Buprorides trilobatus, 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 : 42-45

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.4822448
persistent identifier	https://treatment.plazi.org/id/3729879B-FFCC-FFDB-FA93-F9F4D5B3192B
treatment provided by	Plazi
scientific name	Buprorides trilobatus
status	gen. et sp. nov.

Treatment

Buprorides trilobatus gen. et sp. nov.

( Figs. 22 View FIG , 23 View FIG )

Type material. Holotype ♀ (MNHN-IU-2018-1949, damaged, dissected and mounted on a slide) and Paratype ♀ (MNHN-IU-2018-1950, damaged, dissected and mounted on a slide) from unidentified Didemnidae ; Mont Jumeaux west, Norfolk Ridge, North of New Caledonia, CHALCAL 2 cruise, RV “Coriolis”, Stn DW 79, depth 243 m, Bouchet, Métivier & Richer de Forges-IRD coll., 30 October 1986 .

Etymology. The specific name refers to the trilobed maxilliped of the new species.

Description of female. Body form and size unknown due to damage to specimens. Cephalosome ( Fig. 22A View FIG ) depressed, subcircular, 126×148 μm, well-defined from trunk by deep constriction. Urosome ( Fig. 24B View FIG ) wider than long, constricted anteriorly; abdomen semicircular, unarmed, shorter than leg 5. Caudal rami absent.

Rostrum ( Fig. 22C View FIG ) strongly tapering, slightly wider than long, rounded apically, not demarcated from cephalosome. Antennule ( Fig. 22D View FIG ) 5-segmented; terminal segment longest; first segment much broader than distal segments, with transverse band of sclerotization, and armed with 2 setae; second to fifth segments armed with 6, 4, 3, and 11+aesthetasc, including insertion scars of setae on terminal segment; all setae naked. Antenna ( Fig. 22E View FIG ) 3-segmented, consisting of basis and 2 endopodal segments, strongly flexed between basis and first endopodal segment; armature formula 1, 4, and 6; basis 33×13 μm; first and second endopodal segments 21×11 and 15×9 μm, respectively: distalmost seta on first endopodal segment larger than proximal 3 setae, bluntly tipped and spinulose distally; all 6 setae on second endopodal segment naked and bluntly tipped.

Labrum ( Fig. 22F View FIG ) wider than long, narrowing distally, with setules laterally on distal margin and 2 rows of minute spinules: 1 row along concave medial part of distal margin and other row on subdistal medial region of ventral surface. Mandible ( Fig. 22G, H View FIG ) consisting of coxa and 1-segmented palp; coxa with well-developed gnathobase bearing on medial margin 2 bifurcate distal teeth, 1 spinulose tooth, and proximally 3 small bifurcate spinules and 1 setule; distal margin bearing 1 small setule; palp 2.6 times longer than wide (13×5 μm), armed distally with 3 setae of unequal lengths, longest about 2.5 times longer than segment. Maxillule ( Fig. 22I View FIG ) bilobed; inner lobe (precoxa) with 7 thick, spinulose spines on medial margin; outer lobe (palp) narrower than inner lobe, armed with 2 longer subdistal and 2 shorter distal setae. Maxilla ( Fig. 22J View FIG ) consisting of syncoxa and allobasis; syncoxa broad, with 1 large mediodistal endite tipped with massive, spinulose, globular proximal element and 1 broad, spinulose distal seta; allobasis with 3 outer subdistal and 2 distal, spinulose setae (proximal of 2 distal setae broad and spiniform). Maxilliped ( Fig. 22K View FIG ) plate-like, narrowing proximally, trilobed along distal margin, unarmed, but densely ornamented with spinules on distal surface.

Legs 1-4 ( Fig. 23 View FIG A-D) biramous with 2-segmented rami, and armed only with naked setae; coxa lacking inner seta; intercoxal sclerite not discernible. Basis of leg 1 lacking inner distal element. Armature formula for legs 1-4 as follows:

Coxa Basis Exopod Endopod

Leg 1 0-0 1-0 1-0; 2, 1, 3 0-1; 1, 2, 3

Legs 2 & 3 0-0 1-0 1-0; 3, 1, 4 0-1; 2, 1, 3

Leg 4 0-0 1-0 1-0; 2, 1, 4 0-1; 1, 2, 2

Leg 5 ( Fig. 22B View FIG ) expanded, lobate, extending beyond posterior margin of abdomen, armed with 5 naked setae on rounded apex. Leg 6 absent.

Male. Unknown.

Remarks. Unfortunately, the two specimens available in this study were damaged, both with a crushed metasome. Therefore the precise body form and size are unknowable, but all the cephalic appendages and the swimming legs remained virtually intact.