Dorsiceratus dinah, 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 : 270-280

publication ID	https://doi.org/ 10.11646/zootaxa.2096.1.15
DOI	https://doi.org/10.5281/zenodo.5333778
persistent identifier	https://treatment.plazi.org/id/260187F7-FFB7-FFC5-FF1D-FF46666CF908
treatment provided by	Felipe
scientific name	Dorsiceratus dinah
status	sp. nov.

Treatment

Dorsiceratus dinah sp. nov.

Holotype: 1 female, dissected and mounted on 15 slides, deposited at the Forschungsinstitut und Naturmuseum Senckenberg (Frankfurt, Germany), collection numbers SMF 31443/1–15.

Type locality: Atlantic Ocean, Seine Seamount, Station #756, (04.12.2003, MUC, 33°46,0’N / 14°21,9’W, 179m depth).

Etymology. The specific name of Dorsiceratus dinah sp.nov. is fondly dedicated to KHG’s twin sister, Mrs. Dinah George.

Description of female. Habitus ( Fig. 10 View FIGURE 10 ) long and slender (body length including FR 380µm). Cphth with pronounced frontal peak and dorsally with 1 pair of long spinulose cuticular processes at its distal margin, bearing small sensilla at their tips and bases. Peak with 2 tubepores near the A1 base, and with 3 pairs of sensilla; with lateral setular tufts and 1 sensillum at each side. Rostrum ( Fig. 12B View FIGURE 12 ) constricted, fused to cphth, remarkably prominent and divided distally, with 2 sensilla and 1 long tubepore at its tip. Cphth with several sensilla. Thoracic somites bearing P2–P4 each with a pair of long cuticular spiny processes at their dorsal distal margin, with sensilla at their tips and bases; with lateral setular tufts. Thoracic somites bearing P2–P5 dorsally with 1 long dorsal tubepore. Last thoracic, P6-bearing somite incompletely fused with first abdominal somite, forming a genital double somite, whose former separation is indicated by a dorsal cuticular suture; ventrally and laterally with 2 tubepores and 2 sensilla ( Fig. 11A View FIGURE 11 ). Genital double somite with 2 pairs of dorsal tubepores, second abdominal somite with 1 pair of dorsal tubepores. All abdominal somites with 2 lateral tubepores, genital double somite and second abdominal somite with additional tubepores at their ventral side. P5-bearing somite, genital double somite, and all abdominal somites each with dorsal row of long hair-like spinules at their distal margins. Third abdominal somite also with ventrally hair-like spinules and row of well-developed long spinules. All abdominal somites with dorsal pair of tubepores at distal margin. Telson without dorsal tubepore, but with 2 tubepores near the FR base ( Fig. 11A View FIGURE 11 ). Telson broader than long, trapezoid in shape; its distal margin broader than its proximal one. Anal operculum with spinules.

FR ( Fig. 11 View FIGURE 11 ) about 5 times longer than broad, bearing 2 terminal tubepores and 7 setae (I–VII). I and II insert laterally, close together. I very fine, small and bare. II unipinnate, longer than I. III bipinnate, inserts subterminally at outer margin, accompanied by a few spinules at its base. Setae IV, V, and VI insert terminally, IV and VI small and bare, V bipinnate and longest of all setae. Seta VI inserts terminally at inner margin, flanked by a few spinules. VII at dorsal side arises from small knob.

A1 ( Fig. 12A, B View FIGURE 12 ) four-segmented. First segment longest, second and third segment almost the same size, and fourth segment smallest. First and second segment with lateral row of long spinules. First segment with 1 distal seta at inner margin. Second segment with 6 setae on its outer margin and 1 seta on anterior surface. Third segment with 6 bare setae on its outer side, with strong subterminal aes, accompanied by a 7 th seta. Fourth segment with 11 bare setae and 1 small aes. Armature formula: I–1; II–7; III–7 + aes; IV –11 + aes.

A2 ( Fig. 13A View FIGURE 13 ) lacks exp. Allobasis with row of spinules and 2 abexopodal setae. Enp 1-segmented, with several long lateral spinules, 2 well-developed bipinnate setae and 1 small bare seta. There are 5 terminal setae, 3 of which geniculate. One geniculate seta bipinnate and basally fused with additional 6 th small bare seta. There are also subterminal frill carrying spinules.

Md ( Fig. 13B, C View FIGURE 13 ) Gnathobase elongate with 3 teeth, lacking seta at inner margin. Basis, enp, and exp fused, forming a long mandibular palp with 3 bipinnate and 2 unipinnate setae, with several additional spinules.

Mxl ( Fig. 13D View FIGURE 13 ) Arthrite of praecoxa with 6 terminal spines, subapically with 2 bare, slender setae. Surface with 2 bare setae. Coxa, basis, enp, and exp fused, forming a single lobe that bears 9 setae.

Mx ( Fig. 13E View FIGURE 13 ) Syncoxa and basis separate, carrying the syncoxa 2 endites. Proximal endite small, with 1 bipinnate and 1 bare seta, both well developed and equal in size. Distal endite with 1 unipinnate and 1 bare seta. Basis with 1 claw-like unipinnate seta and 1 smaller bare seta, both fused with the segment. There are 2 additional bare and slender setae. Enp distinct but very small, with 2 bare setae.

Mxp ( Fig. 14B View FIGURE 14 ) prehensile, syncoxa with a row of long lateral spinules, with subterminal row of strong spinules and 1 bipinnate seta. Basis with a transverse row of long spinules. Enp drawn out into a long bare claw, accompanied by 1 small seta at its base.

P1 ( Fig. 14A View FIGURE 14 ) with transversely elongate basis, bearing 1 bare inner and 1 outer seta (broken in Fig. 14A View FIGURE 14 ), and 1 row of long spinules on the dorsal margin. With 1 additional tubepore. Enp 2-segmented, second segment with row of long spinules at outer margin and 2 bare terminal setae. Exp 2-segmented, with exp2 longer than exp1. Exp1 with a row of long spinules along the outer margin and 1 outer bipinnate seta; exp2 with 1 outer geniculate bare seta, with 3 terminal bare, geniculate setae and with 1 subterminal long, bare seta. Also with 1 subterminal tubepore.

P2–P4 ( Figs. 15–17 View FIGURE 15 View FIGURE 16 View FIGURE 17 ) with transversely elongate bases, carrying 1 bipinnate seta on the outer distal margin, a long tubepore and several long spinules on the dorsal margin. Enps 2-segmented, first segment bare and much shorter then second; second segment with 1 bipinnate seta in P2 and 2 setae in P3 and P4 (1 seta broken in Fig. 17 View FIGURE 17 ). Enp2 with additional row of spinules at inner (P2, P3), and outer margin (P3), while bare in P4. Exps 3-segmented, with row of long spinules along the inner and outer margin of exp1 and exp2. Exp1 and exp2 equal in length, but exp3 longer than exp2. Exp3 of P2 and P3 with 1 subterminal long tubepore. Setation of P2–P4 as listed in table 2.

P5 ( Fig. 18 View FIGURE 18 ) Benp and exp fused. Anterior part of baseoendopod with long spinules and 1 bare seta in the middle, representing the enp, accompanied by 1 long tubepore. Outer basal seta arises from a small setophore, accompanied by 1 long tubepore. Exp with 2 multipinnate outer setae (1 seta broken), 1 tripinnate subterminal and 1 tripinnate terminal seta, and 1 bipinnate inner seta. There is also 1 long tubepore.

GF ( Fig. 11A View FIGURE 11 ) copulatory pore free, not covered by fused unisetose P6, which form a cuticular fold.

Male unknown.