Cumellana caribbica Petrescu, Chatterjee & Schizas, 2012, sp. nov.
Creators: name: Petrescu, Iorgu
name: Chatterjee, Tapas
name: Schizas, Nikolaos V.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Cumacea
Nannastacidae
Cumellana
Cumellana caribbica

description: Cumellana caribbica sp. nov.
(Figs 2 A–I, 3 A–H)
Material Examined. Holotype immature female, (MGAB CUM 1672), Caribbean Sea, SW Puerto Rico, offshore La Parguera, El Hoyo (17°52'35.6160" N, 67°02'26.1960" W), 80–90 m, June 4, 2010. Collected by the UPRM- DMS Trimix Rebreather diving team and extracted from sediment by Nikolaos Schizas.
Diagnosis. Small size species, smooth carapace without antennal notch; ocular lobe with 3 lenses. Long antenna 1 without tubercle on second article of peduncle. Labium with a terminal forked seta. Maxilla 1 palp with 2 glabrous filaments. Maxilla 2 with terminal articles never exceeding basis. Mandible pars incisiva with 3 teeth, lacinia mobilis with 3 short teeth, massive pars molaris. Maxilliped 1 basis without medial setae, with large dactylus. Maxilliped 3 with propodus longest article. Pereopod 1 dactylus with short terminal setae. Pereopod 2 dactylus with 3 short terminal setae, middle one robust. Pereopods 3–5 with robust articles. Uropod with peduncle shorter than last pleonite.
Description. Female, 2.0 mm. Body covered with smooth integument.
Carapace (Fig. 2 A), 0.3 times entire body length, longer than high, pseudorostral lobes 0.4 times length of frontal lobe, ocular lobe with three large lenses, margins of carapace without any denticulation.
Pereon, all five segments visible, 0.85 times carapace length.
Pleon, 1.6 times as long as pereon length.
Antenna 1 (Fig. 2 B) long, basal article of peduncle 0.6 times as long as the rest of articles combined; main flagellum with short aesthetascs; accessory flagellum minute.
Antenna 2 (Fig. 2 C), one article with two pappose setae.
Labium (Fig. 2 D), ending article with a forked, robust seta.
Mandible (Fig. 2 E), pars incisiva with three teeth, lacinia mobilis with three teeth, five plumose setae between pars incisiva and pars molaris, robust pars molaris.
Maxilla 1 (Fig. 2 F), inner endite with six apical simple and serrate setae, outer endite with three setae, one simple, one forked one and one plumose; palp with two terminal filaments.
Maxilla 2 (Fig. 2 G), outer and inner endite little exceed broad endite terminal margin, eight simple setae on medial margin of broad endite.
Maxilliped 1 (Fig. 2 H), basis with three short robust setae on its endite, two retinacula on smooth medial margin; carpus with five spatulate setae interspersed with simple ones on medial margin and a pappose seta on medial distal corner; propodus 1.5 times as long as dactylus; large dactylus with a terminal simple robust seta.
Maxilliped 2 (Fig. 2 I), basis 0.33 times entire appendage length, long pappose seta on distal medial corner; merus 2.6 times as long as ischium; carpus 1.5 times as long as merus, a pappose seta on medial margin; bulky propodus 0.74 times as long as carpus, two pappose setae and a simple one on medial margin, one pappose seta on outer distal corner; dactylus 0.35 times as long as propodus, with setose margins, strong robust terminal seta.
Maxilliped 3 (Fig. 3 A), basis 0.25 times entire appendage length, two plumose setae on outer distal corner; short ischium; merus as long as carpus, with an outer plumose seta; merus with a small spine on outer corner and a plumose seta; carpus with a plumose seta; long propodus, 1.1 times as long as basis length, 2.3 times as long as dactylus, short plumose seta on distal outer corner; dactylus with a terminal curved robust seta and a serrate one; developed exopod.
Pereopod 1 (Fig. 3 B), basis 0.3 times entire length of appendage; carpus as long as ischium and merus combined; propodus 0.58 times as long as carpus; dactylus shorter than propodus, with 3 short robust terminal setae, middle one stronger; exopod 0.9 times as long as exopod of maxilliped 3.
Pereopod 2 (Fig. 3 C, D), basis 0.35 times as long as entire length of appendage; bulky merus 5 times as long as ischium, with a simple seta on inner margin; carpus 1.2 times as long as merus, 1.7 times as long as propodus, as long as dactylus; dactylus with a robust terminal seta and three simple ones, shorter than dactylus; small exopod.
Pereopod 3 (Fig. 3 E), basis 0.3 times entire length of appendage; carpus little longer than merus; propodus longer than carpus, 3.6 times as long as dactylus; dactylus with a long and strong robust terminal seta.
Pereopod 4 (Fig. 3 F), basis shorter than in pereopod 3; propodus little longer than carpus, twice as long as dactylus; dactylus with a short robust terminal seta.
Pereopod 5 (Fig. 3 G), basis shorter than pereopods 3 and 4, 0.25 times entire appendage length; carpus 1.4 times as long as ischium and merus combined; propodus little shorter than carpus, 1.9 times as long as dactylus; dactylus with a short slender terminal seta.
Uropod (Fig. 3 H), peduncle 0.6 times as long as last pleonite, 0.9 times as long as endopod; endopod with three simple short setae on inner margin and a strong robust terminal seta; exopod 0.83 times as long as endopod, proximal article a third of distal one, with a long terminal simple seta.
Male. Unknown.
Etymology. Named after the Caribbean Sea.
Remarks. The new genus and species resembles three other genera within the family Nannastacidae: Almyracuma Jones & Burbanck (1959), Claudicuma Roccatagliata, 1981, both from American waters (Jones & Burbanck, 1959; Roccatagliata, 1981) and Picrocuma Hale, 1945 from Australia (Hale, 1945). The shared morphological characters of these genera are the carapace without any antennal notch and the pediform aspect of maxilliped 3. Cumellana caribbica gen. et sp. nov. can be distinguished from the three genera by a combination of characters: labium with a terminal forked seta, propodus of maxilliped 3 longest article of appendage, dactylus of pereopod 2 with short terminal setae, uropod peduncle shorter than uropod rami. There are some similarities between the new genus Cumellana and four species of the genus Cumella (C. clavicauda Calman (1911), C. coralicola Bäcescu (1971), C. murariui Petrescu (2002) and C. radui Petrescu & Iliffe (1992)): carapace without evident antennal notch, uropodal peduncle shorter than last pleonite. However, the genus Cumellana can be differentiated from Cumella by the longer antennules, maxilliped 3 with shorter basis and longer propodus, and shorter terminal setae of pereopod 2.
description: Published as part of Petrescu, Iorgu, Chatterjee, Tapas & Schizas, Nikolaos V., 2012, New genus and new species of Cumacea (Crustacea: Peracarida) from the mesophotic coral ecosystem of SW Puerto Rico, Caribbean Sea, pp. 55-61 in Zootaxa 3476 on pages 58-60, DOI: 10.5281/zenodo.211298