Cumella tuberculata, 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 : 30-34

Cumella tuberculata sp. nov.

( Figs. 12 , 13 )

Material examined. Holotype ovigerous female ( MGAB CUM 1735 ), El Seco, Vieques Island, Puerto Rico, Caribbean Sea, 18°07'24.8520"N, 65°12'05.7600"W, 71 m, January 17, 2010 ; paratypes: 1 subadult male, 1 subadult female, same data as holotype, ( MGAB CUM 1736 ), collected during the 2010 UPRM-DMS Mesophotic cruise.

Diagnosis. Body and appendages covered with tuberculated integument. Dorsal part of the body with club shaped setae. Carapace with four (in female), five (in male) denticles on dorsal margin of anterior half. Ventral margin of carapace serrated on anterior half. Serrate anterior margin of pseudorostrum, ocular lobe with five lenses.

Dactylus of pereopods 3–5 fused with terminal robust setae. Maxilliped 3 propodus 0.9 times carpus length in female; uropodal peduncle 0.86 times last pleonite length in female, 1.27 in male.

Description. Ovigerous female (holotype MGAB CUM 1735).

Body size: 1.87 mm ( Fig. 12 A).

Carapace ( Fig. 12 A), 0.58 times rest of entire body, 1.73 times as long as high; pseudorostrum 0.53 times frontal lobe length, serrate anterior margin with a few terminal setae, ocular lobe with five lenses, four dorsal horns and numerous club-shaped setae, ventral margin serrate in anterior part.

Pereion 0.20 times total length, tuberculate integument with club-shaped setae.

Pleon 0.41 times total length, tuberculate integument with club-shaped setae.

Antenna 1 ( Fig. 12 B). Basal article of peduncle 1.12 times as long as rest of articles together, tuberculate integument of first two articles, one compose pedunculate seta on outer margin of apical article, main flagellum 1.13 times apical article of peduncle, minute accessory one.

Maxilliped 3 ( Fig. 12 C). Basis 0.5 times as long as rest of articles together, two pappose setae on outer process; merus 2.75 times as long as ischium, two simple setae on medial margin, one denticle and one pappose seta on outer margin; carpus as long as merus, two simple short setae and one pappose longer seta on medial margin; propodus 0.9 times as long as carpus, two pappose setae on medial margin; dactylus 0.8 times as long as propodus, terminal robust seta as long as dactylus; slender exopod.

Pereopod 1 ( Fig. 12 D). Basis 0.59 times as long as rest of articles together, one pappose seta on outer margin; merus as long as ischium, one simple seta on medial margin of ischium, one simple seta on outer margin of merus; carpus 1.94 times as long as merus, two simple long setae on both margins; propodus 0.91 times as long as carpus, two simple setae on medial margin, one simple seta on outer margin; dactylus 0.53 times as long as propodus, terminal robust serrate seta as long as dactylus; slender exopod.

Pereopod 2 ( Fig. 12 E). Basis 0.66 times as long as rest of articles together, two simple setae on medial margin, one simple seta on outer margin, granulated integument; merus 3.2 times as long as ischium, one simple seta on both margins; carpus 1.44 times as long as merus, three simple setae on medial distal margin, two simple setae on outer margin; dactylus 1.66 times propodus length, three simple short setae on medial margin, one on outer margin, three subterminal stout setae and one terminal robust seta 1.35 times dactylus length; slender exopod.

Pereopod 3 ( Fig. 12 F). Basis 1.07 times as long as rest of articles combined length, tuberculated integument; merus as long as ischium, one simple seta on medial margin of ischium and merus; carpus 1.87 times as long as merus; propodus 1.4 times as long as carpus; dactylus 0.22 times as long as propodus, fused with terminal robust seta.

Pereopod 4 ( Fig. 12 G). Basis 0.62 times as long as rest of articles together; merus 1.5 times as long as ischium, one simple seta on medial margin of ischium and merus; carpus 1.6 times as long as merus, one seta on outer margin; propodus as long as carpus; dactylus 0.19 times as long as propodus, fused with terminal robust seta.

Pereopod 5 ( Fig. 12 H). Basis 0.43 times as long as rest of articles together; merus 2 times as long as ischium, one simple seta on medial margin; carpus 1.8 times as long as merus, three simple short setae on medial margin, one simple seta on outer margin; propodus 0.66 times as long as carpus; dactylus 0.2 times as long as propodus, fused with terminal robust seta.

Uropod ( Fig. 12 I). Peduncle 0.86 times as long as last pleonite, 1.26 times endopod length, three simple setae on medial margin; exopod 0.73 times as long as endopod, terminal robust seta 1.09 times exopod length; endopod with one simple short seta and one subterminal seta on medial margin, terminal robust seta 0.66 times endopod length.

Description. Subadult male (paratype MGAB CUM 1736).

Body size: 1.96 mm ( Fig. 13 A).

Carapace ( Fig. 13 A), 0.55 times rest of entire body length, 1.86 times as long as high, five horns and five compose pedunculate setae on dorsal margin, short serration on anterior ventral margin.

Pereon 0.21 times total length.

Pleon 0.37 times total length.

Antenna 1 ( Fig. 13 B, C). Basal article of peduncle as long as rest of articles together, one simple seta on medial margin, middle article with one simple seta on medial margin and one compose pedunculate seta on outer margin, main flagellum 1.16 times apical article of peduncle length, minute accessory flagellum with two articles, long aesthetascs.

Antenna 2 ( Fig. 13 A), not fully developed, as for an immature stage.

Maxilliped 3 ( Fig. 13 D). Basis 0.76 times as long as rest of articles together, medial margin short serrate in distal part, two long pappose setae on outer peduncle; merus 2.83 times as long as ischium, one denticle on medial margin, one pappose seta on outer margin; carpus 0.87 times as long as merus, one simple and one plumose longer seta on medial margin; propodus 1.78 times as long as carpus, two pappose setae on medial margin, one plumose seta on outer margin; dactylus 0.32 times propodus length, terminal robust seta 1.25 times dactylus length; incomplete developed exopod.

Pereopod 1 ( Fig. 13 E). Basis 0.47 times as long as rest of articles together, serrate outer margin in distal half, one simple seta on each margin; merus 0.95 times as long as ischium, one simple seta on medial margin of ischium, one simple seta on each margin of merus; carpus 1.83 times as long as merus, two simple setae on both margins; propodus 0.94 times as long as carpus, two simple setae on both margins; dactylus 0.62 times propodus length, terminal robust seta as long as dactylus; incompletely developed exopod.

Pereopod 2 ( Fig. 13 F). Basis 0.72 times as long as rest of articles together; merus 3.2 times as long as ischium, one simple seta on medial margin, carpus 1.33 times as long as merus, one simple seta on medial margin, two on distal margin, and two on outer margin; dactylus 1.43 times as long as propodus, two simple short setae on medial margin, three subterminal stout setae and one terminal robust seta as long as dactylus; incompletely developed exopod.

Pereopod 3 ( Fig. 13 G). Basis 1.09 times rest of articles combined length, four simple setae on medial margin; merus 1.3 times as long as ischium, one simple seta on medial margin of ischium; carpus 1.54 times as long as merus, one simple seta on medial margin, one shorter on outer margin; propodus 0.9 times as long as carpus; dactylus 0.27 times propodus length, fused with terminal robust seta; incompletely developed exopod.

Pereopod 4 ( Fig. 13 H). Basis 0.81 times as long as rest of articles together, one simple seta on medial distal margin; merus 2.43 times as long as ischium, one simple seta on outer margin; carpus 1.35 times as long as merus; propodus 0.95 times as long as carpus; dactylus 0.22 times propodus length, fused with terminal robust seta; incompletely developed exopod.

Pereopod 5 ( Fig. 13 I). Basis 0.47 times as long as rest of articles together, three simple setae on outer margin, one on medial margin; merus 1.66 times as long as ischium, one simple seta on medial margin of ischium and merus; carpus 1.75 times as long as merus, one simple seta on medial margin, two on outer margin; propodus 0.63 times as long as carpus; dactylus 0.22 times propodus length, fused with terminal robust seta.

Uropod ( Fig. 13 J). Peduncle 1.27 times last pleonite length, as long as endopod, two simple setae on outer margin, four sensory setae on medial margin; exopod 0.5 times endopod length, one simple subterminal seta on each article, terminal robust seta as long as exopod; one simple and one subterminal seta on medial margin of endopod, terminal robust seta 0.61 times endopod length.

Etymology. The species was named from Latin, tuberculata , after the tuberculate integument of the body.

Remarks. The new species Cumella tuberculata is closely related to C. amiti sp. nov. also from Puerto Rico, in having four dorsal denticles on the carapace (only the female), serrated anterior margin of pseudorostrum and anterior ventral corner of carapace, pereopods 3-5 with dactylus fused with terminal robust seta, short uropods. It differs with: 1) body and appendages covered with tuberculated integument in C. tuberculata vs. granulose one in C. amiti ; 2) all dorsal denticles placed on anterior half of carapace vs. three denticles on anterior half and one on posterior end; 3) pereopod 1 with shorter carpus vs. longer; 4) pereopod 2 dactylus 1.35 times propodus length vs. 2.53; 4) pereopod 5 carpus 1.8 times merus length vs. 3.4; 5) uropodal peduncle with three medial setae in C. tuberculata vs. four in C. amiti .

Figures

FIGURE 12. Cumella tuberculata sp. nov. Holotype female. A, body, lateral view; B, antenna 1; C, maxilliped 3; D, pereopod 1; E, pereopod 2; F, pereopod 3; G, pereopod 4; H, pereopod 5; I, uropod. Scale bars: A, 0.5 mm; B – H, 0.1 mm; I, 0.2 mm.

FIGURE 13. Cumella tuberculata sp. nov. Paratype subadult male. A, body, lateral view; B, antenna 1; C, antenna 1, accessory flagellum, magnified; D, maxilliped 3; E, pereopod 1; F, pereopod 2; G, pereopod 3; H, pereopod 4; I, pereopod 5; J, uropod. Scale bars: A, 0.5 mm; B, D – J, 0.1 mm; C, 0.05 mm.