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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 4 segmented, flattened, narrowing anteriorly; epimeral areas of shield and tergites rounded. Urosome (Fig. 3 B) 5 segmented, 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) 21 segmented, 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 1 segmented, with 3 smooth setae. Endopod 2 segmented; 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 2 segmented, 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) 2 segmented: 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 3 segmented: 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 3 segmented 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. 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 B): lateroventral, 1 segmented, ornamented with spinules and armed with 4 setae. Leg 6 (Fig. 3 C) represented by genital flap bearing 2 setae. Colour unknown. Male unknown. |
