Galathea ganindo, 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 : 123-124

Galathea ganindo n. sp.

( Fig. 41 )

Material examined. Holotype: Solomon Islands. SALOMON 1, Stn CP1801, 9°25.0'S, 160°25.9'E, 264–273 m, 1 October 2001: M 5.1 mm (MNHN-IU-2013-8452).

Paratypes: Philippines. MUSORSTOM 1, Stn 72, 14°11.8'N, 120°28.7'E, 122–127 m, 28 March 1976: 1 ov. F 3.3 mm (MNHN-IU-2013-8458).—Stn 73, 14°15'N, 120°31'E, 70–76 m, 28 March 1976: 1 ov. F 3.4 mm (MNHN- IU-2013-13941).

Indonesia. Makassar Strait. CORINDON, Stn CH 273, 1°56'S, 119°16'E, 180–220 m, 6 November 1980: 1 ov. F 5.5 mm (MNHN-IU-2013-8451).

Solomon Islands. SALOMON 1, Stn CP1801, 9°25.0'S, 160°25.9'E, 264–273 m, 1 October 2001: 1 ov. F 5.9 mm (MNHN-IU-2013-8455). SALOMON 2, Stn CP2284, 8°37.29'S, 157°21.94'E, 195–197 m, 6 November 2004: 1 M 4.3 mm (MNHN-IU-2013-8456).—Stn CP2286, 8°39.54'S, 157°23.18'E, 248–253 m, 8 November 2004: 1 M 4.7 mm, 2 ov. F 3.8–4.0 mm (MNHN-IU-2013-8457).

New Caledonia. BATHUS 1, Stn D700, 20°48’S, 165°19’E, 160–222 m, 14 March 1993: 1 M 3.9 mm (MNHN-IU-2013-8454).—Stn DW674, 20°48'S, 165°19'E, 105–110 m, 14 March 1993: 1 ov. F 3.8 mm (MNHN- IU-2013-8453).

Etymology. Ganindo was a warrior of the Solomon Islands, now an oracle-giving deity. The name is considered as a substantive in apposition.

Description. Carapace: 0.9 times as long as broad; transverse ridges with dense short setae, without long plumose setae; cervical groove distinct, laterally bifurcated. Gastric region with 8 transverse ridges: 2 epigastric ridges, anterior one medially interrupted, with 2 spines (one broken in the holotype), posterior ridge medially interrupted; 2 protogastric ridges, anterior ridge uninterrupted not extending laterally to second lateral spines, convex medially, posterior ridge uninterrupted; 1 mesogastric ridge not extending laterally to anteriormost of branchial marginal spines; 3 metagastric ridges not continuing laterally to anterior branchial ridges. One small hepatic spine near second marginal spine, sometimes absent. Anterior branchial region with distinct ridges. Midtransverse ridge uninterrupted, preceded by shallow cervical groove, followed by 7 transverse ridges, 2 of them 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, behind level of lateral limit of orbit; second, very small, at midlength between anterolateral spine and anterior cervical groove, without accompanying spine ventral to between first and second; 2 spines on anterior branchial region, last small, and 3 spines on posterior branchial margin, last small. Small spine on lateral limit of orbit; infraorbital margin with strong spine. Rostrum elongate, 2.5 as long as broad, length 0.7 postorbital carapace length and breadth 0.2 that of carapace; distance between distalmost lateral incisions 0.3 distance between proximalmost lateral incisions; dorsal surface nearly horizontal in lateral view, with numerous setae and longitudinal groove along proximal 2/3; lateral margin with 4 deeply incised sharp teeth.

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

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

Abdomen: Somites 2–5 each with 4 or 5 uninterrupted transverse ridges on tergite; somite 6 each with 2 uninterrupted or interrupted ridges, and some additional scale-like ridges. Males with G1 and G2.

Eyes: Ocular peduncles 1.5 times longer than broad, maximum corneal diameter 0.7 rostrum width.

Antennule: Article 1 with 2 spines; well-developed distodorsal and distolateral spines, distodorsal larger; distomesial spine obsolescent. Ultimate article with a few short fine setae, not in tuft on distodorsal margin.

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

Mxp3: Ischium with well-developed spine on flexor distal margin; extensor margin ending in acute angle; crista dentata with 22 or 23 denticles. Merus shorter than ischium; flexor margin with 1 strong spine at midlength, unarmed or with minute spine distally; extensor margin with distal spine, sometimes one median small spine. Carpus unarmed.

P1: 3.8 times carapace length, covered with finely setiferous scales, with scattered long setae. Merus 1.6 times length of carapace, 2.5 times as long as carpus, with spines arranged roughly in rows, dorsomesial spines stronger; distal spines prominent. Carpus 0.7 length of palm, 2.2 times as long as broad; dorsal surface with some small spines; mesial margin with 2 or 3 well-developed spines. Palm 2.7 times longer than broad, lateral and mesial margins subparallel; a few small spines arranged roughly in dorsolateral and dorsomesial rows, some small spines scattered on dorsal side. Fingers 0.8 length of palm, unarmed; each finger distally with two rows of teeth, spooned.

P2–4: moderately slender, with setose striae and numerous long plumose setae. P2 2.2 times carapace length. Meri successively shorter posteriorly (P3 merus 0.9 length of P2 merus, P4 merus 0.8 length of P3 merus); P2 merus 0.8 carapace length, 4.7 times as long as broad, 1.3 times longer than P2 propodus; P3 merus 4.2 times longer than broad, 1.1 times longer than P3 propodus; P4 merus 3.4 times as long as broad, 1.0–1.1 length of P4 propodus. Extensor margin of P2–3 meri with row of 8 or 9 proximally diminishing spines, and 4 or 5 spines on P4; ventral margins distally ending in strong spine followed proximally by several tubercles or eminences; lateral sides unarmed. Carpi with 5-7 spines on extensor margin on P2–4, distalmost smaller than distal second; lateral surface with 3 or 4 acute granules sub-paralleling extensor margin on P2–4; flexor distal margin ending in acute angle. P2–4 propodi 6.0 (P2), 6.5 (P3), 5.0 (P4) times as long as broad; extensor margin unarmed; flexor margin with 6 or 7 slender movable spines on P2–4. Dactyli distally ending in well-curved strong spine, length 0.5–0.6 that of propodi; flexor margin with 6 proximally diminishing teeth, terminal one prominent.

Epipods absent on pereiopods.

Remarks. The new species belongs to the group of species having a rostrum extremely narrow and the basal antennular article with 2 well developed spines only. The most closely related species are G. inconspicua Henderson, 1885 , G. p e ro n e n. sp., G. rhaphidia n. sp. (see Remarks of G. inconspicua ).

Distribution. Philippines, Indonesia (Makassar Strait), Solomon Islands, New Caledonia; 70– 273 m.

Figures

FIGURE 41. Galathea ganindo n. sp., holotype, male, 5.1 mm, Solomon Islands (MNHN-IU- 2013 - 8452). 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, F – H = 1 mm; E = 2.0 mm; B – D = 0.5 mm.