Cumella achimae Petrescu, Chatterjee & Schizas, 2014, sp. nov.
Creators: name: Petrescu, Iorgu
name: Chatterjee, Tapas
name: Schizas, Nikolaos V.
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Cumacea
Nannastacidae
Cumella
Cumella achimae

description: Cumella achimae sp. nov.
(Figs 1, 2)
Material examined. Holotype: immature female (MGAB CUM 1687), Caribbean Sea, SE Mona Island (18°02'46.0800" N, 67°52'42.7200" W), Puerto Rico, wash from coral Agaricia lamarcki, 240 ft (73.1 meters) depth, 13.01.2010. Collected by the DMS-UPRM-CCRI Trimix Rebreather diving team.
Diagnosis. Carapace with 8 dorsal denticles, 4 of them smaller, placed on frontal lobe, uropodal peduncle 1.5 times of 6th pleonite, as long as rami, endopod with 2 medial setae, both rami with long terminal setae.
Description. Female (Immature) Body size: 2.58 mm.
Carapace (Fig. 1 A). It’s 0.36 times of entire body length, 1.75 times longer than high, 8 denticles on dorsal side, first 4 of them smaller, ocular lobe with 3 lenses, 3 teeth on antero-ventral margin.
Antenna 1 (Fig. 1 B). Basal article of peduncle 0.88 times as long as rest of articles together, short accessory flagellum, missing main one.
Mandible (Fig. 1 C). Pars incisiva with 3 teeth, lacinia mobilis with 2 teeth, 5 setose setae between pars incisiva and pars molaris, robust pars molaris.
Maxilla 1 (Fig. 1 D). It has 5 apical setae on inner endite, 3 simple setae and 1 hand-like seta on outer endite, 2 short terminal filaments.
Maxilliped 1 (Fig. 2 A). It has 5 plumose setae on medial margin of basis, 2 retinacula and 4 long robust setae on top of its endite, 5 robust setae on medial margin of carpus, propodus with 2 simple medial setae and 1 pappose outer seta, slender dactylus, with 2 terminal short setae.
Maxilliped 2 (Fig. 2 B). Basis little longer than rest of articles length, 1 pappose seta on medial margin of basis and merus, ischium fused with merus, 1 outer pappose seta on carpus, 1 simple short outer seta on propodus, dactylus with 3 terminal short teeth.
Maxilliped 3. Missing.
Pereopod 1 (Fig. 2 C). Basis 0.33 times total length, 1 simple seta on medial margin, merus 1.33 times ischium length, carpus 1.5 times merus length, propodus as long as carpus, dactylus 0.66 times propodus length, 1 terminal robust seta as long as dactylus; incompletely developed exopod.
Pereopod 2 (Fig. 2 D). Basis little shorter than rest of articles combined length, outer margin little serrate on apical end, merus 5 times as long as ischium, 1 simple seta on medial margin, carpus 1.2 times as long as merus, dactylus 3 times as long as propodus, 3 short simple setae on medial margin of dactylus, other 3 subapical ones and 1 long terminal seta, 1.6 times of dactylus length, with exopod.
Pereopod 3 (Fig. 2 E). Basis 0.77 times as long as next 4 following articles together, merus 1.6 times as long as ischium, carpus twice as long as merus, propodus half as long as carpus, dactylus fused with terminal robust seta.
Pereopod 4 (Fig. 2 F). Basis 0.55 times as long as next 4 following articles together, merus 2.1 times as long as ischium, carpus 1.86 times as long as merus, propodus half of the carpus length, dactylus fused with terminal robust seta.
Pereopod 5 (Fig. 2 G). Basis 0.34 times as long as next 4 following articles combined, merus 1.25 times as long as ischium, carpus 1.4 times as long as merus, propodus as long as carpus, dactylus 0.25 times of propodus length, fused with terminal robust seta.
Uropod (Fig. 2 H). Peduncle 1.5 times of last pleonite length, as long as endopod, exopod 0.82 times as long as endopod, terminal robust seta as long as exopod length, endopod with 1 simple seta and 2 robust ones on medial margin, terminal robust seta 0.62 times of endopod length.
Etymology. The species is dedicated in honor of Mihaela Achim, Petrescu’s colleague from “Grigore Antipa Museum, as a sign of utmost gratitude for all her kind help.
Remarks. The new species, Cumella achimae sp. nov. belongs to the group of Cumella species with dorsal denticles on carapace reported in the Caribbean, Bermuda (Petrescu & Sterrer, 2001), Jamaica (Petrescu, Iliffe & Sarbu, 1994), Costa Rica (Petrescu & Heard, 2004), Belize (Petrescu, 2002) and Puerto Rico (Petrescu, Chatterjee & Schizas, 2012, 2013, 2014 in press). Cumella achimae sp. nov. is closely related to C. jamaicensis Petrescu, Iliffe & Sarbu, 1994, in having 8 dorsal denticles on the carapace and a short uropodal peduncle, but it differs in the following characters: antero-ventral margin of carapace smooth in C. achimae versus with teeth in C. jamaicensis, pereopod 1 with fewer setae, pereopod 2 dactylus with setae only on medial margin in C. achimae versus setae on both margins in C. jamaicensis, uropodal peduncle longer (6th pleonite/peduncle: 1.5 in C. achimae versus 0.58 in C. jamaicensis), higher ratio uropodal exopod/ endopod (0.82 in C. achimae versus 0.72 in C. jamaicensis), endopod with 3 setae in C. achimae versus none in C. jamaicensis.
description: Published as part of Petrescu, Iorgu, Chatterjee, Tapas & Schizas, Nikolaos V., 2014, Three new Nannastacidae (Crustacea: Cumacea) species from a Caribbean mesophotic ecosystem, pp. 360-370 in Zootaxa 3765 (4) on pages 361-364, DOI: 10.11646/zootaxa.3765.4.4, http://zenodo.org/record/227871