Galathea barbata, 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 : 57-59

Galathea barbata n.sp.

( Fig. 15 )

Material examined. Holotype: New Caledonia. Chesterfield Islands. CORAIL 2, Stn DW9, 20°53'S, 161°35'E, 62 m, 20 July 1988: 1 M 3.9 mm (MNHN-IU-2013-15845).

Paratypes: New Caledonia. Chesterfield Islands. CHALCAL 84, Stn D1, 21°15.04'S, 162°15.41'E, 48 m, 13 July 1984: 1 M 2.9 mm, 1 ov. F 2.7 mm (MNHN-IU-2013-15854).—Stn D36, 19°45.37'S, 158°32.03'E, 50 m, 21 July 1984: 1 ov. F 3.3 mm (MNHN-IU-2013-15846).—Stn D51, 21°13.21'S, 158°42.50'E, 55 m, 24 July 1984: 1 M 3.2 mm, 1 ov. F 4.0 mm (MNHN-IU-2013-15853).—Stn D55, 21°23.90'S, 158°59.60'E, 55 m, 25 July 1984: 1 M 4.3 mm (MNHN-IU-2013-15847).—Stn CP15, 21°24.90'S, 159°09.30'E, 60 m, 25 July 1984: 1 M 4.0 mm (MNHN-IU-2013-15851). CORAIL 2, Stn DW8, 20°52'S, 161°38'E, 63 m, 20 July 1988: 3 ov. F 3.6–3.7 mm (MNHN-IU-2013-15848).—Stn CP22, 20°33'S, 161°01'E, 85–88 m, 22 July 1988: 1 M 3.5 mm (MNHN-IU-2013- 13971).— Stn CP24, 20°27'S, 161°05'E, 74–75 m, 22 July 1988: 1 M 3.5 mm (MNHN-IU-2013-15850).—Stn DW115, 19°22'S, 158°38'E, 44 m, 28 July 1988: 1 ov. F 3.8 mm (MNHN-IU-2013-15849).— Stn DW165, 19°41'S, 158°19'E, 45 m, 2 August 1988: 1 ov. F 3.5 mm (MNHN-IU-2013-15852).

New Caledonia. Pines Island. Stn 583, 22°45'S, 167°29'E, 44 m, 18 July 1985: 1 M 3.8 mm (MNHN-IU-2013- 13972).

Etymology. From the Latin barbatus, bearded, in reference to the numerous setae on the body.

Description. Carapace: As long as broad; transverse ridges with dense short setae and some scattered long non-plumose setae; cervical groove distinct, laterally bifurcated into anterior and posterior parts. Gastric region with 8 transverse ridges: 1 epigastric ridge uninterrupted, with 2 submedian spines; 2 protogastric ridges, anterior one uninterrupted, medially convex, with 1 parahepatic spine on each side, posterior ridge medially interrupted; median scale between posterior protogastric ridge and anterior mesogastric ridge; 2 mesogastric ridge, anterior ridge uninterrupted, not extending laterally to anterolateral spines, posterior ridge scale-like; 3 metagastric ridges not extending laterally to anterior branchial region, posterior one very short; some additional scattered scale-like ridges between main ridges. Anterior branchial region with distinct ridges. Mid-transverse ridge uninterrupted, preceded by cervical groove, followed by 6 transverse ridges, 3 of them uninterrupted. Lateral margins convex medially, with 8 spines: 2 spines in front of and 6 spines behind anterior cervical groove; first (anterolateral) spine well-developed, behind level of lateral limit of orbit; second spine small, located at midlength between anterolateral spine and anteriormost spine of branchial margin, with strong additional spine ventral to between first and second spines; 3 spines on anterior branchial margin, and 3 spines on posterior branchial margin, last small. External limit of orbit with spine; infraorbital margin with strong spine. Rostrum 1.8 as long as broad, length 0.6 of postorbital carapace length and breadth 0.3 of carapace breadth; distance between distalmost lateral incisions 0.3 of distance between proximalmost lateral incisions; dorsal surface nearly horizontal in lateral view, with numerous setae; lateral margin with 4 deeply incised sharp teeth.

Pterygostomian flap rugose, unarmed, ridges with short setae, anterior margin ending in spine.

Sternum: 0.8 times as long as broad, lateral extremities gently divergent posteriorly. Some specimens with 1 spine on each side of distolateral margin of sternite 4.

Abdomen: Somites 2–3 each with 4 uninterrupted transverse ridges on tergite; somite 4 with 2 uninterrupted and 2 interrupted ridges; somite 5 with 2 uninterrupted; somite 6 with 2 medially interrupted ridges, posteromedian margin slightly convex. Males with G1 and G2.

Eyes: Ocular peduncles 1.3 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 distomesial spine not reaching distal margin of article 2. Article 2 with 2 welldeveloped distal spines, distolateral spine slightly longer than distomesial and exceeding midlength of article 3. Articles 3 and 4 unarmed.

Mxp3: Ischium with well-developed spine on flexor distal margin; extensor margin ending in acute angle; crista dentata with 18–20 denticles. Merus shorter than ischium; flexor margin with 2 strong subequal spines; extensor margin with 2 small spines. Carpus unarmed.

P1: 2.8 times carapace length, covered with finely setiferous scales, with scattered long non-plumose setae. Merus 1.1 times length of carapace, 1.6 times as long as carpus, with spines arranged in longitudinal rows, dorsomesial spines stronger; other distal spines also prominent. Carpus 0.7 length of palm, 1.6 times as long as broad; dorsal surface with some small spines; mesial margin with 4 or 5 strong spines. Palm 1.7 times longer than broad; some small spines arranged in dorsolateral and dorsomesial rows, both rows continuing along fixed and movable fingers, respectively; some small spines scattered on dorsal side. Fingers 0.6 length of palm, each finger distally with 2 rows of teeth, spooned.

P2–4: moderately slender, with setose striae and numerous long, non-plumose setae. P2 1.7 times carapace length. Meri successively shorter posteriorly (P3 merus 0.8 length of P2 merus, P4 merus 0.8 length of P3 merus); P2 merus 0.7 of carapace length, 3.9 times as long as broad, 1.5 times longer than P2 propodus; P3 merus 2.9 times longer than broad, 1.2 times longer than P3 propodus; P4 merus 2.8 times as long as broad, 1.2 length of P4 propodus; extensor margins each with row of 8–10 proximally diminishing spines in P2–3, 6 spines in P4; ventral margins distally ending in strong spine followed proximally by several tubercles or transverse ridges; lateral sides unarmed. Carpi each with 4 spines on extensor margin in P2, 0–1 spines in P3–4; lateral surfaces each with 3 or 4 small spines or acute granules sub-paralleling extensor margin in P2–4; flexor distal margins ending in acute angle. P2–4 propodi 4.0–4.4 times as long as broad; extensor margins unarmed; flexor margins each with 6 or 7 slender movable spines on P2–4. Dactyli distally ending in noticeably curved strong spine, 0.6–0.7 times as long as propodi; flexor margins each with 5 or 6 proximally diminishing teeth, terminal one prominent.

Epipods on P1, sometimes on P2.

Remarks. The new species resembles G. punctata n. sp. from the Philippines to New Caledonia and G. h i s p i d a Baba, 2005 from Indonesia (see Remarks of G. punctata n. sp.).

Distribucion. New Caledonia, Chesterfield Islands, 44– 88 m.

Figures

FIGURE 15. Galathea barbata n. sp., holotype, male, 3.9 mm, New Caledonia, Chesterfield Islands (MNHN-IU- 2013 - 15845). 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.