Galathea halia, 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 : 133-135

Galathea halia n. sp.

( Figs 45 , 117 A, B)

? Galathea whiteleggii . — Dong & Li, 2010: 22 , fig. 14 (South China Sea, 46–105 m) (not G. whiteleggii Grant & McCulloch, 1906 ).

Material examined. Holotype: Vanuatu. SANTO, Stn AT116, 15°32.9'S, 167°16.2'E, 153–196 m, 18 October 2006: ov. F 4.2 mm (MNHN-IU-2013-13515).

Paratypes: Philippines. MUSORSTOM 1, Stn CP18, 13°56'N, 120°16'E, 150–159 m, 21 March 1976: 1 M 2.2 mm (MNHN-IU-2013-13527).—Stn CP73, 14°15'N, 120°31'E, 70–76 m, 28 March 1976: 2 M 2.5–3.2 mm, 3 ov. F 2.5–2.7 mm (MNHN-IU-2013-13557). MUSORSTOM 2, Stn CP47, 13°33'N, 122°10'E, 81–84 m, 26 November 1980: 1 ov. F 3.1 mm (MNHN-IU-2013-13522); 2 M 2.3–2.4 mm, 2 ov. F 3.0– 3.1 mm, 1 F 2.8 mm (MNHN-IU- 2013-13523).

Indonesia. Makassar Strait. CORINDON, Stn DR258, 1°56.8'S, 119°17.3'E, 30 m, 6 November 1980: 1 M 3.9 mm (MNHN-IU-2013-13530).

Solomon Islands. SALOMON 2, Stn CP2296, 8°46.64'S, 157°30.62'E, 124–139 m, 7 November 2004: 1 M 3.4 mm (MNHN-IU-2013-13516).

Vanuatu. BOA 1, Stn CP2440, 15°07.14'S, 166°57.63'E, 100–215 m, 12 September 2005: 1 ov. F 4.1 mm (MNHN-IU-2013-13531). SANTO, Stn DB16Light, 15°35.5'S, 167°15.8'E, 32–40 m, 14 September 2006: 2 M 2.5–2.7 mm (MNHN-IU-2013-13532).—Stn AT4, 15°32.9–33.1'S, 167°13.3–13.7'E, 97–101 m, 15 September 2006: 1 ov. F 3.2 mm (MNHN-IU-2013-13517).—Stn AT14, 15°24'S, 167°13.5'E, 102–120 m, 19 September 2006: 1 M 4.2 mm (MNHN-IU-2013-13542).—Stn AT30, 15°36.7'S, 167°02.6'E, 83–120 m, 25 September 2006: 1 M 3.6 mm, 2 ov. F 3.4–4.0 mm (MNHN-IU-2013-13533).—Stn AT42, 15°37.5'S, 167°02.3'E, 112–148 m, 28 September 2006: 1 F 2.7 mm (MNHN-IU-2013-13518), 1 F 3.0 mm (MNHN-IU-2013-13519).—Stn AT44, 15°36.5'S, 167°02.7'E, 86–118 m, 29 September 2006: 1 ov. F 4.3 mm (MNHN-IU-2013-13528); 1 M 4.0 mm (MNHN-IU-2013-13545); 1 M 2.5 mm, 1 ov. F 3.1 mm (MNHN-IU-2013-13544).—Stn AT45, 15°37.5'S, 167°02.7'E, 148–188 m, 29 September 2006: 1 M 2.4 mm (MNHN-IU-2013-13536).—Stn AT50, 15°36.8'S, 167°14.1'E, 140–153 m, 30 September 2006: 1 M 4.1 mm (MNHN-IU-2013-13537).—Stn AT56, 15°36.1'S, 167°01.3'E, 98–105 m, 2 October 2006: 2 M 2.6–3.8 mm, 2 ov. F 2.8–3.4 mm (MNHN-IU-2013-13539).—Stn AT57, 15°36.3'S, 167°01.4'E, 106–126 m, 2 October 2006: 1 M 4.2 mm (MNHN-IU-2013-13529).—Stn FP50, 15°36.8'S, 167°08.7'E, 25 m, 4 October 2006: 3 M 2.5–3.1 mm, 3 F 2.2–2.6 mm (MNHN-IU-2013-13538). Stn ZR12, 15°36.7'S, 167°02.0'E, 2–30 m, 5 October 2006: 5 M 2.0– 3.4 mm, 4 ov. F 2.5–3.1 mm (MNHN-IU-2013- 13558).—Stn DB14, 15°30.9'S, 167°11'E, 10–14 m, 13 October 2006: 1 M 2.0 mm (MNHN-IU-2013- 13543).—Stn EP32, 15°36.6'S, 167°02.0'E, 100 m, 14 October 2006: 4 M 2.5–3.6 mm, 1 ov. F 3.1 mm, 2 F 2.6–3.4 mm (MNHN-IU-2013-13534).—Stn EP35, 15°34.9–35.1'S, 167°13.9–14.1'E, 10–51 m, 15 October 2006: 3 M 2.4–2.6 mm, 1 F 2.0 mm (MNHN-IU-2013-13541).—Stn EP39, 15°33.6–33.7'S, 167°16.3–16.5'E, 75–80 m, 17 October 2006: 2 F 1.9-2.0 mm (MNHN-IU-2013-13535).—Stn NR64, 15°31.5'S, 167°14.1'E, 22 m, 18 October 2006: 1 M 2.1 mm (MNHN-IU-2013-13540).

New Caledonia, Touho, 20°47'S, 165°13'E, 52 m, 4 September 1993: 1 M 4.6 mm (MNHN-IU-2013-13521); 1 M 4.5 mm (MNHN-IU-2013-13520).— 20°47'S, 165°13'E, 56 m, 7 September 1993: 1 ov. F 5.0 mm (MNHN-IU- 2013-13526).— 20°44'S, 165°14'E, no depth, 5 May 1993: 1 M 4.0 mm, 1 ov. F 3.6 mm (MNHN-IU-2013-13553). Lagon, Stn 745, 22°13.6'S, 167°02.8'E, 78-80 m, August 1986: 1 M 2.8 mm (MNHN-IU-2013-13551). Lagon East, Stn 652, 21°49.5'S, 166°35.2'E, 55–62 m, August 1986: 1 ov. F 3.4 mm (MNHN-IU-2013-13548).—Stn 741, 22°14.8'S, 167°02.8'E, 77–80 m, August 1986: 1 M 5.2 mm, 1 ov. F 4.2 mm (MNHN-IU-2013-13552).—Stn 742, 22°13.9'S, 167°02.8'E, 78 m, August 1986: 1 M 4.3 mm, 1 ov. F 4.7 mm (MNHN-IU-2013-13554).—Stn 836, 20°46.4'S, 165°15.75'E, 57 m, 11 January 1987: 1 M 5.2 mm, 2 ov. F 3.6–5.5 mm (MNHN-IU-2013-13549). Ouen Island, Stn 150, 22°30.1'S, 166°50.4'E, 62–68 m, August 1984: 2 M 4.0– 5.2 mm, 2 ov. F 3.0– 3.9 mm (MNHN-IU- 2013-13550). South Reef, Stn 325, 22°26'S, 167°02'E, 75 m, 28 November 1984: 1 M 4.5 mm, 3 ov. F 4.4–5.2 mm (MNHN-IU-2013-13547).—Stn 328, 22°28'S, 167°03'E, 72 m, 28 November 1984: 1 M 4.2 mm, 1 ov. F 3.1 mm (MNHN-IU-2013-13546). BATHUS 1, Stn CP680, 20°48'S, 165°17'E, 86-92 m, 15 March 1993: 2 M 3.7–4.5 mm, 3 ov. F 3.0– 6.4 mm (MNHN-IU-2013-13525); 1 ov. F 3.8 mm (MNHN-IU-2013-13524).

Australia. NW Australia, 19°47.22'S, 115°28.20'E, 90–108 m, 12 June 2007: 1 M 3.2 mm ( J57272 ).

Etymology. The name Halia refers to one of the Nereids of Greek mythology. The name is considered as a substantive in apposition.

Description. Carapace: As long as broad; transverse ridges with dense short setae, and some scattered long plumose setae; cervical groove distinct, laterally bifurcated. Gastric region with 6 transverse ridges: 1 epigastric ridge with 2–4 spines, medially convex and interrupted; 2 protogastric ridges, anterior one unarmed and uninterrupted, posterior ridge short, arcuate, with some long plumose setae; 1 mesogastric ridge uninterrupted and not extending laterally to anteriormost of branchial marginal spines; 2 metagastric ridges, anterior one uninterrupted and not continuing laterally to anterior branchial ridges, posterior ridge scale-like. Hepatic region with small spine. Anterior branchial region with distinct ridges. Mid-transverse ridge uninterrupted, preceded by shallow cervical groove. Posterior branchial region with 5 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, slightly behind of lateral limit of orbit, second, small, at midlength between anterolateral spine and anteriormost spine of branchial margin, with small 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 limit of orbit; infraorbital margin with strong spine. Rostrum 1.5–1.7 times as long as broad, length 0.6 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 sharp teeth.

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

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

Abdomen: Somites 2–3 each with 2 uninterrupted transverse ridges on tergite, sometimes with additional small scale-like ridges; somite 4 with 2 transverse ridges, posterior ridge medially interrupted; somites 5 and 6 each with medially interrupted ridge. 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, distomesial spine slightly smaller than others. Ultimate article with some fine setae not in tuft on distodorsal margin.

Antenna: Article 1 with ventral distomesial spine not reaching distal margin of article 2. Article 2 with 2 distal spines, distolateral spine clearly longer than distomesial, and exceeding midlength of article 3. Article 3 unarmed or with small distomesial spine. Article 4 unarmed.

Mxp3: Ischium with flexor margins ending in spine, extensor margin ending in acute angle; crista dentata with 19–21 denticles. Merus shorter than ischium; flexor margin with 2 or 3 spines, distal and median (when present) spines smaller than proximal; extensor margin ending in small spine or acute angle. Carpus unarmed.

P1: 2.5–3.0 times carapace length, somewhat depressed on palm, more so on fingers, with numerous setiferous scales, and some scattered long setae. Merus 1.2 times carapace length, 1.8 times as long as carpus, with some spines, dorsomesial and distal spines stronger than others. Carpus 0.7 length of palm, 2.1 times as long as broad; dorsal surface with some small spines; mesial margin with row of 3 or 4 spines, distal second stronger than others. Palm 2.0–2.2 times longer than broad, lateral and mesial margins subparallel; small spines arranged roughly in dorsal, dorsolateral and dorsomesial rows. Fingers 0.7 times palm length, 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 times carapace length. Meri successively shorter posteriorly (P3 merus 0.8 length of P3 merus, P4 merus 0.8 length of P3 merus); P2 merus 0.8 carapace length, 3.9 times as long as broad, 1.4 times longer than P2 propodus. P3 merus 3.2 times as long as broad, slightly longer than P3 propodus. P4 merus 3.0 times as long as broad, as long as P4 propodus. Extensor margin with row of 8 proximally diminishing spines on P2–3, 1 distal spine on P4; ventral margins distally ending in strong spine, lateral sides unarmed on P2–3, with 2 spines on P4. Carpi with 4 spines on extensor margin on P2–3, 2 distal spine on P4; lateral surface with 3 or 4 small spines or acute granules sub-paralleling extensor margin; flexor distal margin with distal spine. Propodi 4.0–4.7 times as long as broad; extensor margin with 0–2 minute proximal spines; flexor margin with 5 or 6 slender movable spines. Dactyli distally ending in wellcurved strong spine, length 0.6–0.7 that of propodi; flexor margin with 5 or 6 proximally diminishing teeth, terminal one prominent.

Epipods present on P1.

Coloration. Base color light brown. Carapace and abdomen, sometimes with a few scattered white spots. Long setae on carapace and abdomen reddish. P1 whitish or reddish brown, base of fingers whitish or light brown. P2–4 with whitish and reddish brown stripes.

Remarks. This new species closely resembles G. lemaitrei n. sp. from the Red Sea and G. autahi n. sp. from the French Polynesia, Vanuatu, New Caledonia, and New South Wales (see Remarks of G. lemaitrei ). The specimens from the Philippines have a few long plumose setae and more small setae than in other localities. However, we have considered these differences as intraspecific variations. Dong & Li (2010) collected some material from South China Sea, identified as G. whiteleggii . The illustrations and data provided by these authors match quite well with G. h a l i a, nevertheless a direct comparison with the specimens from Dong & Li would confirm their status.

Distribution. Philippines, South China Sea, Indonesia (Makassar Strait), Solomon Islands, NW Australia, Vanuatu, New Caledonia; 2– 196 m.

Figures

FIGURE 45. Galathea halia n. sp., holotype, ovigerous female, 4.2 mm, Vanuatu (MNHN-IU- 2013 - 13515). 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, 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.

FIGURE 117. Dorsal view. A, Galathea halia n. sp., Vanuatu, ovigerous female 3.2 mm (MNHN-IU- 2013 - 8110). B, Galathea halia n. sp., Vanuatu, ovigerous female 3.2 mm (MNHN-IU- 2013 - 13528). C, Galathea imitata n. sp., Western Australia, ovigerous female 3.2 mm (UF 21915). D, Galathea imitata n. sp., Western Australia, male 3.6 mm (UF 22483). E, Galathea inconspicua Henderson, 1885, Vanuatu, male 5.1 mm (MNHN-IU- 2013 - 8507). F, Galathea inflata Potts, 1915, Papua New Guinea, ovigerous female 6.3 mm (MNHN-IU- 2013 - 509). G, Galathea lemniscata n. sp., New Caledonia, Chesterfield islands, holotype, female 4.8 mm (MNHN-IU- 2013 - 15873). H, Galathea leporis n. sp., Papua New Guinea, male 4.3 mm (MNHN-IU- 2013 - 370). I, Galathea longioculata n. sp., Vanuatu, holotype, female 4.8 mm (MNHN- IU- 2013 - 15979).