Cumella alexandrinae 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
Cumella
Cumella alexandrinae

description: Cumella alexandrinae sp. nov.
(Fig. 1 A–J)
Material Examined. Holotype immature female (MGAB CUM 1671), Caribbean Sea, SW Puerto Rico, offshore La Parguera, Hole-in-the-Wall (17°53'04.5960" N, 67°01'18.9120" W), 73 m depth, October 21, 2008, collected by the University of Puerto Rico-Mayagüez, Department of Marine Sciences (UPRM-DMS) Trimix Rebreather diving team and extracted from sediment by Nikolaos Schizas.
Diagnosis. Carapace with four dorsal spines. Fifth segment of pleon 1.5 times as long as the preceding three segments combined. Maxilliped 3 with propodus 1.4 times as long as carpus. Pereopod 1, basis 0.32 of entire length, carpus as long as propodus. Pereopod 2, basis 0.41 of entire length, dactylus 1.7 times as long as propodus. Pereopods 3 and 4 with dactylus fused with terminal seta. Uropodal peduncle 1.13 times as long as last pleonite, 1.5 times as long as rami, endopod 1.6 times as long as exopod.
Description. Female. Body, size: 2.8 mm (Fig. 1 A, B), covered with smooth integument.
Carapace (Fig. 1 A, B), 0.32 times entire body length, 1.6 times longer than high, pseudorostral lobe 0.66 times as long as ocular lobe; ocular lobe with two large lateral lenses; four dorsal spines, three on frontal lobe, last one in the posterior extremity; antennal notch not visible, ventrolateral margin with a short serration and a less prominent corner.
Pereon, 0.23 times entire body length, all five segments visible.
Pleon, 0.45 times entire body length, fifth segment 1.5 times as long as fourth one.
Antenna 1 (Fig. 1 C), with short aesthetascs, peduncle with progressively shorter articles, main flagellum with two articles, as long as distal article of peduncle accessory flagellum tiny.
Maxilliped 3 (Fig. 1 D), basis 0.33 times entire appendage length, short outer process with two long plumose setae, other three much shorter setae, on inner margin; ischium 0.5 times length of merus; merus with a spine on outer margin and a long plumose seta, simple seta on inner margin; carpus 1.3 times as long as merus, two simple setae on inner distal corner, long plumose seta on distal margin; propodus, 2nd longest article, 1.4 times as long as carpus, 1.8 times as long as dactylus, two setae on inner margin; dactylus with two serrate and one simple terminal setae. Slender exopod.
Pereopod 1 (Fig. 1 E), basis 0.32 times entire pereopod length; merus little longer than ischium; carpus as long as propodus; propodus 1.9 times as long as dactylus; dactylus with a terminal robust seta as long as article. Slender exopod.
Pereopod 2 (Fig. 1 F), basis 0.41 times entire pereopod length; merus 3 times as long as ischium; carpus 1.5 times as long as merus; propodus 0.55 times as long as carpus; dactylus 1.7 times as long as propodus, two terminal simple setae. Slender exopod.
Pereopod 3 (Fig. 1 G), basis 1.4 times as long as rest of articles combined; propodus 3 times as long as dactylus; dactylus fused with a short curved robust terminal seta.
Pereopood 4 (Fig. 1 H), basis 0.42 times entire pereopod length, longer than ischium to carpus combined; carpus little longer than ischium and merus combined; propodus 4 times as long as dactylus; dactylus fused with terminal seta.
Pereopod 5 (Fig. 1 I), broken, only basis and ischium present, in both pairs, basis 5 times as long as ischium.
Uropod (Fig. 1 J), peduncle 1.13 times as long as last pleonite, 1.5 times as long as exopod, five simple short setae on inner margin; endopod 1.6 times as long as exopod, two simple setae on inner margin, both rami ending with a short robust seta.
Male. Unknown.
Etymology. The species is dedicated to the memory of Alexandrina Negrea, distinguished biologist, specialist in gastropods, from the Romanian Speleological Institute "Emil Racovitza" from Bucharest, as a sign of posthumous gratitude for all the warm love she showed to the first author.
Remarks. Cumella alexandrinae sp. nov. closely resembles C. jamaicensis Petrescu, Iliffe & Sarbu, 1994, C. medeeae Petrescu, Iliffe & Sarbu, 1994, C. zimmeri Petrescu, Iliffe & Sarbu, 1994 from Jamaica (Petrescu et al, 1994), C. spinifera Petrescu & Heard, 2004 from the Caribbean coast of Costa Rica (Petrescu & Heard, 2004), C. serrata Calman, 1911 from Belize and U. S. Virgin Islands (Petrescu, 2002), C. biserrata Petrescu, 2000 and C. ruetzleri Petrescu, 2002 from Belize (Petrescu, 2002), C. meridionalis Jones, 1984 from Atlantic deep waters (Jones 1984) and C. californica Watling & McCann, 1997 from California (Watling & McCann, 1997). It differs from C. jamaicensis (eight mid-dorsal spines on carapace), C. zimmeri (three mid-dorsal spines on carapace), C. medeeae (five spines), C. biserrata with two parallel rows of small dorsal spines, C. ruetzleri (three spines and up to 16 tubercles with rounded tips in two dorsal rows on carapace), C. spinifera (12 dorsal spines on carapace), C. californica (4–5 dorsal spines), C. meridionalis (five dorsal spines in female), in having four dorsal spines, pleon longer than the rest of the body, as in C. biserrata, C. serrata, C. meridionalis, C. spinifera and C. zimmeri (species with more dorsal spines on carapace).
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 56-58, DOI: 10.5281/zenodo.211298