Galathea anouchkae, Macpherson, Enrique & Robainas-Barcia, Aymee, 2015

Macpherson, Enrique & Robainas-Barcia, Aymee, 2015, Species of the genus Galathea Fabricius, 1793 (Crustacea, Decapoda, Galatheidae) from the Indian and Pacific Oceans, with descriptions of 92 new species, Zootaxa 3913 (1), pp. 1-335 : 44-46

Galathea anouchkae n. sp.

( Fig. 10 )

Material examined. Holotype: Fiji. MUSORSTOM 10, Stn CP1364, 18°11.95'S, 178°34.50'E, 80–86 m, 15 August 1998: 1 F 2.5 mm (MNHN-IU-2013-8371).

Paratypes: Fiji. MUSORSTOM 10, Stn CP1364, 18°11.95'S, 178°34.50'E, 80–86 m, 15 August 1998: 1 ov. F 3.0 mm, 1 F 2.7 mm (MNHN-IU-2013-8370). SUVA, Stn DW08, 18°22.3'S, 178°02.4'E, 28–30 m, 24 September 1999: 1 M 4.2 mm (MNHN-IU-2013-8378).

Vanuatu. MUSORSTOM 8, Stn CP961, 20°18.50'S, 169°49.90'E, 100–110 m, 21 September 1994: 3 M 3.4–3.9 mm, 3 ov. F 2.9–3.8 mm (MNHN-IU-2013-8376), 1 ov. F 3.4 mm (MNHN-IU-2013-8372).— Stn DW966, 20°18.80'S, 169°51.91'E, 128–150 m, 21 September 1994: 1 M 3.2 mm, 1 ov. F 3.4 mm, 1 F 3.0 mm (MNHN-IU- 2013-8379). TERRALIS, Stn D9, 16°39.635'S, 167°52.270'E, 136 m, 12 December 2003: 1 ov. F 3.3 mm (MNHN- IU-2013-8377).

New Caledonia. Chesterfield Islands. CHALCAL 84, Stn D29, 19°30.60'S, 158°31.10'E, 100 m, 19 July 1984: 2 M 3.0– 3.2 mm (MNHN-IU-2013-8381). New Caledonia. NORFOLK 2, Stn CP2141, 23°00.52'S, 168°19.80'E, 92–100 m, 3 November 2003: 1 M 4.8 mm (MNHN-IU-2013-8373). Lifou Island. LIFOU, Stn 1648, 20°54.1'S, 167°03.3'E, 150–200 m, 0 7 November 2000: 1 M 3.6 mm (MNHN-IU-2013-8374), 1 F 3.5 mm (MNHN-IU-2013- 8375).— Stn 1462, 20°47.1'S, 167°03.2'E, 70–120 m, 21 November 2000: 1 F 3.4 mm (MNHN-IU-2013-8380).

Etymology. This species is dedicated to Anouchka Krygelmans-Sato of the Muséum nationale d’Histoire Naturelle, Paris, for her support to crustacean collections.

Description. Carapace: as long as broad; transverse ridges with dense short setae, and a few scattered long non-plumose setae; cervical groove distinct, laterally bifurcated into anterior and posterior parts. Gastric region with 5 transverse ridges: 1 epigastric ridge with 2 submedian spines and medially interrupted; 1 protogastric ridge uninterrupted, with 1 small parahepatic spine on each side; 1 mesogastric ridge medially interrupted, not extending laterally to anterior branchial ridges; 2 metagastric ridges, anterior medially interrupted, and extending laterally to anterior branchial ridges, posterior ridge very short. One small hepatic spine on each side. Anterior branchial region with distinct ridges. Mid-transverse ridge uninterrupted, followed by 5 transverse ridges. Lateral margins slightly convex medially, with 7 spines: 2 spines in front of, and 5 spines behind, anterior cervical groove; first spine (anterolateral), well-developed, at same level of lateral limit of orbit, second spine small, located at midlength between anterolateral spine and anteriormost spine of branchial margin, accompanied by 1 additional spine ventral to between first and second; 2 spines on anterior branchial margin, posterior one smaller than anterior one, and 3 spines on posterior branchial margin, last small. Small spine on external limit of orbit; infraorbital margin with strong spine. Rostrum 1.6 times as long as broad, length 0.6 of postorbital carapace length and breadth 0.4 of carapace width; distance between distalmost lateral incisions 0.25 of distance between proximalmost lateral incisions; dorsal surface nearly horizontal in lateral view, with a few setose scales; lateral margin with 4 deeply incised sharp teeth.

Pterygostomian flap rugose, unarmed, ridges with short setae, anterior margin acutely pointed.

Sternum: As long as broad, lateral extremities gently divergent posteriorly.

Abdomen: Somites 2–4 each with anterior transverse ridge, and 1 additional uninterrupted or medially interrupted ridge; somites 5 and 6 each with 1 medially interrupted ridge, posteromedian margin of somite 6 straight. Males with G1 and G2.

Eyes: Ocular peduncles 1.3 times longer than broad, maximum corneal diameter 0.7 of rostrum width.

Antennule: Article 1 with 3 well-developed distal spines, distodorsal larger, distomesial spine smaller than others. Ultimate article with tuft of fine setae on distodorsal margin.

Antenna: Article 1 with distomesial spine reaching distal margin of article 2. Article 2 with 2 well-developed distal spines, distomesial spine slightly longer than distolateral and reaching midlength of article 3. Article 3 with small distomesial spine. Article 4 unarmed.

Mxp3: Ischium with small spine on flexor and extensor distal margins; crista dentata with 18–20 denticles. Merus shorter than ischium; flexor margin with 2 subequal spines; extensor margin unarmed.

P1: 1.9 times carapace length, covered with finely setiferous scales, with some long setae. Merus 0.8 times carapace length, 5 times as long as carpus, with some spines, dorsomesial spines stronger; distal spines prominent. Carpus 0.5 length of palm, 2.5 times as long as broad; dorsal and lateral surfaces with some spines; mesial margin with 3 or 4 spines (distal second strong). Palm 1.8 times longer than broad, lateral and mesial margins slightly convex; spines arranged in dorsolateral and dorsomesial rows, former extending onto fixed finger; dorsal surface with scattered some small spines. Fingers slightly longer than palm, movable fingers unarmed; each finger distally with two rows of teeth, spooned.

P2–4: moderately slender, with setose striae and sparse long plumose setae. P2 1.8 times carapace length. Meri successively shorter posteriorly (P3 merus 0.9 length of P3 merus, P4 merus 0.8 length of P3 merus); P2 merus 0.7 carapace length, 5.0 times as long as broad, 1.5 times longer than P2 propodus; extensor margins each with row of 7–9 proximally diminishing spines on P2–3, 2 spines on P4; ventral margins distally ending in strong spine followed proximally by 0–1 spines and several transverse ridges, lateral sides unarmed in P2–3, bearing 2 or 3 spines in P4. Carpi each with 3 or 4 spines on extensor margin in P2–3, unarmed in P4; lateral surfaces each with 1–3 spines or granules sub-paralleling extensor margin; flexor distal margins acute. Propodi 4.3–4.9 times as long as broad; extensor margins each with 0–2 proximal spines; flexor margins each with 4 slender movable spines. Dactyli distally ending in strongly curved strong spine, length 0.6–0.7 that of propodi; flexor margins each with 4 or 5 proximally diminishing teeth, terminal one prominent.

Epipods absent on pereiopods.

Remarks. The new species is closely related to G. e r yt h r i n a n. sp. from the Red Sea and G. c et i n. sp. from Papua New Guinea and New Caledonia (see the differences in Remarks of these species).

Distribution. New Caledonia, Chesterfield Islands, Vanuatu, Fiji, 28– 200 m.

Figures

FIGURE 10. Galathea anouchkae n. sp., holotype, female, 2.5 mm, Fiji (MNHN-IU- 2013 - 8371). A, carapace and abdomen, dorsal view; B, sternal plastron; C, left part of cephalothorax, ventral view, showing antennular and antennal peduncles, and anterior part of pterygostomian flap; D, ischium, merus and carpus of right Mxp 3, lateral view; E, right P 1, dorsal view; F, left P 2, lateral view; G, right P 3, lateral view; H, right P 4, lateral view. Scale: A, E – H = 1 mm; B – D = 0.5 mm.