Cumella sancristobalensis, Petrescu, Iorgu, Chatterjee, Tapas & Schizas, Nikolaos V., 2016

Petrescu, Iorgu, Chatterjee, Tapas & Schizas, Nikolaos V., 2016, New species and new records of Cumacea (Crustacea: Peracarida: Cumacea) from mesophotic reefs of Puerto Rico and U. S. Virgin Islands, Caribbean Sea, Zootaxa 4199 (1), pp. 1-78 : 72-74

Cumella sancristobalensis sp. nov.

( Fig. 31 )

Material examined. Holotype adult male ( MGAB CUM 1773 ), San Cristobal reef, La Parguera, Puerto Rico, Caribbean Sea, 17°56'28.68"N, 67°04'34.75"W, September 6, 2012, 3 m ; paratypes: 25 adult males ( MGAB CUM 1669 ), San Cristobal reef, La Parguera, Puerto Rico, Caribbean Sea, 17°56'28.68"N, 67°04'34.75"W, collected by Nikolaos V. Schizas.

Diagnosis. Carapace without dorsal spines pseudorostrum, 0.22 times frontal lobe length, ocular lobe with seven marginal lenses and one in the middle, short siphon; maxilliped 3 propodus 1.53 times carpus length; uropodal peduncle 0.85 times last pleonite length, 1.94 times endopod length, 3 setae on medial margin; endopod with 5 setae on medial margin.

Description. Adult male (holotype MGAB CUM 1773).

Body size: 2.17 mm ( Fig. 31 A).

Carapace ( Fig. 31 A, B). Smooth integument, 0.36 of entire body length, 2.12 times longer than high, 1.4 times as long as large, pseudorostrum 0.22 times frontal lobe length, ocular lobe with seven marginal lenses and one in the middle, short siphon and anterior margin, carapace without dorsal spines (denticle), smooth ventral margin.

Pereion, 0.26 times entire body length.

Pleon, 0.33 times entire body length.

Antenna 1 ( Fig. 31 C). Basal article of peduncle 1.11 times rest of articles combined length, apical article 1.07 times middle one, main flagellum 0.71 times apical article of peduncle length, accessory flagellum 0.33 times basal article of main flagellum length, three aesthetascs on apical article of peduncle, two on main flagellum.

Antenna 2 reaches the extremity of pleonite 3.

Maxilliped 3 ( Fig. 31 D). Basis 1.1 times as long as rest of article together, short serration on medial margin, three simple setae on medial margin, two pappose ones on outer process; merus 2.58 times as long as ischium, serrate medial margin with two simple setae, one pappose one on outer margin; carpus 0.83 times as long as merus, two simple setae and two plumose ones on medial margin; propodus 1.53 times as long as carpus, one simple and two pappose setae on medial margin, one simple seta on outer margin; dactylus 0.39 times as long as propodus, terminal robust seta as long as dactylus; fully developed exopod.

Pereopod 1 ( Fig. 31 E). Basis 0.69 times as long as rest of articles together, one simple seta on medial margin, one plumose seta on outer one, a hyaline crest on outer margin; merus as long as ischium, serrate medial margin with a simple seta on both articles; carpus 2.41 times merus length, serrate medial margin with two simple short setae; propodus 0.69 times as long as carpus, two simple short setae on medial margin, three on outer one; dactylus 0.5 times as long as propodus, terminal robust seta 1.2 times dactylus length; fully developed exopod.

Pereopod 2 ( Fig. 31 F). Basis 1.24 times as long as rest of articles together, serrate outer margin on distal half, two simple short setae on medial margin; merus 5 times as long as ischium, one simple seta on medial margin, carpus 1.3 times as long as merus; two plumose setae on outer margin, two simple ones on medial margin, both serrate margins; dactylus 2.14 times as long as propodus, two simple short setae on outer margin, two subterminal short setae and terminal robust seta 1.2 times dactylus length; fully developed exopod.

Pereopod 3 ( Fig. 31 G). Basis 0.81 times as long as rest of articles together, one simple seta on outer margin; merus 1.8 times as long as ischium, two simple setae on outer margin of ischium, one on outer margin of merus; carpus 1.6 times as long as merus, serrate outer margin with one simple short seta, two simple short ones on medial margin; propodus 0.68 times as long as carpus; dactylus 0.4 times as long as propodus, fused with terminal seta, terminal robust seta 1.75 times dactylus length; fully developed exopod.

Pereopod 4 ( Fig. 31 H). Basis 0.82 times as long as rest of articles together, one simple seta on outer margin; merus 1.37 times as long as ischium, one simple seta on outer margin; carpus 1.45 times as long as merus, serrate margins; propodus 0.87 times as long as carpus, one simple short seta on medial margin; dactylus 0.28 times as long as propodus; fused with terminal seta, terminal robust seta 2 times dactylus length, fully developed exopod.

Pereopod 5 ( Fig. 31 I). Basis 0.64 times as long as rest of articles together, serrate medial margin, one simple short seta on outer margin; merus 1.83 times as long as ischium length; carpus 1.7 times as long as merus, one simple short seta on both margins; propodus 1.54 times as long as carpus, one simple short seta on outer margin; short dactylus fused with terminal robust long seta, terminal robust seta 0.3 times dactylus length.

Uropod ( Fig. 31 J). Peduncle 0.85 times as long as last pleonite, 1.94 times endopod length, serrate margins, three sensory setae on medial margin; exopod 0.77 times endopod length, one simple short seta on outer margin of each article, terminal robust seta 2.14 times exopod length; endopod with two simple short setae and three sensory longer setae on medial margin, terminal robust seta 1.38 times endopod length.

Etymology. The species bears the name of type locality, San Cristobal reef, La Parguera, Puerto Rico.

Remarks. Cumella sancristobalensis sp. nov. resembles C. antipai Petrescu, Iliffe & Sarbu, 1994 from Jamaica ( Petrescu et al., 1994) with three setae on uropodal peduncle and C. baraschi sp. nov. from Puerto Rico with long carapace, with smooth integument, without tumidities like in C. antipai . It also differs with: 1) maxilliped 3 with longer basis than in C. baraschi ; 2) uropodal peduncle with three vs. four setae on medial margin in C. antipai and C. baraschi ; 3) uropodal endopod with three longer setae and two shorter vs. four setae in C. baraschi . Cumella sancristobalensis sp. nov. was collected from a shallow coastal reef and has not been found in mesophotic reefs at present.

Figures

FIGURE 31. Cumella sancristobalensis sp. nov. Holotype male. A, body, lateral view; B, carapace, dorsal view; C, antenna 1; D, maxilliped 3; E, pereopod 1; F, pereopod 2; G, pereopod 3; H, pereopod 4; I, pereopod 5; J, uropod. Scale bars: A, B, 0.5 mm; C – J, 0.1 mm.