Enterocola quadrisetus, Kim & Boxshall, 2021
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publication ID |
https://doi.org/ 10.11646/zootaxa.4978.1.1 |
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publication LSID |
lsid:zoobank.org:pub:9C7C1723-73EB-4FBE-A47A-54627DEB8F93 |
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DOI |
https://doi.org/10.5281/zenodo.10530952 |
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persistent identifier |
https://treatment.plazi.org/id/3729879B-FF35-FF24-FA93-F8A6D7AE1C6E |
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treatment provided by |
Plazi |
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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.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.