Buprorides trilobatus Kim & Boxshall 2021, gen. et sp. nov.
Creators: name: Kim, Il-Hoi
name: Boxshall, Geoff A.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Cyclopoida
Buproridae
Buprorides
Buprorides trilobatus

description: Buprorides trilobatus gen. et sp. nov.   
(Figs. 22, 23)  
 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) depressed, subcircular, 126×148 μm, well-defined from trunk by deep constriction. Urosome (Fig. 24B) wider than long, constricted anteriorly; abdomen semicircular, unarmed, shorter than leg 5. Caudal rami absent.   
Rostrum (Fig. 22C) strongly tapering, slightly wider than long, rounded apically, not demarcated from cephalosome. Antennule (Fig. 22D) 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) 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) 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) 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) 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) 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) plate-like, narrowing proximally, trilobed along distal margin, unarmed, but densely ornamented with spinules on distal surface.  
Legs 1-4 (Fig. 23 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) 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.
description: Published as part of Kim, Il-Hoi & Boxshall, Geoff A., 2021, Copepods (Cyclopoida) associated with ascidian hosts: Ascidicolidae, Buproridae, Botryllophilidae, and Enteropsidae, with descriptions of 84 new species, pp. 1-286 in Zootaxa 1 on pages 42-45, DOI: 10.11646/zootaxa.4978.1.1, http://zenodo.org/record/4820443