Cumella amiti, 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 : 26-30

Cumella amiti sp. nov.

( Figs. 10 , 11 )

Material examined. Holotype ovigerous female ( MGAB CUM 1734 ), North Star , St. Croix , U.S. Virgin Islands, Caribbean Sea, 17°46'11.4600" N, 64°49'18.2280" W, 52 m, May 1, 2011 ; paratypes: subadult male ( MGAB CUM 1783 ), La Parguera, Puerto Rico, Caribbean Sea, sorted from algae, 58 m ; 1 subadult female ( MGAB CUM 1785 ), North Star , St. Croix , U.S. Virgin Islands, Caribbean Sea, 17°46'11.4600" N, 64°49'18.2280" W, 52 m, May 1, 2011, collected during the 2011 UPRM-DMS Mesophotic Cruise.

Diagnosis. Serrate anterior margin of pseudorostrum, serrate anterior margin of carapace, four denticles, two on frontal lobe, seven capitate (club-shaped) setae on dorsal margin, serrate ventral margin on anterior end; maxilliped 3 propodus 1.88 times carpus length in female; pereopod 1 carpus 2.35 times merus length in female; uropodal peduncle 0.87 times last pleonite length in female, 0.55 in male.

Description. Ovigerous female (holotype MGAB CUM 1734).

Body size: 2.22 mm ( Fig. 10 A).

Carapace ( Fig. 10 A, B), 0.55 times rest of body length, 1.71 times as long as high, pseudorostrum 0.4 times frontal lobe length, serrate anterior margin of pseudorostrum, serrate anterior margin of carapace, four denticles, two on frontal lobe, seven capitate (club-shaped) setae on dorsal margin, serrate ventral margin on anterior end.

Pereon, one dorsal denticle on dorsal end of last four articles, one compose capitate (club-shaped) seta on dorsal margin of 2nd article.

Pleon, two capitate setae on posterior end on each segment.

Antenna 1 ( Fig. 10 C). Basal article of peduncle 0.74 times as long as rest of peduncle length, main flagellum 0.53 times apical article length, accessory flagellum 0.42 times basal article of main one length.

Maxilliped 3 ( Fig. 10 D). Basis 0.66 times as long as rest of articles together, serrate medial margin in distal half, two long plumose setae on outer process; merus 1.28 times ischium length, serrate medial margin, one plumose long seta and a denticle on outer margin; carpus 0.72 times as long as merus, one plumose long seta on outer margin; propodus 1.88 times as long as carpus, two pappose setae on medial margin, one simple seta on outer distal margin; dactylus 0.31 times propodus length, one robust subterminal seta and one terminal robust one as long as dactylus; slender exopod.

Pereopod 1 ( Fig. 10 E). Basis 0.6 times as long as rest of articles together, serrate medial margin; merus 1.54 times ischium length, one simple seta on medial margin of both articles; carpus 2.35 times as long as merus, two simple setae on medial margin; propodus 0.66 times as long as carpus, two simple setae on medial margin, three on outer one; dactylus 0.4 times as long as propodus, terminal robust seta 1.3 times dactylus length; slender exopod.

Pereopod 2 ( Fig. 10 F). Basis 0.56 times as long as rest of articles together; merus 4 times as long as ischium; carpus 1.5 times as long as merus, two stout short setae on medial distal margin; dactylus 2.53 times as long as propodus, three short simple setae on medial margin, one simple stout subterminal seta on each margin and one terminal robust seta 1.21 times dactylus length; slender exopod.

Pereopod 3 ( Fig. 10 G). Basis 0.88 times as long as rest of articles together, one simple seta on medial margin, distal half; merus 1.7 times as long as ischium, one simple short seta on medial margin of both articles; carpus 1.7 times as long as merus, one simple short seta on outer margin; propodus 0.79 times as long as carpus; dactylus 0.22 times propodus length, fused with terminal robust seta.

Pereopod 4 ( Fig. 10 H). Basis 0.59 times rest of articles combined length; merus 1.54 times as long as ischium, one simple short seta on medial margin of both articles; carpus 1.9 times as long as merus, two short setae on outer distal corner; propodus 1.26 times carpus length, one simple short seta on outer distal corner; dactylus 0.16 times as long as propodus, fused with terminal robust seta.

Pereopod 5 ( Fig. 10 I). Basis 0.44 times rest of articles combined length, merus 1.5 times ischium length, one simple seta on medial margin of merus, carpus 3.4 merus length, one simple seta on both margins of carpus, dactylus 0.6 times propodus length, fused with terminal robust seta.

Uropod ( Fig. 10 J). Peduncle 0.87 times as long as last pleonite, 1.48 times endopod length, serrate medial margin with four simple setae; exopod 0.82 times endopod length, one simple short seta on outer margin of proximal article, one subterminal seta on both margins of distal one, one terminal robust seta 0.89 times exopod length; endopod with serrate medial margin, one simple short seta on medial margin, one subterminal and one terminal robust seta 0.78 times endopod length.

Description. Subadult male (paratype MGAB CUM 1783).

Body size: 2.34 mm ( Fig. 11 A).

Carapace ( Fig. 11 A), 0.52 times rest of body length, 1.63 times as long as high, pseudorostrum 0.42 times frontal lobe length, serrate anterior margin of pseudorostrum and of carapace, serrate ventral margin, two dorsal denticles, several capitate (club-shaped) setae on granulated integument.

Antenna 1 ( Fig. 11 B). Basal article of peduncle as long as rest of peduncle, accessory flagellum 0.2 times main flagellum length.

Maxilliped 3 ( Fig. 11 C). Basis 0.56 times as long as rest of articles together, two long pappose setae on outer process; merus 2 times as long as ischium, two plumose setae on medial margin, one pappose seta on outer margin; carpus 0.75 times as long as merus, one pappose seta on outer distal margin, two plumose setae on medial margin; propodus 1.66 times as long as carpus, two pappose setae on medial margin, one plumose seta on outer margin; dactylus 0.35 times as long as propodus, one terminal curved robust seta as long as dactylus; incompletely developed exopod.

Pereopod 1 ( Fig. 11 D). Basis 0.59 times rest of articles combined length, serrate medial margin in distal half; merus 1.71 times as long as ischium, one simple seta on medial margins of ischium and merus; carpus 2.25 times as long as merus, three simple setae on medial margin; propodus 0.74 times as long as carpus, two simple setae on both margins; dactylus 0.5 times as long as propodus, one terminal robust curved seta as long as dactylus; incompletely developed exopod.

Pereopod 2 ( Fig. 11 E). Basis 0.39 times rest of articles together; merus 3.5 times as long as ischium, long simple seta on medial margin; carpus 1.5 times as long as merus, one long stout seta on medial distal corner; dactylus 2 times as long as propodus, terminal robust seta 1.1 times dactylus length; incompletely developed exopod.

Pereopod 3 ( Fig. 11 F). Basis 0.62 times as long as rest of articles together, merus 1.62 times as long as ischium, one simple seta on medial margins of ischium and merus; carpus 1.61 times as long as merus, one simple short seta on outer margin; propodus 0.95 times as long as carpus, one short simple seta on outer margin; dactylus 0.35 times propodus length, fused with terminal robust seta; incompletely developed exopod.

Pereopod 4 ( Fig. 11 G). Basis 0.45 times as long as rest of articles together; merus 1.27 times as long as ischium, one simple seta on medial margin of ischium and merus; carpus 3 times as long as merus; propodus 0.64 times as long as carpus; dactylus 0.28 times as long as propodus, fused with terminal robust seta; incompletely developed exopod.

Pereopod 5 ( Fig. 11 H). Basis 0.34 times rest of articles combined length; merus 1.22 times ischium length, one simple seta on medial margins of ischium and merus; carpus 2.54 times as long as merus; propodus 0.78 times carpus length; dactylus 0.3 times propodus length, fused with terminal robust seta.

Uropod ( Fig. 11 I). Peduncle 0.55 times as long as last pleonite, 1.21 times endopod length, two simple short setae on outer margin; exopod 0.71 times as long as endopod, one short subterminal seta on each margin of distal article, terminal robust seta 1.5 times exopod length; endopod with one simple short seta and one subterminal seta on medial margin, terminal robust serrulate seta 1.07 times endopod length.

Etymology. Named after Mr. Amit Dey, EDP incharge, Indian School of Learning, Dhanbad, Jharkhand, India as a token of love for his constant help to arrange the figure plates.

Remarks. Cumella amiti sp. nov. is similar to C. alexandrinae Petrescu, Chatterjee & Schizas (2012) and C. tuberculata sp. nov. (both of them from Puerto Rico) with four dorsal denticles on carapace. It differs with: 1) ocular lobe with five lenses like in C. tuberculata sp. nov. vs. two in C. alexandrinae ; 2) female with one denticle in posterior part of carapace like in C. alexandrinae vs. not like in C. tuberculata ; 3) serrate vs. smooth anterior margin of carapace; 4) pereopod 1 propodus shorter than carpus like in C. tuberculata vs. as long as in C. alexandrinae ; 5) uropodal peduncle shorter than last pleonite like in C. tuberculata vs. longer in C. alexandrinae ; 6) female uropod, peduncle with four setae on medial margin vs. five in C. alexandrinae and three in C. tuberculata .

Figures

FIGURE 10. Cumella amiti sp. nov. Holotype female. A, body, lateral view; B, carapace anterior ventral corner, detail; 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, 0.5 mm; B – J, 0.1 mm.

FIGURE 11. Cumella amiti sp. nov. Paratype subadult male. 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 – I, 0.1 mm.