Lauriea adusta, Macpherson, Enrique & Robainas-Barcia, Aymee, 2013

Macpherson, Enrique & Robainas-Barcia, Aymee, 2013, A new genus and some new species of the genus Lauriea Baba, 1971 (Crustacea, Decapoda, Galatheidae) from the Pacific and Indian Oceans, using molecular and morphological characters, Zootaxa 3599 (2), pp. 136-160 : 139-141

Lauriea adusta n. sp.

( Figs 1 , 8 D, 9G–H)

Dubious records:

Galathea gardineri Tirmizi, 1966: 177 , fig. 2 (Red Sea, 29–55 m).— Lewinsohn, 1969: 112 (no record). Lauriea gardineri Lewinsohn, 1982: 299 , fig. 1 (Gulf of Aqaba (northern Red Sea), 3–81 m).— Kamezaki et al., 1988: 99, with color fig. (Okinawa).— Tirmizi & Javed, 1993: 23, figs 10–11 (western Indian Ocean off Somali Republic, Andaman Islands, 66–177 m).— Baba, 1994: 43, fig. 2 ( Madagascar, New Caledonia).— Kato & Okuno, 2001: 88, fig. (Hachijo Island, Japan, 25 m).

Material examined. Holotype: Philippines. Bohol Island, W of Baclayon. PANGLAO, Stn T6, 9°35.1'N, 123°51.2'E, 34-82 m, 2 June 2004: 1 M 2.5 mm, coarse muddy sand with large sponges ( NTOU).—Pamilacan Island. PANGLAO. Stn B19, 9°29.4'N, 123°56.0'E, 17 m, 21 June 2004: 1 ov. F 3.3 mm (MM).—Panglao Island, North of Doljo, PANGLAO. Stn B36, 9°35.9'N, 123°44.5'E, 24 m, 1 July 2004: 1 ov. F 2.5 mm ( NTOU).

Paratypes: Madagascar. MIRIKY. Stn DW3230, 13°25'S, 47°57'E, 71-158 m, 3 July 2009: 1 F 2.8 mm (MNHN-IU-2010-1116).

Philippines. Bohol Island, Baclayon Takot, PANGLAO. Stn B13, 9°37.1'N, 123°52.6'E, 3–5 m, 15 June 2004: 1 ov. F 3.1 mm, 1 F 2.6 mm ( NTOU).—Pamilacan Island. PANGLAO. Stn B19, 9°29.4'N, 123°56.0'E, 17 m, 21 June 2004: 1 ov. F 2.7 mm ( NTOU).—Panglao Island, Pontod Lagoon 1. PANGLAO. Stn B39, 9°32.8'N, 123°42.1'E, 17–25 m, 2 July 2004: 1 M 2.0 mm, 1 ov. F 2.4 mm ( NTOU).—Balicasag, PANGLAO. Stn T38, 9°32.3'N, 123°42.3'E, 80–140 m, 4 July 2004: 1 M 2.3 mm, 1 F 2.7 mm, in sponges ( NTOU).

Vanuatu. SANTO. Stn DB8, 15°34.6'S, 167°13.8'E, 12 m, 12 September 2006: 1 F 2.8 mm (MNHN-IU-2010- 5261).—Stn FB43, 15°28.4'S, 167°14.9'E, 19 m, 30 September 2006: 1 M 2.1 mm (MNHN-IU-2010-5260).

Etymology. From the Latin, adustus, brownish, in reference to the colouration of the new species.

Description. Carapace: as long as or slightly longer than wide, dorsal surface covered with long and short setae arising from numerous short and slightly elevated ridges; small spines scattered on dorsal surface, 2 largest spines on epigastric region, transverse ridge directly anterior to posterior margin with several small spines. Cervical groove indistinct. Lateral margins convex, with 6 or 7 small but distinct spines on each side, last spine sometimes absent or mesial to lateral margin; first (anterolateral) small, lateral to lateral limit of orbit, remainder more or less distantly separated from one another; 1 small spine mesial to anterolateral spine. Rostrum sharply triangular, with 4 moderately incised teeth, dorsal surface nearly flat, with a few long setae; length (measured from the tip to level of orbital margin) 0.4 times carapace length, and slightly greater than carapace width (measured at level of orbital margin); rostral spine and pair of distalmost lateral teeth with convex margins.

Abdomen: somites with thick long coarse unirramous setae. Somites 2–4 each 2 transverse setiferous ridges each preceded by groove.

Sternum: sternite 3 with anterior margin produced, medially notched, ca. 3.5 times wider than long; breadth of sternite 4 twice that of sternite 3, and ca. 4.0 times wider than long.

Eyes: orbit not laterally produced, unarmed. Eyestalks short, 1.6–1.8 times longer than wide, reaching end of antennal peduncle, proximally somewhat wider, distally with long setae directly proximal to cornea; cornea length slightly less than that half of remaining eyestalk.

Antennule: article 1 with 3 distal spines: distomesial slender, distolateral well developed, dorsolateral larger than distolateral; 2 slender terminal segments, ultimate segment with tuft of pronounced setae on extensor distal margin.

Antenna: article 1 with strong ventromesial process ending in acute spine overreaching end of article 2; article 2 with distomesial and distolateral spines reaching end of article 3, additional spine on mesial margin; article 3 unarmed or with minute distomesial spine.

Mxp3: ischium slightly longer than merus when measured in lateral midline, flexor margin with small distal spine, mesial ridge with 23–25 denticles. Merus with 2 subequal spines on flexor margin. Carpus with small distal spine on flexor margin.

P1: ca. 2.5 times carapace length; setose dorsally, scarcely setose or nearly glabrous ventrally; plumose and non-plumose long setae, partly coarse, arising from numerous short striae. Merus 0.8–0.9 times shorter than carapace, dorsal and mesial sides with row of spines, mesial spines larger, distal ones prominent, lateral margin with several distal spines. Carpus as long as wide, equally wide as propodus, and 0.4–0.5 length of merus; scattered small spines on dorsal side, row of strong spines along mesial margin, small spines on ventral side. Palm 1.3–1.5 times as long as wide; dorsal surface unarmed, with some long plumose and non plumose setae arising from numerous short striae, mesial margin with row of several spines, lateral margin with row of spines continued on to fixed finger. Fingers as long as or slightly longer than palm, not gaping and tips crossing when closed; terminating in sharp curved spine; dorsal surface unarmed; movable finger unarmed on mesial margin.

P2–4: P2 about 1.8 times carapace length, very setose on margins, with long plumose and non-plumose setae. P2–4 meri posteriorly diminishing in size, extensor margin rounded, with row of proximally diminishing spines, well-developed spines on flexor margin, 0–3 small spines on lateral side, and 1 extra spine on terminal margin close to distal flexor marginal spine, lateral side with some long setae arising from numerous short striae; P2 merus 0.9 times carapace length, 3.7–3.9 times longer than wide, and twice longer than propodus. Carpi with small spines (5 or 6 on P2, 0–3 on P3–4) on extensor margin. Propodi with row of small proximal spines (3 or 4 on P2, 0–2 on P3–4) along extensor margin and 4 or 5 movable slender spines on flexor margin, terminal paired; P2 propodus ca. 4.0 times longer than wide, and more than 1.8 times dactylus length. Dactyli sharply biunguiculate, terminal claw strongest.

Colour. Ground colour of carapace and abdomen brownish or whitish, without coloured spots. P1–4 brownish or whitish, without coloured bands. Setae whitish and brownish. The colour figures of Kamezaki et al. (1988) and Kato & Okuno (2001) are quite similar to the present material, although additional study of these specimens are necessary to confirm their identity.

Remarks. Lauriea adusta n. sp. is closely related to L. punctata n. sp. from the Philippines, Papua, Australia (Queensland), Vanuatu and New Caledonia. Their relationships are discussed under the Remarks of L. punctata (see below).

The intraspecific molecular divergences are wider than in all other species of Lauriea (3.1–5.2% in COI). The specimen from Madagascar diverges clearly between specimens from Philippines-Vanuatu (5.2% in COI) suggesting that they might belong to a different species. However, no clear morphological differences have been found and the colour pattern is only available for the Panglao specimens. Additional specimens from Madagascar should confirm their taxonomic position.

Distribution. Madagascar, Philippines and Vanuatu, at 3– 158 m.

Figures

FIGURE 1. Lauriea adusta n. sp., holotype, ovigerous female, 3.3 mm, Philippines, PANGLAO, Stn B 19 (NTUO). A, carapace and abdomen, dorsal view; B, sternal plastron, sternites 3 and 4; C, left cephalic region, showing antennular and antennal peduncles, ventral view; D, 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 8. Rostrum and anterior portion of carapace, dorsal view. A, Lauriea gardineri Laurie, 1926, ovigerous female, 2.4 mm, Madagascar, ATIMOVATAE, Stn DW 3605, male, 2.4 mm. B, Lauriea simulata, New Caledonia, LIFOU, Stn 1448, male, 1.8 mm. C, Lauriea punctata, Vanuatu, SANTO, Stn AT 85, male, 2.6 mm. D, Lauriea adusta, Philippines, PANGLAO, Stn B 39, male, 2.0 mm. E, Lauriea teresae, French Polynesia, Moorea Island, male, 1.8 mm. F, Triodonthea setosa, New Caledonia, SMIB 5, Stn DW 100, ovigerous female, 4.8 mm. Scale, 0.5 mm.