Enteropsis hispida, 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 : 269

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.5047165
persistent identifier	https://treatment.plazi.org/id/3729879B-FEE9-FEFB-FA93-FEE8D1611AAE
treatment provided by	Plazi
scientific name	Enteropsis hispida
status	sp. nov.

Treatment

Enteropsis hispida sp. nov.

( Figs. 177 View FIG , 178 View FIG )

Type material. Holotype ♀ (MNHN-IU-2014-21581, dissected and mounted on a slide) from Apl ẚdẚum mernççensẚs (Brewin, 1956) (MNHN-IT-2008-552 = MNHN A1 About MNHN / APL.B/215); New Caledonia, Stn NC 16, platier de l’ïlot Maitre, near l’ïlot Carnard (under stones and in interstices between corals), depth 3-8 m, Monniot coll., 12 September 1985.

Etymology. The name of the new species is derived from the Latin hẚspẚd (=hairy), referring to its hairy body.

Description of female. Body ( Fig. 177A, B View FIG ) eruciform, unsegmented; body length 832 μm, excluding caudal rami; maximum width 216 μm (across second pedigerous somite). Body surface sparsely ornamented with scattered setules (or sensilla) ( Fig. 177A, B, C View FIG ). Cephalosome, first to fourth pedigerous somites, and genitoabdomen defined by weak lateral and ventral constrictions. Cephalosome slightly narrower than first pedigerous somite, semicircular, 164 μm wide, with sclerotized sculpturing dorsally. First to fourth pedigerous somites each with sclerotized sculpturing dorsolaterally, as shown in Fig. 177A and B View FIG . Genitoabdomen tapering, short, 116 μm long, without any trace of articulations; genital apertures positioned laterally in middle of genitoabdomen; anal prominence small, but distinct and bilobed. Caudal ramus ( Fig. 177C View FIG ) represented by large, stiff caudal seta, 87 μm long.

Rostrum absent. Antennule ( Fig. 177D View FIG ) small, unsegmented, 2.1 times longer than wide (36×17 μm), slightly narrowing distally; armed with 8 naked setae (1 very small). Antenna ( Fig. 177E View FIG ) very small, 32 μm long, digiti- form, 2-segmented; proximal segment unarmed, 16×12 μm; distal segment 16×9 μm, armed with 1 spinulose apical spine (12 μm long) and ornamented with 2 transverse rows of spinules distally.

Labrum ( Fig. 177F View FIG ) longer than wide, with finely spinulose, convex posterior margin and 1 large, transparent, linguiform protrusion subdistally on ventral surface. Mandible absent. Maxillule ( Fig. 177F View FIG ) 2-segmented; proximal segment unarmed; distal segment bilobed; larger inner lobe tipped with 2 spinulose setae, larger seta 42 μm long, 2.6 times longer than smaller seta, bearing 2 prominent setules near proximal third; smaller outer lobe tipped with 2 equal, small spinulose setae (about 10 μm). Maxilla ( Fig. 177G View FIG ) 2-segmented, subchelate, robust; proximal segment with 1 tubercle-like process on medial margin, opposing tip of terminal claw of distal segment; with pore of maxillary gland subdistally on posterior surface; distal segment bearing strong, curved terminal claw and 1 proximal seta laterally. Maxilliped absent.

Legs 1-4 ( Fig. 178 View FIG A-C) 2-segmented; proximal segment (coxa) unarmed, ornamented with large setules on ventral surface; numbers of setules 4 in leg 1, 5 in leg 2, and 3 in legs 3 and 4. Distal segment subcircular or subquadrate, tipped with 1 small claw (representing exopod) embedded in transparent covering and with 1 setule near base of claw; endopod absent. Leg 5 absent.

Male. Unknown.

Remarks. The armature of the labrum seems to be a useful character for distinguishing between species of bnterçpsẚs. The armature of the labrum is known for most species of the genus, with the exception of b. çnychçphçra Schellenberg, 1922. Schellenberg (1922) described for the labrum as “Oberlippe mit behaarten Borsten” (upper lip with hairy bristles). This indicates that the labrum of b. çnychçphçra is armed with 2 or more setiform processes. In the other 11 known species of bnterçpsẚs the labrum is unarmed (in three species) or armed with 2 to 8 processes (in the remaining eight species) ( Table 7 View TABLE 7 ). Therefore, the possession of a single, broadly linguiform process on the labrum is a unique feature of bnterçpsẚs hẚspẚda sp. nov.

The form and armature of the antenna of bK hẚspẚda sp. nov. also is characteristic. It is digitiform, 2-segmented, and tipped with a spine, whereas in other known species the antenna is typically broad and its distal segment is unarmed, or transformed to a claw, or armed with 2 spines (or setae). bnterçpsẚs hẚspẚda sp. nov. can be distinguished by these two diagnostic features, together with its characteristic caudal rami which are each represented by a single large seta.