Galathea pascualae, 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 : 212-215

Galathea pascualae n. sp.

( Fig. 76 )

Material examined. Holotype: New Caledonia. Lifou Island. LIFOU, Stn DW1648, 20°54.1'S, 167°03.3'E, 150–200 m, 7 November 2000: M 4.3 mm (MNHN-IU-2013-8078).

Paratypes: Indonesia. Kei Islands. KARUBAR, Stn DW1, 05°46'S, 132°10'E, 156–305 m, 22 October 1991: 1 M 4.6 mm (MNHN-IU-2013-8086).

Vanuatu. MUSORSTOM 8, Stn CP1017, 17°52.80'S, 168°26.20'E, 294–295 m, 27 September 1994: 1 M 3.8 mm (MNHN-IU-2013-8087).—Stn CP1071, 15°36.63'S, 167°16.34'E, 180–191 m, 4 October 1994: 1 M 4.5 mm, 1 ov. F 3.5 mm (MNHN-IU-2013-8062), 2 M 4.0–5.0 mm (MNHN-IU-2013-8084), 1 M 4.3 mm (MNHN-IU-2013- 8083).—Stn CP1086, 15°36.58'S, 167°16.32'W, 182–215 m, 5 October 1994: 1 M broken, 1 ov. F 4.0 mm (MNHN-IU-2013-8063). SANTO, Stn AT22, 15°32.3'S, 167°16.0'E, 180–227 m, 22 September 2006: 1 M 4.0 mm, 1 ov.F 4.9 mm (MNHN-IU-2013-8077).— Stn AT116, 15°32.9'S, 167°16.2'E, 153–196 m, 18 October 2006: 1 M 4.7 mm (MNHN-IU-2013-8082), 1 ov. F 4.5 mm (MNHN-IU-2013-8081).

New Caledonia. Chesterfield Islands. CHALCAL 84, Stn D35, 19°44.84'S, 158°25.83'E, 210 m, 21 July 1984: 1 ov. F 3.1 mm (MNHN-IU-2013-8058).—Stn CP10, 20°00.20'S, 158°46.60'E, 225 m, 22 July 1984: 2 ov. F 4.1–5.0 mm (MNHN-IU-2013-8085). CORAIL 2, Stn DW114, 19°25'S, 158°38'E, 217 m, 28 July 1988: 1 F 3.1 mm (MNHN-IU-2013-8059).

New Caledonia. BIOCAL, Stn CP108, 22°02.55'S, 167°05.68'E, 335 m, 9 September 1985: 3 ov. F 3.7–4.0 mm, 1 F 4.0 mm (MNHN-IU-2013-8070).—Stn CP110, 22°12.38'S, 167°06.43'E, 275–320 m, 9 September 1985: 1 ov. F 3.7 mm (MNHN-IU-2013-8071). MUSORSTOM 4, Stn DW149, 19°07.60'S, 163°22.7’E, 165 m, 14 September 1985: 1 M 5.5 mm (MNHN-IU-2013-8060).—Stn DW151, 19°07.00'S, 163°22.00'E, 200 m, 14 September 1985: 3 M 4.1–5.0 mm, 3 ov. F 4.2–4.6 mm (MNHN-IU-2013-8065).—Stn CP153, 19°04.20'S, 163°21.20'E, 235 m, 14 September 1985: 1 M 3.9 mm, 1 ov. F 3.8 mm (MNHN-IU-2013-8051).—Stn CC173, 19°02.50'S, 163°18.80'E, 250–290 m, 17 September 1985: 5 M 3.8–4.4 mm, 4 ov. F 3.5–3.8 mm, 1 F 4.0 mm (MNHN-IU-2013-8055).—Stn CC174, 19°00.30'S, 163°18.50'E, 365 m, 17 September 1985: 2 M 3.4–5.0 mm, 1 ov. F 4.9 mm (MNHN-IU-2013-8066).—Stn CP178, 18°56.30'S, 163°12.90'E, 520 m, 18 September 1985: 2 M 3.3–3.7 mm, 1 ov. F 3.5 mm (MNHN-IU-2013-8064).— Stn DW183, 19°01.80'S, 163°29.50'E, 280 m, 18 September 1985: 1 ov. F 3.4 mm (MNHN-IU-2013-8075). BATHUS 1, Stn CP667, 20°57'S, 165°34'E, 205–212 m, 14 March 1993: 2 M 4.0– 5.1 mm, 1 ov. F 4.4 mm (MNHN-IU-2013-8068).— Stn CP669, 20°57'S, 165°35'E, 255–280 m, 14 March 1993: 1 M 4.3 mm, 1 F 4.2 mm (MNHN-IU-2013-8072).— Stn CP710, 21°43'S, 166°36'E, 320–385 m, 19 March 1993: 6 M 3.7–5.6 mm, 1 F 5.0 mm (MNHN-IU-2013-8052).—Stn CP712, 21°44'S, 166°35'E, 210 m, 19 March 1993: 1 M 3.2 mm, 1 ov. F 3.2 mm (MNHN-IU-2013-8076). BATHUS 2, Stn DW717, 22°44'S, 167°16'E, 350–393 m, 11 May 1993: 2 ov. F 3.6–4.0 mm (MNHN-IU-2013-8061). BATHUS 3, Stn CP835, 23°02,29'S, 166°58,22'E, 350 m, 30 November 1993: 2 ov. F 3.5–4.6 mm (MNHN-IU-2013- 8074). BATHUS 4, Stn CP905, 19°02.45'S, 163°15.65'E, 294–296 m, 4 August 1994: 2 M 4.7–4.9 mm (MNHN- IU-2013-8069).—Stn CP906, 19°01.07'S, 163°14.51'E, 339–350 m, 0 4 August 1994: 4 M 4.5–5.2 mm, 2 ov. F 3.7–6.3 mm (MNHN-IU-2013-8054). NORFOLK 1, Stn CP1713, 23°22'S, 168°03'E, 204–210 m, 26 June 2001: 1 M 4.8 mm (MNHN-IU-2013-8073). South Reef. Stn 367bis, 22°37'S, 167°04'E, 105 m, November 1984: 1 M 3.4 mm (MNHN-IU-2013-13979). Lagon. Stn 540, 19°06.2'S, 163°15.8'E, 35–40 m, 6 March 1985: 1 M 3.7 mm (MNHN-IU-2013-13990). Lifou Island. LIFOU, Stn DW1648, 20°54.1'S, 167°03.3'E, 150–200 m, 7 November 2000: 2 M 3.8–5.2 mm (MNHN-IU-2013-8079).—Stn DW1649, 20°54.2'S, 167°01.1'E, 150–220 m, 8 November 2000: 2 M 4.4–4.6 mm, 2 ov. F 3.4–3.7 mm (MNHN-IU-2013-8067). —Stn DW1650, 20°54.15'S, 167°01.7'E, 120–250 m, 15 November 2000: 16 M 2.2–4.4 mm, 6 ov. F 3.2–3.3 mm (MNHN-IU-2013-8088, MNHN-IU-2013- 8080). Loyalty Islands. MUSORSTOM 6, Stn DW413, 20°40.10'S, 167°03.50'E, 463 m, 15 February 1989: 1 M 5.4 mm (MNHN-IU-2013-8053).—Stn CP419, 20°41.65'S, 167°03.70'E, 283 m, 16 February 1989: 1 M 4.0 mm (MNHN-IU-2013-8057), 1 M 4.4 mm (MNHN-IU-2013-8056).

Etymology. This species is dedicated to Marta Pascual of the Genetic Department, University of Barcelona, for her support to molecular crustacean research.

Description. Carapace: slightly longer than broad; transverse ridges with some moderately long non-plumose setae among short fine setae; cervical groove distinct, laterally bifurcated; most ridges on gastric region uninterrupted, with some scattered scale-like ridges; epigastric region with 8 or 9 spines; 1 or 2 small hepatic spines on each side, near anterolateral spine; 1 or 2 parahepatic spines lateral to anterior protogastric ridge ridge; anterior mesogastric ridge not extending laterally to anteriormost of branchial marginal spines; anterior metagastric ridge not extending laterally to anterior branchial ridges; mid-transverse ridge uninterrupted, preceded by shallow cervical groove, followed by 6 transverse ridges, 3 of them uninterrupted. Lateral margins slightly convex medially, with 7–9 spines: first anterolateral, well-developed, second very small but distinct, located at midlength between first spine and anteriormost spine of branchial margin, with small spine ventral to between first and second; 3 or 4 spines on anterior branchial margin, and 3 spines on posterior branchial margin. Small outer orbital spine; infraorbital margin with strong spine, and 1 or 2 minute spines. Rostrum triangular, 1.9–2.0 times as long as broad, length 0.6 that of, breadth 0.3–0.4 that of carapace; distance between distalmost lateral incisions 0.25 distance between proximalmost lateral incisions, dorsal surface slightly concave, nearly horizontal in lateral view, with some thick long plumose setae; lateral margin with 4 moderately incised sharp teeth.

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

Sternum: Slightly longer than broad, lateral limits divergent posteriorly.

Abdomen: Somites 2–3 each with 2 uninterrupted and 2 interrupted transverse ridges on tergite, anterior ridge more distinctly elevated than posterior ridge; somites 4–6 each with 2 medially interrupted ridges, sometimes anterior ridge of somite 4 uninterrupted; posteromedian margin of somite 6 straight. Males with G1 and G2.

Eyes: Ocular peduncles 1.5–1.7 times longer than broad, maximum corneal diameter 0.6 rostrum width.

Antennule: Article 1 with 3 spines; well-developed distodorsal and distolateral spines, distodorsal larger; distomesial spine clearly shorter than others; 2 small spines along lateral margin. Ultimate article moderately short, twice longer than broad, with a few short fine setae not in tuft on distodorsal margin.

Antenna: Article 1 with distomesial spine not reaching or reaching distal margin of article 2. Article 2 with 2 well-developed distal spines, distolateral spine reaching midlength of article 3, distomesial spine slightly shorter than distolateral. Article 3 with small distomesial and distolateral spine. Article 4 unarmed.

Mxp3: Basis with several denticles on mesial ridge, distalmost larger. Ischium with well-developed spine on flexor distal margin; crista dentata with 20–21 denticles. Merus as long as ischium; flexor margin with 1 strong spine at midlength, and 1 small distal spine, sometimes 1 additional spine between them; extensor margin unarmed. Carpus unarmed.

P1: 4.6–4.7 times carapace length, covered with finely setiferous scales, with scattered long thick plumose setae. Merus 1.8 times length of carapace, 2.0 times as long as carpus, with spines arranged roughly in rows, dorsomesial and ventromesial spines stronger; distal spines prominent. Carpus 0.9 length of palm, 3.3–3.6 times as long as broad; dorsal surface with small spines arranged roughly in 2 longitudinal rows; mesial spines slightly stronger than dorsal spines. Palm 3.3–3.4 times longer than broad, lateral and mesial margins with small spines arranged roughly in dorsolateral and dorsomesial rows, some small spines scattered on dorsal side. Fingers 0.9 length of palm, each finger distally with two rows of teeth, spooned; mesial margin of movable finger unarmed.

P2–4: Moderately long and slender, with setose striae and sparse long plumose setae. Meri successively shorter posteriorly (P3 merus 0.8 length of P2 merus, P4 merus 0.9 length of P3 merus); P2 merus 0.9 carapace length, 6.3 times as long as broad, 1.4 times longer than P2 propodus; P3 merus 5.0 times longer than broad, 1.2 times longer than P3 propodus; P4 merus 4.3 times as long as broad, 1.2 length of P4 propodus. Extensor margins of meri with row of 8 or 9 proximally diminishing spines; flexor margins distally ending in strong spine followed proximally by small spine and several tubercles or eminences. Carpi with 3–6 spines on extensor margin on P2–3, 1 or 2 spines on P4, distalmost smaller than distal second; lateral surface with acute granules sub-paralleling extensor margin on P2–4; flexor distal margin sometimes with small spine. Propodi subequal in length, 6 times as long as broad; extensor margin with 3–5 small proximal spines on P2, 0–4 on P3–4; flexor margin with 6 or 7 slender movable spine on P2–4. Dactyli subequal in length, distally ending in well-curved strong spine, length 0.7 that of propodi; flexor margin with 5 or 6 proximally diminishing teeth, terminal one prominent.

Epipods on P1.

Remarks. Galathea pascualae resembles G. pubipes n. sp. from New Caledonia (see below under Remarks for this species).

Distribution. Indonesia (Kei Islands), Vanuatu, New Caledonia, Loyalty and Chesterfield Islands, 35– 520 m.

Figures

FIGURE 76. Galathea pascualae n. sp., holotype, male, 4.3 mm, New Caledonia (MNHN-IU- 2013 - 8078). 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 mm; B – D = 0.5 mm.