A new genus and species of Brychiopontiidae Humes, 1974 (Crustacea: Copepoda: Siphonostomatoida) associated with an abyssal holothurian in the Northeast Pacific nodule province * Author Mahatma, Radith Author Arbizu, Pedro Martínez Author Ivanenko, Viatcheslav N. text Zootaxa 2008 1866 290 302 journal article 10.5281/zenodo.183905 d9bacc2e-6804-4efa-be7b-32e927704542 1175­5326 183905 Neobrychiopontius galeronae sp. nov. Type material — Holotype Ψ ( SMF 31444) dissected and mounted on 14 slides and 2 paratype females ( SMF 31445) preserved in ethanol, locality as below. The type material is deposited in the collection of the Senckenberg Museum, Frankfurt ( SMF ), Germany . Type locality—The nodule province in the northeast Pacific Ocean, 14° 02.37N ; 130° 06.93W , depth 4978 m , date 26/5/2004 . Etymology—The species is dedicated to the chief scientist of the cruise Joëlle Galéron (Ifremer, France ) in recognition of her scientific achievements. Description—Adult female ( Fig. 3 A). Total length excluding furca 1.4 mm, greatest width 0.74 mm. Prosome 4­segmented, flattened, narrowing anteriorly; epimeral areas of shield and tergites rounded. Urosome ( Fig. 3 B) 5­segmented, consisting of somite bearing leg 5, genital double­somite and 2 abdominal somites plus telson. Genital double­somite slightly wider than long; lateral expansions in the anterior part; gonopores located in a dorsolaterally covered by leg 6 bearing 2 small setae ( Fig. 3 C). Telson 2 times longer than second abdominal somite; anus located dorsally. Rostrum ( Fig. 3 E) weakly developed, slightly projecting ventrally. Oral cone ( Fig. 3 E, F) short and robust, with distal disk formed by labrum and labium and ornamented with setules. Egg sacs not observed. Furca ( Fig. 3 B, D) elongate, longer than 2 free abdominal somites and telson together, about 12 times longer than wide, ornamented with rows of spinules, and bearing 7 setae of different lengths (2 setae lost in holotype ), one seta is small (see Fig. 3 B). Antennule (Fig. 4 A–D) 21­segmented, with setal formula beginning with proximal segment 1, 2, 2, 2, 2, 2, 2, 2, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2+aesthetasc, 2, 4, 6. Antenna (Fig. 4 E, F; 5 A, B): small coxa without ornamentation and setation, elongate basis with spinules on outer margin. Exopod 1­segmented, with 3 smooth setae. Endopod 2­segmented; segment 1 elongate, with spinules along outer and inner margins; segment 2 short, ornamented with setules, armed with 4 setae, 1 seta long and thick, blunt­pointed and toothed terminally. Mandible ( Fig. 5 C): gnathobase long and slender, toothed terminally; palp 2­segmented, each segment with one seta. Maxillule ( Fig. 5 D) bilobed, ornamented with spinules; smaller outer lobe bearing 4 setae, three terminal and one sub­terminal; inner lobe with five terminal setae. Maxilla ( Fig. 5 E, F) 2­segmented: segment 1 wide; segment 2 elongate, with claw­like distal part; inner lob of the first segment armed with 2 setae (1 small). Maxilliped ( Fig. 6 A) syncoxa with 1 long inner seta; basis with inner seta along inner margin of the segment. Endopod 3­segmented: segment 1 with 2 short posterior setae; segment 2 with 2 longer posterior setae; segment 3 bearing 2 terminal setae, 1 seta long and thick, blunt­pointed and toothed terminally. Legs 1–4 biramous ( Figs. 6 B; 7 A, B; 8 A) with 3­segmented rami ornamented by spinules and scales, as illustrated. Formula for the armature of legs 1–4 in Table 1 . Leg 1: first segment of exopod with falcate, strong outer spine curved inward; third exopodal segment with 2 outer spines. TABLE 1. Formula of the armature of swimming legs 1–4, holotype female of Neobrychiopontius galeronae gen. nov. , sp. nov. Roman numerals indicate spines, Arabic numerals indicate setae.

Coxa	Basis	Exopod	Endopod
Leg 1 0­1	1­1	I­1;I­1;II,4	0­1;0­2;1,2,3
Leg 2 0­1	1­0	I­1;I­1;III,I,4	0­1;0­2;1,2,3
Leg 3 0­1	1­0	I­1;I­1;III,I,4	0­1;0­2;1,I,3
Leg 4 0­1	1­0	I­1;I­1;III,I,4	0­1;0­2;1,I,2

FIGURE 3. Neobrychiopontius galeronae gen. nov. , sp. nov., holotype female. A, habitus, dorsal; B, urosome, ventral, arrow to small seta; C, left leg 6 and area with gonopores, genital double­somite, dorsal, arrow to small seta; D, distal part of furca bearing 6 setae, arrow to location of missing setae; E, rostral area and oral cone, ventral. F, distal part of oral cone formed by labrum and labium, ventral. Neobrychiopontius galeronae gen. nov. , sp. nov., holotype female. A, antennule, segments 1 to 14; B, antennule, segments 15 to 21; C, antennule, segments 9 to 11; D, antennule, segments 20 to 21; E, antenna; F, antenna, terminal element and distal part of second endopodal segment. Arrows to location of missing setae. FIGURE 5. Neobrychiopontius galeronae gen. nov. , sp. nov., holotype female. A, exopod of antenna; B, second segment of antennal endopod, arrows to small setae; C, mandible, arrow to second segment of palp; D, maxillule; E, maxilla, arrow to small seta; F, distal part of second segment of maxilla. Leg 5 ( Figs. 8 B): latero­ventral, 1­segmented, ornamented with spinules and armed with 4 setae. Leg 6 ( Fig. 3 C) represented by genital flap bearing 2 setae. Colour unknown. Male unknown.