Neobrychiopontius galeronae, Mahatma, Radith, Arbizu, Pedro Martínez & Ivanenko, Viatcheslav N., 2008

Mahatma, Radith, Arbizu, Pedro Martínez & Ivanenko, Viatcheslav N., 2008, A new genus and species of Brychiopontiidae Humes, 1974 (Crustacea: Copepoda: Siphonostomatoida) associated with an abyssal holothurian in the Northeast Pacific nodule province *, Zootaxa 1866, pp. 290-302 : 292-296

publication ID 10.5281/zenodo.183905


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scientific name

Neobrychiopontius galeronae

sp. nov.

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 View FIGURE 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 View FIGURE 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 View FIGURE 3 C). Telson 2 times longer than second abdominal somite; anus located dorsally.

Rostrum ( Fig. 3 View FIGURE 3 E) weakly developed, slightly projecting ventrally.

Oral cone ( Fig. 3 View FIGURE 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 View FIGURE 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 View FIGURE 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 View FIGURE 5 C): gnathobase long and slender, toothed terminally; palp 2­segmented, each segment with one seta.

Maxillule ( Fig. 5 View FIGURE 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 View FIGURE 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 View FIGURE 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 View FIGURE 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 View TABLE 1 . Leg 1: first segment of exopod with falcate, strong outer spine curved inward; third exopodal segment with 2 outer spines.

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.

Leg 5 ( Figs. 8 View FIGURE 8 B): latero­ventral, 1­segmented, ornamented with spinules and armed with 4 setae. Leg 6 ( Fig. 3 View FIGURE 3 C) represented by genital flap bearing 2 setae. Colour unknown.

Male unknown.

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

Forschungsinstitut und Natur-Museum Senckenberg

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