Galathea patriciae, 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 : 215-217

Galathea patriciae n. sp.

( Fig. 77 )

Material examined. Holotype: Wallis and Futuna. MUSORSTOM 7, Stn CP498, 14°18.9'S, 178°03.1'W, 105–160 m, 10 May 1992: F 3.8 mm (MNHN-IU-2013-13604).

Paratypes: Wallis and Futuna. MUSORSTOM 7, Stn CP498,14°18.9'S, 178°03.1' W, 105–160 m, 10 May 1992: 16 M 2.6–5.5 mm, 7 ov. F 3.3–5.4 mm, 2 F 3.2–3.8 mm (MNHN-IU-2013-13605).

Etymology. This species is dedicated to Patricia Cabezas of the Museo Nacional de Ciencias Naturales, Madrid, for her support to crustacean taxonomy.

Description. Carapace: As broad as long; transverse ridges with dense short setae, and a few scattered long non plumose setae; cervical groove distinct, laterally bifurcated. Gastric region with some transverse ridges: 1 epigastric ridge unarmed and usually uninterrupted; 2 protogastric ridges, anterior ridge uninterrupted, without or with minute parahepatic spine on each side, posterior ridge median, short, sometimes interrupted, without long thick setae; 1 mesogastric ridge uninterrupted or medially interrupted, not extending laterally to anteriormost of branchial marginal spines; 2 metagastric ridges, anterior ridge sometimes medially interrupted, not continuing laterally to anteriorbranchial ridge, posterior ridge short, sometimes absent. Hepatic region with small spine near first marginal (anterolateral) spine. Anterior branchial region with distinct ridges. Mid-transverse ridge uninterrupted, preceded by shallow cervical groove. Posterior branchial region with 5 transverse ridges, sometimes 1 ridge uninterrupted. Lateral margins well convex medially, with 7 spines: 2 spines in front of, and 5 spines behind, anterior cervical groove; first anterolateral, well-developed, at same level of lateral limit of orbit, second, small, at midlength between anterolateral spine and anteriormost spine of branchial margin, with spine ventral to between first and second; 2 spines on anterior branchial region, last small, and 3 spines on posterior branchial margin. Small spine on lateral limit of orbit; infraorbital margin with strong spine. Rostrum 1.8–2.0 times as long as broad, length 0.7–0.8 postorbital carapace length and breadth 0.3 that of carapace; distance between distalmost lateral incisions 0.3 distance between proximalmost lateral incisions; dorsal surface nearly horizontal in lateral view, with numerous small scale-like setose ridges; lateral margin with 4 deeply incised teeth.

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

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

Abdomen: Somites 2–4 each with 2 uninterrupted transverse ridges on tergite; somites 5 and 6 each with 2 scale-like ridges, posteriormedian margin of somite 6 straight. Males with G1 and G2.

Eyes: Ocular peduncles 1.5 times longer than broad, maximum corneal diameter 0.6 rostrum width.

Antennule: Article 1 with 3 well-developed distal spines, distodorsal larger. Ultimate article with a few short fine setae not in tuft on distodorsal margin.

Antenna: Article 1 with ventral distomesial spine reaching distal margin of article 2. Article 2 with 2 distal spines, distolateral spine longer than distomesial and exceeding midlength of article 3. Articles 3 and 4 unarmed.

Mxp3: Ischium with flexor margins ending in small spine, extensor margin ending in acute angle; crista dentata with 20–21 denticles. Merus as long as ischium; flexor margin with 2 spines, proximal spine longer than distal; extensor margin acute. Carpus unarmed.

P1: 3.0–3.6 times carapace length, with numerous setiferous scales, and some scattered long setae. Merus 1.5 times carapace length, 1.9–2.1 times as long as carpus, with some spines, dorsomesial and distal spines stronger than others. Carpus 0.8–0.9 length of palm, 2.4–2.5 times as long as broad; dorsal surface with some small spines; mesial margin with row of spines, distal second stronger than others. Palm 2.1–2.7 times longer than broad, lateral and mesial margins subparallel; small spines arranged roughly in dorsal, dorsolateral and dorsomesial rows. Fingers as long as palm, each finger with two rows of teeth distally spooned; fingers unarmed.

P2–4: long and slender, with some setose striae and sparse long plumose setae. P2 2.0–2.2 times carapace length. Meri successively shorter posteriorly (P3 merus 0.8–0.9 length of P2 merus, P4 merus 0.8 length of P3 merus); P2 merus 0.9 carapace length, 4.5 times as long as broad, 1.3–1.4 times longer than P2 propodus. P3 merus 3.7 times as long as broad, 1.3–1.4 times longer than P3 propodus. P4 merus 3.5 times as long as broad, as long as P4 propodus. Extensor margin with row of 8–10 proximally diminishing spines on P2–3, 0–1 spines on P4; ventral margins distally ending in strong spine, and 1–4 additional distal spines, lateral sides with 0–2 spines on P4 only. Carpi with 2–4 spines on extensor margin on P2–3, unarmed on P4; lateral surface with 3 or 4 small spines or granules sub-paralleling extensor margin; flexor distal margin acute. Propodi 5.0–5.5 times as long as broad; extensor margin unarmed, sometimes with proximal spine on P2; flexor margin with 4–6 slender movable spines. Dactyli distally ending in well-curved strong spine, length 0.4–0.5 that of propodi; flexor margin with 4 or 5 proximally diminishing teeth, terminal one prominent.

Epipods present on P1.

Remarks. Galathea patriciae n. sp. is very close to G. b o i s s el i e r a e n. sp. from the Philippines to New Caledonia, and G. p ro v i d e n t i a Laurie, 1926 from the southwestern Indian Ocean and Western Pacific, from the Philippines, to New Caledonia, and Fiji (see Remarks of G. providentia ). These three species are also related to G. ternatensis (see Remarks of this species).

No genetic data are available for G. patriciae .

Distribution. Wallis and Futuna, 105– 160 m.

Figures

FIGURE 77. Galathea patriciae n. sp., holotype, female, 3.8 mm, Wallis and Futuna (MNHN-IU- 2013 - 13604). A, carapace and abdomen, dorsal view; B, thoracic sternites 3 and 4; 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, right 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.