Cumella nastasescui, 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 : 58-60

Cumella nastasescui sp. nov.

( Fig. 26 )

Material examined. Holotype subadult male ( MGAB CUM 1807 ), North of Buoy 4, western Puerto Rico, Caribbean Sea, 18°02'21.8040"N, 67°24'16.0200"W, 70 m, April 30, 2012, collected by Nikolaos V. Schizas during the 2012 UPRM-DMS Mesophotic Cruise.

Diagnosis. Carapace with very short siphon, smooth ventral margin, five lenses on ocular lobe; maxilliped 3 propodus as long as carpus; pereopods with short terminal robust setae; uropodal peduncle 2.26 times last pleonite length.

Description. Subadult male (holotype MGAB CUM 1807).

Body size: 2.58 mm.

Carapace ( Fig. 26 A). Smooth integument, 0.43 times rest of body length, 1.75 times as long as high, pseudorostrum 0.27 times frontal lobe length, very short siphon, six simple setae on dorsal margin, smooth ventral margin, five lenses on ocular lobe.

Pereion, 0.22 of entire body length.

Pleon, 0.48 of entire body length.

Antenna 1 ( Fig. 26 B). Basal article of peduncle 0.88 times rest of articles combined length, middle article 0.75 times apical article length, one simple long seta on each margin, main flagellum as long as apical article length, two long complex pedunculate setae on outer margin, long aesthetascs, accessory flagellum 0.25 times basal article of main flagellum, three terminal setae, two much longer.

Maxilliped 3 ( Fig. 26 C). Basis 1.07 times as long as rest of articles, simple setae and several spines on medial margin, two longer simple setae on medial margin, two long pappose setae on outer process, merus 1.5 times as long as ischium, short simple setae and two longer ones on medial margin; carpus 0.94 times as long as merus, one pappose seta on outer margin, propodus as long as carpus, short setae and two pappose setae on medial margin, one plumose seta on outer margin; dactylus 0.44 times as long as propodus, strong terminal seta 1.33 times dactylus length; strong incompletely developed exopod.

Pereopod 1 ( Fig. 26 D). Basis 0.82 times rest of articles combined length, one simple long seta on serrate medial margin, one simple long seta on medial margin of ischium; merus 1.16 times as long as ischium, one simple seta on each margin of merus, carpus 2 times as long as merus, three simple setae on medial margin, two on outer margin; propodus 0.73 times as long as carpus, three simple setae on each margin; dactylus 0.68 times as long as propodus length, terminal robust seta 0.66 times dactylus length, strong incompletely developed exopod.

Pereopod 2 ( Fig. 26 E). Basis 0.77 times rest of articles combined length, one long simple seta on medial margin, merus 3.75 times as long as ischium, one long simple seta on medial margin; carpus 2.2 times as long as merus, three simple setae on both margins, one simple seta on medial margin of propodus; dactylus 1.5 times propodus, simple short hairs on both margins, one subterminal simple long seta on medial margin, two simple setae on outer margin, four subterminal simple long setae on outer margin, one simple robust seta 1.83 times dactylus length; strong incompletely developed exopod.

Pereopod 3 ( Fig. 26 F). Basis 1.15 times as long as rest of articles together, one simple short seta on medial margin; merus 2 times as long as ischium, one simple seta on medial margin of ischium and merus; carpus 2.25 times as long as merus, two simple setae on each margin; propodus 0.63 times as long as carpus, one simple short seta on each margin; dactylus 0.23 times propodus length, short robust terminal seta as long as dactylus; strong incompletely developed exopod.

Pereopod 4 ( Fig. 26 G). Basis 0.73 times as long as rest of articles together, one simple seta on medial margin, two simple setae on outer margin; merus 1.22 times ischium length, one simple seta on medial margin of ischium and merus; carpus 3.72 times as long as merus, one simple short seta and two longer ones on both margins; propodus 0.44 times as long as carpus, one simple long seta on outer margin; dactylus 0.11 times propodus length, simple seta on outer margin, short robust terminal seta; strong incompletely developed exopod.

Pereopod 5 ( Fig. 26 H). Basis 0.53 times as long as rest of articles together, two simple long setae on outer margin; merus 1.28 times as long as ischium, one simple seta on medial margin; carpus 4.1 times as long as merus length, one simple seta on outer distal margin; propodus 0.54 times as long as carpus, one simple short seta on outer margin; dactylus 0.3 times as long as propodus, one simple short seta on outer distal margin, terminal robust seta 0.71 times dactylus length.

Uropod ( Fig. 26 I). Peduncle 2.26 times as long as last pleonite length, 2.26 times endopod length, four simple setae on medial margin, one on outer margin; exopod 0.78 times endopod length, one simple seta on outer margin of distal article, one subterminal and one robust terminal sensory seta 1.05 times dactylus length; endopod with three compose pedunculate setae and five simple setae on medial margin, one subterminal seta and terminal sensory seta 0.65 times endopod length.

Etymology. The species is dedicated in the memory of Gheorghe Năstăsescu, professor of physiology at the Faculty of Biology from Bucharest, Romania.

Remarks. Cumella nastasescui sp. nov. morphologically resembles C. (Cumewingia) leptopus Calman, 1911 ( Calman, 1911) without siphon, smooth margins of carapace and long uropods than with species from Cumella subgenus. It differs in: 1) pseudorostrum without characteristic lens from Cumewingia subgenus, being a subadult male; 2) pereopod 1, pereopods 3–5 with short terminal robust seta vs. longer; 3) uropodal peduncle with five setae vs. nine in C. (Cumewingia) leptopus .

Figures

FIGURE 26. Cumella nastasescui sp. nov. Holotype 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.