Enteropsis elongata Kim & Boxshall 2021, sp. nov.
Creators: name: Kim, Il-Hoi
name: Boxshall, Geoff A.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Cyclopoida
Ascidicolidae
Enteropsis
Enteropsis elongata

description: Enteropsis elongata sp. nov.   
(Figs. 179, 180)  
 Type material. Holotype ♀ (MNHN-IU-2014-21582), 14 ♀♀ paratypes (MNHN-IU-2014-21583), and 2 ♀♀ paratypes (dissected, MNHN-IU-2014-17400) from Bçtryllç ẚdes nẚger Herdman, 1886 (MNHN-IT-2008-1688 = MNHN S1 / BOT.A/23); Guadeloupe Stn 13, sand bank west of l’îlet à Cochons, depth 5-10 m, Monniot coll., 23 December 1980.   
 Etymology. The name of the new species reflects its elongate vermiform body.   
 Description of female. Body (Fig. 179 A-C) vermiform, cylindrical, elongate, unsegmented in expanded adult, but distinctly segmented in young adult (Fig. 179C). Mean body length 1.03 mm (0.86-1.16 mm, n=8); dissected young adult (Fig. 179C) 1.0 mm long. Cephalosome (Fig. 179E) slightly longer than wide, with patch of setules on ventrolateral surface lateral to oral region. Fourth pedigerous somite bearing pair of lateral, lobate processes just posterior to leg 4 (Fig. 179 A-C). Genitoabdomen occupying about 18% of body length; genital apertures positioned dorsolaterally. Anal region elevated dorsally (Fig. 179A, B); part of genitoabdomen posterior to anus tapering towards blunt apical margin. Caudal rami and caudal seta absent.   
Rostrum absent (Fig. 179E). Antennule (Fig. 179F) small, unsegmented, tapering, about 1.24 times longer than wide (21×17 μm), with convex ventral margin, and armed with 7 unequal, naked setae. Antenna (Fig. 180A) coni- cal, 37×25 μm, incompletely 2-segmented; both segments unarmed but ornamented with numerous spinules; distal segment triangular, about half as long as proximal segment.  
Labrum (Fig. 179G) with spinulose ventral surface, convex posterior margin, and armed with 2 pairs of slender, spinulose, setiform processes. Mandible absent. Maxillule (Fig. 180B) bilobed; narrower inner lobe tipped with 2 elements (1 plumose seta and 1 spinulose, setiform process); broader outer lobe tipped with 1 spiniform cusp and ornamented with spinules and setules on posterior and outer surfaces. Maxilla (Fig. 180C) massive, 2-segmented; proximal segment unarmed, with inflated, spinulose mediodistal protrusion; distal segment terminating in claw, bearing lateral spine proximally. Maxilliped absent.  
Leg 1 (Fig. 180D) biramous, with 2-segmented protopod; proximal and distal segments of protopod unarmed but ornamented with rows of spinules on anterior surface; rami small, vestigial; exopod claw-like with transparent covering; endopod fleshy, conical. Legs 2-4 same as leg 1. Leg 5 absent.  
 Male. Unknown.   
 Remarks. The most significant feature of bnterçpsẚs elçngata sp. nov. is the lack of caudal rami. This feature is shared with three congeners, b. abbçttẚ Illg & Dudley, 1980, b. fusẚfçrmẚs Ooishi, 2009, and b. mẚnçr Illg & Dudley 1980. bnterçpsẚs elçngata sp. nov. is readily distinguishable from these species because in all three the distal segment of the antenna is transformed to a claw compared with the blunt, conical segment in b. elçngata sp. nov. In addition, b. elçngata sp. nov. has a labrum armed with 4 setiform processes and the outer lobe of the maxillule is tipped with a single cusp, both of which are unique features of the new species, differentiating it from all congeners.
description: Published as part of Kim, Il-Hoi & Boxshall, Geoff A., 2021, Copepods (Cyclopoida) associated with ascidian hosts: Ascidicolidae, Buproridae, Botryllophilidae, and Enteropsidae, with descriptions of 84 new species, pp. 1-286 in Zootaxa 1 on pages 271-273, DOI: 10.11646/zootaxa.4978.1.1, http://zenodo.org/record/4820443