Galathea furfurea, 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 : 119-121

Galathea furfurea n. sp.

( Fig. 39 )

Material examined. Holotype: New Caledonia. Touho, 20°47'S, 165°13'E, 20 m, 18 September 1993: M 3.3 mm (MNHN-IU-2013-13318).

Paratypes: New Caledonia. Touho, 20°47'S, 165°13'E, 20 m, 18 September 1993: 3 M 2.2–3.4 mm, 3 ov. F 2.4–3.0 mm (MNHN-IU-2013-13320); 1 ov. F 2.4 mm (MNHN-IU-2013-13319). New Caledonia. Lifou Island, LIFOU, Stn 1452, 20°54.6'S, 167°02.1'E, 2–25 m, 22 November 2000: 1 F 2.3 mm (MNHN-IU-2013-9766).—Stn 1469, 20°54.2'S, 167°00.4'E, 70–130 m, 22–23 November 2000: 3 M 2.9–3.8 mm (MNHN-IU-2013-13317).

South China Sea. Macclesfield Bank, Stn 63, 15°37'2"N, 114°28'42"E, 63 m, 3 May 1893: 1 M 3.4 mm ( NHMUK).

Etymology. From the Latin furfur, bran, scurf, in reference with the small scales on the carapace.

Description. Carapace: Slightly longer than broad; ridges with dense short setae, without long setae; cervical groove distinct, laterally bifurcated. Ridges on gastric, cardiac and branchial regions scale-like or in concentric arcs, with 4 epigastric spines, and 1 parahepatic spine on each side. Mid-transverse ridge interrupted, preceded by shallow cervical groove. Lateral margins slightly convex, 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 spine small, with spine ventral to between first and second spines; 2 spines on anterior branchial region, and 3 spines on posterior branchial margin, last small. Small spine between lateral limit of orbit and anterolateral spine; infraorbital margin with strong spine. Rostrum 1.6 as long as broad, length 0.6 carapace length and breadth 0.4 that of carapace; distance between distalmost lateral incisions 0.25 distance between proximalmost lateral incisions; dorsal surface concave medially, nearly horizontal in lateral view, with some short setae; 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: Somite 2 with 1 or 2 transverse uninterrupted ridges; somites 3–4 with anterior transverse ridge only; somites 5 and 6 smooth, posteromedian 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, distomesial spine slightly smaller. Ultimate article with a few short fine setae not in tuft on distodorsal margin.

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

Mxp3: Ischium with minute spine on flexor and extensor distal margins; crista dentata with 19–21 denticles. Merus shorter than ischium; flexor margin with 2 spines, proximal clearly longer than distal; extensor margin with small spine. Carpus unarmed.

P1: 2.9–3.0 times carapace length, covered with finely setiferous scales, with scattered long setae. Merus 0.9–1.1 times length of carapace, 1.2 times as long as carpus, with spines arranged roughly in rows, dorsomesial spines stronger; distal spines prominent. Carpus 0.8–0.9 length of palm, 1.8 times as long as broad; dorsal and lateral surfaces with some spines; mesial margin with some spines. Palm 1.5 times longer than broad, lateral and mesial margins subparallel; spines arranged roughly in dorsolateral and dorsomesial rows; dorsolateral spines continuing along proximal half of fixed finger. Fingers 0.7 length of palm, each finger with two rows of teeth distally spooned; movable finger unarmed.

P2–4: moderately slender, with setose striae and sparse long plumose setae. P2 1.9 times carapace length. Meri successively shorter posteriorly (P3 merus 0.8 length of P2 merus, P4 merus 0.9 length of P3 merus. P2 merus 0.7 carapace length, 3.5 times as long as broad, 1.4 times longer than P2 propodus; P3 merus 2.9 times as long as broad, 1.2 times longer than P3 propodus; P4 merus 3.0 times as long as broad, 1.1 times longer than P4 propodus. Extensor margin of P2–3 meri with row of 7 or 8 proximally diminishing spines, 1 or 2 spines on P4; ventral margins distally ending in strong spine followed proximally by 0–1 spines and several eminences; lateral sides unarmed on P2–3, with 2 spines on P4. Carpi with 3 or 4 spines on extensor margin on P2–3, 0–1 spines on P4; lateral surface with 3–5 spines or granules sub-paralleling extensor margin; flexor distal margin acute. Propodi 4.0–5.0 times as long as broad; extensor margin with 0–4 proximal spines on P2–4; flexor margin with 5 or 6 slender movable spines. Dactyli distally ending in well-curved strong spine, length 0.6–0.7 that of propodi; flexor margin with 4 proximally diminishing teeth, terminal one prominent.

Epipods present on P1.

Remarks. The new species resembles G. submagnifica Laurie, 1926 from the southwestern Indian Ocean and G. waiora n. sp. from French Polynesia (see Remarks for these species).

Distribution. New Caledonia, Macclesfield Bank, 2– 130 m.

Figures

FIGURE 39. Galathea furfurea n. sp., holotype, male, 3.3 mm, New Caledonia (MNHN-IU- 2013 - 13318). 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, left P 4, lateral view. Scale: A, E – H = 1 mm; B – D = 0.5 mm.