Galathea parvula , 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: 209-212
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Galathea parvula n. sp.
Material examined. Holotype: Saudi Arabia, Yanbu, 24.4427 °N, 37.2477 'E, 3–22 m, 4 October 2013: ov F 2.9 mm (UF 38286).
Etymology. From the Latin parvulus, child, in reference to the small size of the species. Description. Carapace: Slightly longer than broad; transverse ridges with short setae, with scattered long nonplumose, iridescent setae; cervical groove distinct, laterally bifurcated. Gastric region with 5 transverse ridges: 1 epigastric ridge medially interrupted, with 2 spines; 1 protogastric ridge, uninterrupted (medially interrupted in one paratype), 1 parahepatic spine on each side between epigastric and protogastric ridges; 1 mesogastric ridge, scalelike, not continuing laterally with anteriormost branchial spines; 2 metagastric ridges, anterior ridge medially interrupted, not continuing laterally to anterior branchial ridges, posterior one short. Anterior branchial region with some ridges. Mid-transverse ridge uninterrupted, preceded by shallow cervical groove, followed by 4 ridges, 2 of them uninterrupted. 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 small, with spine ventral to between first and second spines; 2 spines on anterior branchial region, and 3 spines on posterior branchial margin. Lateral limit of orbit with small spine; infraorbital margin with strong spine. Rostrum narrowly triangular, 1.7 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 slightly concave; lateral margin with 4 deeply incised sharp teeth.
Pterygostomian flap rugose, unarmed, ridges with short setae, anterior margin blunty produced.
Sternum: As long as broad, lateral extremities gently divergent posteriorly.
Abdomen: Somite 2 with 2 transverse uninterrupted ridges; somite 3 with 1 anterior uninterrupted ridge and 1 scale-like ridge; somites 4-6 smooth; posteromedian margin of somite 6 straight. Males with G 1 and G 2.
Eyes: Ocular peduncles 1.5 times longer than broad, maximum corneal diameter 0.7 rostrum width.
Antennule: Article 1 with 3 well-developed distal spines, distodorsal larger than others. Ultimate article with a few short fine setae not in tuft on distodorsal margin.
Antenna: Article 1 with ventral distomesial spine exceeding distal margin of article 3. Article 2 with subequal distolateral and distomesial spines, reaching midlength of article 3. Article 3 with minute distomesial spine. Article 4 unarmed.
Mxp 3: Ischium with small spine on flexor distal margin, extensor margin ending in acute point; crista dentata with 22–25 denticles. Merus as long as ischium; flexor margin with 2 spines, proximal longer than distal; extensor margin with small distal spine. Carpus unarmed.
P 1: 2.5 –3.0 times carapace length, with some finely setiferous scales, and some scattered long setae; some setae iridescent. Merus 0.9–1.2 times length of carapace, 1.5 times as long as carpus, with spines arranged roughly in rows, dorsomesial spines stronger; distal spines prominent. Carpus 0.8 –1.0 length of palm, 2.0– 2.2 times longer than broad; dorsal surfaces with a few minute spines; mesial margin with 1 strong median spine and some additional smaller spines. Palm 2.4 times longer than broad, lateral and mesial margins subparallel; spines arranged roughly in dorsolateral and dorsomesial rows; dorsolateral row continuing along fixed finger; some scattered small dorsal spines. Fingers as long as palm, movable finger unarmed; each finger with two rows of teeth distally spooned.
P 2–4: Moderately long and slender, with setose striae and long setae; setae non-iridescent. P 2 1.8 times carapace length. Meri successively shorter posteriorly (P 3 merus 0.9 length of P 2 merus, P 4 merus 0.9 length of P 3 merus); P 2 merus 0.7 carapace length, 4.5 times as long as broad, 1.5 times longer than P 2 propodus; P 3 merus 3.5 times longer than broad, 1.3 times longer than P 2 propodus; P 4 merus 3.5 times as long as broad, slightly longer than P 4 propodus. Extensor margins of meri with row of 8 or 9 proximally diminishing spines on P 2 –3, 2 or 3 spines on P 4; flexor margins distally ending in strong spine followed proximally by several tubercles or eminences; lateral sides unarmed. Carpi with 3 or 4 spines on extensor margin; lateral surface with 2 or 3 granules subparalleling extensor margin on P 2–4; flexor margin blunty produced. Propodi 4.2–4.6 times as long as broad; extensor margin with 1 or 2 small proximal spines on P 2–4; flexor margin with 4 or 5 slender movable spines on P 2–4. Dactyli distally ending in well-curved strong spine, length 0.6–0.7 that of propodi; flexor margin with 5 proximally diminishing teeth, terminal one prominent.
Epipods on P 1–2.
Coloration. Base color of carapace and abdomen reddish. P 1 with transverse reddish and whitish stripes. P 2–4 with distal part of meri, carpi and propodi with darker red transverse ridges. Rostrum and eyes peduncle reddish.
- The lateral margin of the fixed finger of P 1 has a row of spine in the present new species, whereas this margin is unarmed in G. gnoma .
- The mesial margin of P 1 carpus has one strong median spine in the new species, that is absent in G. gnoma .
- The two spines on the flexor margin of Mxp 3 merus are subequal in G. gnoma , whereas the proximal is clearly longer than distal spine in the new species.
No genetic data are available for G. parvula .
Distribution. Red Sea, Saudi Arabia, 3– 22 m.
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