Dorsiceratus wilhelminae, George & Plum, 2009

George, Kai Horst & Plum, Christoph, 2009, Description of two new species of Dorsiceratus Drzycimski, 1967 (Copepoda: Harpacticoida: Ancorabolidae) from Sedlo and Seine Seamounts (Northeastern Atlantic) and remarks on the phylogenetic status of the genus *, Zootaxa 2096 (1), pp. 257-286 : 259-262

publication ID	https://doi.org/ 10.11646/zootaxa.2096.1.15
DOI	https://doi.org/10.5281/zenodo.5333776
persistent identifier	https://treatment.plazi.org/id/260187F7-FFB8-FFD7-FF1D-FB50665CFF48
treatment provided by	Felipe
scientific name	Dorsiceratus wilhelminae
status	sp. nov.

Treatment

Dorsiceratus wilhelminae sp. nov.

Holotype: 1 female, dissected and mounted on 17 slides, deposited at the Forschungsinstitut und Naturmuseum Senckenberg (Frankfurt, Germany), collection numbers SMF 31442/1–17.

Type locality: Atlantic Ocean, Sedlo Seamount, station #728 (27.11.2003, Giant Boxcorer, 40°18,5’N / 26°42,0’W, 856m depth).

Etymology. The specific name of Dorsiceratus wilhelminae sp. nov. is given in grateful rememberance to the grandmother of CP, Mrs. Anna Wilhelmina Plum.

Description of female. Habitus ( Fig. 1 View FIGURE 1 ) long and slender (body length including FR 395µm). Cphth bearing a pair of cuticular processes with small apical sensilla and small spinules, each of which are accompanied by another sensillum at their bases. Cphth anteriorly drawn into a peak with 2 tubepores. Rostrum ( Fig. 3B View FIGURE 3 ) constricted, fused to cphth, strongly prominent, about 2 times longer than broad, divided distally, with 2 sensilla and 1 long tubepore at its tip. Cphth with several sensilla, with anterolateral setular tufts. Body somites also with lateral setular tufts. Thoracic body somites bearing P2–P4 each with 1 pair of dorsal cuticular spiny processes bearing sensilla at their tips and bases. Each thoracic body somite with 1 dorsal, long tubepore. First abdominal somite ventrally fused with last thoracic body somite to form the genital double somite. First and second abdominal somite ventrally and dorsally with 2 tubepores, each with a sensillum; dorsal tubepores flanked by a row of dorsal spinules ( Fig. 1 View FIGURE 1 and 2A View FIGURE 2 ). Third abdominal somite with 1 dorsal tubepore. Abdominal somites (except telson) with posterior dorsal and ventral row of long hair-like spinules. In addition the third abdominal somite with dorsal and ventral strong and long spinules. Telson broader than long, without dorsal tubepore, but with 2 tubepores near the FR´s base ( Fig. 2A View FIGURE 2 ). Anal operculum with spinules.

FR ( Fig. 2B View FIGURE 2 ) slender, about 4 times longer than broad, bearing 7 setae and terminally ending in 1 short but broad, and 1 slender tubepore. Setae I and II inserting laterally, close together. Seta I very fine, small and bare. Seta II bipinnate, longer than I. Seta III (broken) inserting subterminally at outer margin, accompanied by a few spinules basally. Seta IV and V (both broken) inserting terminally. Seta VI bare, inserting terminally at inner margin and flanked by a few spinules. Seta VII arising dorsally from small knob.

A1 ( Fig. 3A, B View FIGURE 3 ) 4-segmented. First segment ( Fig. 3B View FIGURE 3 ) longest, second and third segment almost the same size, fourth segment smaller. First and second segments with a row of long spinules. First segment with 1 small, distal, bipinnate seta ( Fig. 3B View FIGURE 3 ). Second segment with 7 setae. Third segment with 6 bare setae on its outer side, with strong subterminal aes, accompanied by a 7 th seta. Fourth segment with 10 bare setae, one of which fused with 1 small aes. Armature formula: I–1; II–6; III–7 + aes, IV –10 + aes.

A2 ( Fig. 4A View FIGURE 4 ) lacking exp. Allobasis with row of spinules and 2 abexopodal setae. Enp with lateral (several) long spinules, 2 well-developed bipinnate setae, and 1 small bare seta. Terminal end of A2 with 3 long, geniculate setae, one of which fused with small bare seta. In addition there are 2 unipinnate smaller setae. Subterminally with frill carrying spinules.

Md damaged, not illustrated.

Mxl ( Fig. 4C View FIGURE 4 ) arthrite of praecoxa with 6 terminal spines and 1 bare seta. On surface with row of long spinules and 2 bare setae. 2 subapical bare and slender setae. Coxal endite with 1 bare and 1 unipinnate blunt seta. Basis, enp, and exp fused, forming a single lobe with 6 bare and 1 pinnate setae.

Mx ( Fig. 4D View FIGURE 4 ) syncoxa and basis separate, syncoxa with 2 endites and several spinules. Proximal endite small, with 1 strong unipinnate seta, fused with the segment, and 1 smaller bare seta. Distal endite with 2 strong unipinnate setae. Basis with 1 unipinnate and 1 bare strong seta, both fused with segment. First seta drawn out into long claw-like spine. In addition it has 2 bare and slender setae. Enp fused with basis, represented by 2 bare setae.

Mxp ( Fig. 4B View FIGURE 4 ) prehensile, syncoxa with row of short, but strong spinules and 1 unipinnate seta. Basis with row of long spinules. Enp drawn out into long bare claw, with 1 small seta at its base.

P1 ( Fig. 5 View FIGURE 5 ) with transversely elongate basis, bearing 1 bare inner and 1 bipinnate outer seta, and 1 row of long spinules on the dorsal margin. Enp broken. Exp 2-segmented, with exp2 much longer than exp1. Exp1 with 1 outer bipinnate seta; exp2 with row of long spinules along the inner margin, and with 1 outer unipinnate seta; with 4 terminal, bare, geniculate setae, the innermost translocated subterminally. Finally there is also a tubepore.

P2–P4 ( Figs. 6–8 View FIGURE 6 View FIGURE 7 View FIGURE 8 ) with transversely elongate bases, each carrying 1 bipinnate seta on the outer distal margin, a long tubepore and several long spinules on the dorsal margin. Enps broken. Exps 3-segmented, P2 exp1 and exp2 with row of long spinules along inner margin, exp3 with long subterminal tubepore. Outer setae of P2 exp1 and exp2, as well as terminal setae of exp3 slightly malformed. Exp3 of P2 also deformed at its inner margin, beneath the insertion of the inner seta. P3 exp2 with long spinules along inner margin. Setation of P2–P4 as listed in table 1.

P5 ( Fig. 9 View FIGURE 9 ) benp and exp separate. Benp with long anterior spinules. Endopodal lobe completely reduced, represented by 1 bare and 1 bipinnate seta that is accompanied by 2 long tubepores. Outer seta of benp arising from small setophore, accompanied by spinules and long tubepore. Exp with 1 bipinnate outer seta, with 1 subterminal small bipinnate seta; with terminal triplumose (1) and bipinnate (1) setae, and with 1 bipinnate inner seta, accompanied by long tubepore and bearing 1 small tubepore at its tip.

GF ( Fig. 2A View FIGURE 2 ) gonopores and copulatory pore free, not covered by P6, which are fused and form a cuticular fold, with 2 small setae.

Male unknown.