Galathea celiae, 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 : 74-77

Galathea celiae n. sp.

( Figs 21 , 116 C)

Material examined. Holotype: Red Sea. AQ117, Gulf of Aqaba, Marine Science Station, 25 m, 21 July 1995: M 3.2 mm ( SMF).

Paratypes: Red Sea. Gulf of Aqaba, Marine Science Station. AQ94, 25 m, 17 July 1995: 1 M 1.7 mm ( SMF).—AQ98, 44 m, 18 July 1995: 4 M 2.0– 3.1 mm, 2 ov. F 2.5–3.2 mm ( SMF).—AQ117, 25 m, 21 July 1995: 3 M 2.0– 3.3 mm, 1 ov. F 3.3 mm, 1 F 2.5 mm ( SMF).—AQ119, 25 m, 21 July 1995: 2 M 2.7–3.3 mm, 1 ov. F 3.5 mm ( SMF). Sudan, Al Bahr al Ahmar. Sanganeb, SAN32, 40 m, 2 April 1991: 1 ov. F 3.2 mm ( SMF).—SAN113, 30 m, 27 September 1992: 1 M 2.3 mm, 1 F 2.6 mm ( SMF).—SAN147, 35 m, 30 September 1992: 1 M 2.1 mm, 1 F 2.0 mm ( SMF).—SAN148, 22 m, 3 October 1992: 1 F 2.4 mm ( SMF). Al Maqunah, 28°26.134'N, 34°45.478'E, 0–5 m, 13 April 2011: 1 ov. F 3.0 mm ( SMF). Farasan Island, 16°37.123'N, 41°56.038'E, 0–5 m, 27 February 2012: 1 M 3.2 mm, 2 ov. F 4.0– 4.2 mm ( SMF). Djibouti. Moucha Island, Bay of Ghoubbet, 11.51°N, 42.6725°E, 5–23 m, 30 September 2012: 6 M 1.7–2.6 mm, 5 ov. F 1.9–2.8 mm, 8 F 1.5–2.3 mm (UF32859); 1 M 2.8 mm (UF32860).

Red Sea. AQ117, holotype, M 3.2 mm

Etymology. This species is dedicated to Celia Schunter of the Centre d’Estudis Avançats de Blanes (CEAB- CSIC), for her support to marine research.

Description. Carapace: As long as broad; transverse ridges with dense very short setae, without long plumose setae; cervical groove laterally bifurcated. Gastric region with 5 transverse ridges: 1 epigastric ridge uninterrupted or medially interrupted, medially convex, without epigastric spines; 1 protogastric uninterrupted ridge, without parahepatic spines; 1 mesogastric ridge uninterrupted and extending laterally to anteriormost of branchial marginal spines; 2 metagastric ridges, anterior uninterrupted and not continuing laterally to anteriorbranchial ridges, posterior short. One small hepatic spine, at level between first and second lateral spines. Anterior branchial region with distinct ridges. Mid-transverse ridge uninterrupted, preceded by shallow cervical groove. Posterior branchial region with 2 transverse uninterrupted ridges. Lateral margins slightly convex, with 6 spines: 1 spine in front of and 5 spines behind anterior cervical groove; first anterolateral, well-developed, at same level of lateral limit of orbit, 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 1.5 as long as broad, length 0.6–0.7 postorbital carapace length and breadth 0.4 that of carapace; distance between distalmost lateral incisions 0.25 distance between proximalmost lateral incisions; dorsal surface 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: 1.1 times as long as broad, lateral extremities gently divergent posteriorly.

Abdomen: Somites 2–5 smooth, each anterior ridge slightly more elevated than posterior ridge; somite 6 with posteromedian margin straight. Males with G1 and G2.

Eyes: Ocular peduncles 1.3 times longer than broad, maximum corneal diameter 0.8 rostrum width.

Antennule: Article 1 with 3 well-developed distal spines, distodorsal larger, distomesial spine smaller. Ultimate article with tuft of fine setae on distodorsal margin.

Antenna: Article 1 with ventral distomesial spine reaching distal margin of article 2. Article 2 with 2 subequal distal spines, reaching midlength of article 3. Article 3 with distomesial spine; article 4 unarmed.

Mxp3: Ischium unarmed on flexor and extensor distal margins; crista dentata with 20–22 denticles. Merus shorter than ischium; flexor margin with 2 subequal well-developed spines; extensor margin unarmed. Carpus unarmed.

P1: 2.6–2.9 times carapace length, covered with finely setiferous scales, with scattered long setae. Merus as long as carapace, 1.8 times as long as carpus, with spines arranged roughly in rows, dorsomesial spines stronger; distal spines prominent. Carpus 0.8 length of palm, 1.4 times as long as broad; dorsal and lateral surfaces with some spines; mesial margin with 3 or 4 spines (distal second strong). Palm 1.7–1.8 times longer than broad, lateral and mesial margins slightly convex; spines arranged roughly in dorsolateral and dorsomesial rows, dorsal side unarmed; dorsolateral row continuing along proximal half of fixed finger. Fingers slightly longer than palm, each finger distally with two rows of teeth, spooned; movable finger with 1 or 2 proximal spines.

P2–4: moderately slender, with setose striae and sparse long plumose setae. P2 1.8 times carapace length. Meri successively shorter posteriorly (P3 merus 0.9 length of P3 merus, P4 merus 0.8 length of P2 merus); P2 merus 0.7 carapace length, 2.8 times as long as broad, 1.4 times longer than P2 propodus; P3 merus 2.9 times as long as broad, 1.4 times longer than P3 propodus; P4 merus 2.3 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, 4 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, 3 spines on P4. Carpi with 3 or 4 spines on extensor margin on P2–3, 2 or 3 spines on P4; lateral surface with 2 or 3 small spines or granules sub-paralleling extensor margin; flexor distal margin acute. P2–4 propodi 3.5–3.6 times as long as broad; extensor margin with 1 or 2 proximal spines; flexor margin with 4–6 slender movable spines. Dactyli 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 present on P1.

Coloration. Base color of carapace, abdomen and pereopods orange. Whitish narrow stripe before each transverse ridge on carapace and abdomen. Abdominal somites 3 and 4 each with one purple spot on each side. P1 with some yellowish spots on palm and fingers; tips of fingers whitish. P2–4 with some darker stripes.

Remarks. Galathea celiae n. sp. appears closest to G. spinimanus Borradaile 1900 from Lifou, New Caledonia, but is easily differentiated from the latter by the following features:

- The carapace has a hepatic spine in G. celiae , whereas this spine is absent in G. spinimanus .

- All gastric ridges are uninterrupted and continuing laterally to lateral margins of the carapace in G. spinimanus , whereas these ridges are laterally interrupted, except the mesogastric ridge, in G. celiae .

The genetic divergences between G. celiae and all other related species, for which genetic data are available, are always higher than 16.2% (COI) (no genetic data are available for G. spinimanus ) ( Tab. 1). Distribution. Red Sea, 0– 44 m.

Figures

FIGURE 21. Galathea celiae n. sp., holotype, male, 3.2 mm, Red Sea (SMF). 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 flapD, 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.

FIGURE 116. Dorsal view. A, Galathea boucheti n. sp., Madagascar, holotype, male 4.0 mm (MNHN-IU- 2013 - 8110). B, Galathea caesariata n. sp., Vanuatu, holotype, male 5.0 mm (MNHN-IU- 2013 - 15938). C, Galathea celiae n. sp., Red Sea, male 2.8 mm (UF 32860). D, Galathea consobrina De Man, 1902, Vanuatu, female 3.2 mm (MNHN-IU- 2013 - 8386). E, Galathea cymo n. sp., Vanuatu, ovigerous female 4.0 mm (MNHN-IU- 2013 - 13343). F, Galathea erythrina n. sp., Red Sea, holotype, female 1.3 mm (UF 36824). G, Galathea eulimene n. sp., Red Sea, Saudi Arabia, male 3.1 mm (UF 35961). H, Galathea galene n. sp., ovigerous female 5.4 mm (MNHN-IU- 2013 - 9878). I, Galathea gladiola n. sp., Vanuatu, holotype, female 4.5 mm (MNHN-IU- 2013 - 8436).