molaris. Maxillule ( Fig. 6 D), inner endite with four acuminate and one serrate setae. Maxilla ( Fig. 6 E), endites exceeding the protopod, with simple and serrate setae. Maxilliped 1 ( Fig. 6 F), basis produced distally and with seven plumose setae on inner margin; carpus with seven flattened setae on inner margin. Maxilliped 2 ( Fig. 7 A), basis longer than the rest of appendage with two long plumose setae distally; carpus longer than merus, with plumose setae on inner margin. Maxilliped 3 ( Fig. 7 B), basis short, as long as the following three segments combined length, distal part produced into a long, narrow, curved process reaching beyond the mero­carpal articulation, with a row of setae on inner margin; ischium shorter than merus, with four plumose setae on inner margin; merus produced distally; carpus longer than propodus; propodus and carpus slender.

Pereopods: pereopod 1 ( Fig. 7 C), basis slightly longer than the three following segments combined length, produced distally beyond the end of ischium into a pointed process; carpus slightly longer than propodus and more than twice as long as dactylus. Pereopod 2 small ( Fig. 7 D), basis shorter than the remaining segments, ischium fused, with the basis. Pereopod 3 and 4 similar ( Fig. 7 E, F), basis longer than rest of appendage with plumose setae on margins and one simple seta on distal corner; merus as long as carpus; carpus and propodus with one long simple seta on distal corner; dactylus shorter than its distal seta. Pereopod 5 ( Fig. 7 G), basis shorter than rest of appendage merus as long as carpus; carpus and propodus with one long simple seta on distal corner; dactylus shorter than its distal seta.

Uropod peduncle with four plumose setae on inner margin ( Fig. 7 H), shorter than half length of rami. Both rami of the same length; endopod with eight plumose and three acuminate setae on inner margin, its tip with a setulate seta; exopod biarticulate with two plumose setae on inner margin of the article 2, its tip with two curved setulate setae.

Adult male 5.2 mm total length. Carapace very different than in female ( Fig. 8 A), with a lot of small circular depressions, a 1/3 of total length and twice as long as deep, with two lateral horns behind the level of the eye­lobe; eye­lobe better developed than in female, with several lenses.

Antennae: antennule ( Fig. 8 B), peduncle triarticulate; article 1 longer than article 3 and about twice long as article 2; main flagellum biarticulate, very short, with one aesthetascs on article 1 and a longer one on article 2. Antenna ( Fig. 8 C), peduncle articles 4 and 5 with rows of sensorial setae on its ventral face.

Pereopods: pereopod 2 ( Fig. 8 D), ischium fused with the basis, basis as long as the following three articles combined lengths; merus carpus and propodus of similar length; dactylus longer than propodus with four setae terminally and two setae on the margins.

Uropod peduncle shorter than half length of the endopod ( Fig. 8 E), with some simple and plumose setae on inner face. Endopod uniarticulate, with several plumose and microsetulate setae on inner margin. Exopod biarticulate, as long as the endopod, with plumose setae on dorsal and ventral margins and a pair of curved serrate setae on the tip.

Remarks. Specimens from the Persian Gulf agree with the description of Kurian (1951). Only small differences were observed in the orientation of the lateral horns that could be due to the relative position of the carapace.

Distribution. South coast of India ( Kurian 1951) and Persian Gulf, between 23 and 28 m depth.

Figures

FIGURE 6. Eocuma travancoricum Kurian 1951, adult female. A, whole animal in lateral view; B, antennule; C, mandible; D, maxillule; E, maxilla; F, maxilliped 1.

FIGURE 7. Eocuma travancoricum Kurian 1951, 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 8. Eocuma travancoricum Kurian 1951, adult male. A, carapace in lateral view; B, antennule; C, peduncle of antenna (first segment lost during dissection); D, pereopod 2; E, uropod.