Enteropsis elongata, Kim & Boxshall, 2021

Kim, Il-Hoi & Boxshall, Geoff A., 2021, Copepods (Cyclopoida) associated with ascidian hosts: Ascidicolidae, Buproridae, Botryllophilidae, and Enteropsidae, with descriptions of 84 new species, Zootaxa 1, pp. 1-286 : 271-273

publication ID	https://doi.org/ 10.11646/zootaxa.4978.1.1
publication LSID	lsid:zoobank.org:pub:9C7C1723-73EB-4FBE-A47A-54627DEB8F93
DOI	https://doi.org/10.5281/zenodo.10530977
persistent identifier	https://treatment.plazi.org/id/3729879B-FEEB-FEE7-FA93-FC39D4CC19D7
treatment provided by	Plazi
scientific name	Enteropsis elongata
status	sp. nov.

Treatment

Enteropsis elongata sp. nov.

( Figs. 179 View FIG , 180 View FIG )

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 About MNHN / 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 View FIG A-C) vermiform, cylindrical, elongate, unsegmented in expanded adult, but distinctly segmented in young adult ( Fig. 179C View FIG ). Mean body length 1.03 mm (0.86-1.16 mm, n=8); dissected young adult ( Fig. 179C View FIG ) 1.0 mm long. Cephalosome ( Fig. 179E View FIG ) 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 View FIG A-C). Genitoabdomen occupying about 18% of body length; genital apertures positioned dorsolaterally. Anal region elevated dorsally ( Fig. 179A, B View FIG ); part of genitoabdomen posterior to anus tapering towards blunt apical margin. Caudal rami and caudal seta absent.

Rostrum absent ( Fig. 179E View FIG ). Antennule ( Fig. 179F View FIG ) 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 View FIG ) 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 View FIG ) with spinulose ventral surface, convex posterior margin, and armed with 2 pairs of slender, spinulose, setiform processes. Mandible absent. Maxillule ( Fig. 180B View FIG ) 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 View FIG ) 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 View FIG ) 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.