Enterocola quadrisetus, 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 : 209-212

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.10530952

persistent identifier

https://treatment.plazi.org/id/3729879B-FF35-FF24-FA93-F8A6D7AE1C6E

treatment provided by

Plazi

scientific name

Enterocola quadrisetus
status

sp. nov.

Enterocola quadrisetus sp. nov.

( Figs. 134 View FIG , 135 View FIG )

Type material. Holotype ♀ (MNHN-IU-2014-21546), 3 ♀♀ paratypes (MNHN-IU-2014-21547), and 1 ♀ paratype (dissected, MNHN-IU-2014-17397) from aẚdemnum sp.; Tulear , Madagascar, depth 15 m.

Etymology. The name of the new species refers to the presence of only 4 setae on the female antenna.

Description of female. Body ( Fig. 134 View FIG A-C) small, eruciform, curved dorsally, narrowing from anterior to posterior, consisting of cephalosome, 5-segmented trunk, and unsegmented genitoabdomen. Body length of dissected largest specimen 535 μm; maximum width 192 μm (across cephalosome). Cephalosome 125 μm long, much wider than long. First pedigerous somite bearing simple dorsal tergite; second to fourth pedigerous somites each bearing pair of large dorsolateral tergal folds. Second and third pedigerous somites each bearing 1 tubercle in middle of dorsal surface, large on second pedigerous somite and smaller on third ( Fig. 134A View FIG ). Pedigerous somites lacking ventral interpodal protrusions. Genitoabdomen short, flexible, unsegmented, but with 2 or 3 wrinkles on ventral surface ( Fig. 134D View FIG ); anal prominence distinct. Caudal rami unarmed, incompletely articulated from genitoabdomen, about 3.2 times longer than wide (73×23 μm) with parallel lateral margins and rounded distal margin.

Rostrum absent. Antennule ( Fig. 134E View FIG ) unsegmented, about 1.5 times longer than wide (37×25 μm), with in- flated, convex posterior margin and nearly straight anterior margin; armed distally with 6 small setae (2 anterodistal setae setule-like). Antenna ( Fig. 134F View FIG ) indistinctly 2-segmented, 2.2 times longer than wide; proximal segment unarmed; distal segment 50×34 μm, slightly shorter than proximal segment, and ornamented with minute spinules; armed with 4 setae, lengths of setae I-IV (medial to distal) 13, 14, 21, and 23 μm, respectively; 2 lateral setae origi- nating close to each other.

Labrum ( Fig. 134G View FIG ) with sclerotized, angularly protruded lateral margins; palp inflated, bulbous, and spinulose. Mandible ( Fig. 134G View FIG ) spinulose, tapering, distinctly narrower than labral palp. Maxillule consisting of precoxa and palp; precoxa ( Fig. 134I View FIG ) with trilobate distal margin, 1 tubercle subdistally, and endite bearing thin, spinulose seta and about 15 thin setules; palp ( Fig. 134H View FIG ) with 5 spines on distal margin plus setiform process on lateral margin. Maxilla ( Fig. 134J View FIG ) 2-segmented; proximal segment with mediodistal endite bearing distally spinulose, bifurcate process; distal segment ( Fig. 134K View FIG ) bluntly tipped, subdistally with 1 stout spine bearing numerous spinules on medial surface and 1 small seta proximally on posterior surface. Maxilliped absent.

Legs 1-4 biramous with incompletely 2-segmented protopods and 1-segmented rami ( Fig. 135A, B View FIG ); protopods unarmed. Exopods of legs 1, 2, and 4 tipped with small cusp; exopod of leg 3 attenuated distally ( Fig. 135B View FIG ). Endopods 45×20, 35×24, 30×30, and 38×36 μm, respectively, in legs 1-4. Lengths of laterodistal and mediodistal setae on endopods 39 and 33, 35 and 32, 40 and 34, and 33 and 25 μm, respectively, in legs 1-4.

Leg 5 ( Fig. 135C View FIG ) lamellate, unarmed, wider than long (82×145 μm). Leg 6 ( Fig. 135D View FIG ) probably represented by 2 small cusps in genital operculum.

Male. Unknown.

Remarks. The antenna of female bnterçcçla is typically armed with 6 setae, rarely with 5 setae. bnterçcçla quad- rẚsetus sp. nov. is the only known species in the genus having only 4 setae on the antenna, which allows the new species to be easily distinguished from all of its congeners. The possession of a dorsal tubercle on the second and third pedigerous somites is another unusual feature of the new species.

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