Galathea aculeata Haswell, 1882

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: 26-28

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Galathea aculeata Haswell, 1882


Galathea aculeata Haswell, 1882 

( Fig. 4View FIGURE 4)

Galathea aculeata Haswell, 1882 a: 761  (Holborn Island and Port Molle, Queensland, 36 m. — Haswell, 1882 b: 162.— Grant & McCulloch, 1906: 48, pl. 4, figs 4, 4a (Holborn Island and Port Molle, Queensland).

Dubious identifications

Galathea aculeata Henderson, 1888: 120  (off Manila and off Nukalofa, Tongatabu, 33 m).— Whitelegge, 1900: 190 (no record).— Tirmizi, 1966: 178, figs 3, 4A (Red Sea, 29–55 m).— McNeill, 1968: 33 (Great Barrier Reef, Lizard Island, 16–37 m).— Lewinsohn, 1969: 111 (no record).— Johnson, 1970: 4, fig. 1 a (Shoal west of Pulau Pawai, Singapore, 9 m).— Haig, 1973: 280 (off Double Island Point, Queensland, 31 m).— Haig, 1974: 447 (Western Australia).— Poupin, 1996: 19 (compilation of French Polynesia records).

Material examined. Type material (syntypes). Australia. Queensland, Port Molle, 20.33 °S, 148.85 °E, 36 m, Coll. W.A. Haswell: 1 F 4.3 mm (AM P 267), 1 F 3.6 mm, dry specimen (AM G 5657). Queensland, Holborn Island, Port Denison, 1 specimen, 1 dry specimen (glued to glass), 4.5 mm (AM P 41003View Materials).

Description. Carapace: Slightly longer than broad; cervical groove laterally bifurcated; ridges on gastric and anterior branchial regions scale-like or in concentric arcs; epigastric region with 2 submedian spines; 1 hepatic and 1 parahepatic spines, and 1 anterior branchial spines on each side. Mid-transverse ridge laterally interrupted, preceded by cervical groove, followed by 4 ridges, 2 of them uninterrupted. Lateral margins slightly convex medially, with 8 spines: 2 spines in front of and 6 spines behind anterior cervical groove; first anterolateral, second small, located at midlength between first spine and anterior cervical groove; 3 spines on anterior branchial margin, and 3 spines on posterior branchial margin, last smaller than others; additional spine ventral to between first and second lateral spine. External limit of orbit with small spine; infraorbital margin with 1 spine. Rostrum moderately elongate, triangular, 1.7 times as long as broad, 0.6 carapace length and breadth 0.4 that of carapace; distance between distalmost lateral incisions 0.3 distance between proximalmost lateral incisions; dorsal surface with short setiferous ridges; lateral margin with 4 deeply incised sharp teeth.

Pterygostomian flap unarmed.

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

Abdomen: Somites 2–3 each with 2 transverse ridges on tergite, with or without additional interrupted ridges between, anterior ridge more distinctly elevated than posterior ridge; tergite of somite 4 with anterior ridge only; somites 5 and 6 without ridges, posteromedian margin of somite 6 nearly transverse. No males examined.

Eyes: Ocular peduncles 1.5 times longer than broad, maximum corneal diameter 0.7 rostrum width.

Antennule: Article 1 with 3 well-developed spines, distodorsal larger; distomesial spine somewhat smaller and more slender than distolateral. Ultimate article with tuft of fine setae on distodorsal margin.

Antenna: Article 1 with distomesial spine exceeding distal margin of article 2. Article 2 with 2 well-developed distal spines. Articles 3 and 4 unarmed.

Mxp 3: lacking or not observable in syntypes examined.

P 1: 3.0 times carapace length, with sparse long plumose setae. Merus 1.0 times length of carapace, 1.9 times as long as carpus. Carpus 0.9 length of palm, 2.1 times as long as broad. Palm 2.1 times as long as broad, lateral and mesial margins slightly divergent; spines arranged in irregular rows, dorsolateral row of spines continued onto whole lateral margin of fixed finger. Fingers 1.1 times palm length; mesial margin of movable finger with 4 small proximal spines; each finger distally with 2 rows of teeth, spooned.

P 2–4: Moderately slender, with long sparse plumose setae. 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, 2.9 times as long as broad, 1.2 times longer than P 2 propodus; P 3 merus 2.9 times longer than broad, equally broad as P 4 merus, 1.1 times longer than P 3 propodus; P 4 merus 2.9 times as long as broad, 1.0 length of P 4 propodus. Propodi subequal in length, each about 4 times as long as broad; extensor margins each with 3–4 spines on proximal half in P 2 and P 3, with 1 proximal spine in P 4; flexor margins each with 6 or 7 slender movable spines. Dactyli subequal in length, 0.7 length of propodi; flexor margins each with 5 proximally diminishing teeth bearing minute robust setae.

Epipods on P 1–3.

Color. Unknown.

Remarks. Galathea aculeata  had been synonymized with G. subsquamata Stimpson, 1858  (cf. Baba et al. 2008). Both species belong to a group of species characterized by scale-like ridges on the gastric region, and the branchial region with dorsal spines. However, they are easily differentiable by the presence or absence of postcervical spines on the carapace (see Remarks of G. subsquamata  ). The existence of some new species belonging to this group also suggests that numerous records identified as G. aculeata  or G. subsquamata  need revision and probably belong to the closely related species (e.g., G. acerata  n. sp., G. polydora  n. sp.). Galathea aculeata  most closely resembles G. peitho  n. sp. from Japan to Australia (see Remarks of this species).

No molecular data is available from G. a c u l ea t a.

Distribution. Australia, Queensland, Holborn Island and Port Molle, 36 m. Other literature records under the name G. aculeata  need revision, as noted above.














Galathea aculeata Haswell, 1882

Macpherson, Enrique & Robainas-Barcia, Aymee 2015

Galathea aculeata

Poupin 1996: 19
Haig 1974: 447
Haig 1973: 280
Johnson 1970: 4
Lewinsohn 1969: 111
McNeill 1968: 33
Tirmizi 1966: 178
Whitelegge 1900: 190
Henderson 1888: 120

Galathea aculeata

Grant 1906: 48
Haswell 1882: 761
Haswell 1882: 162