Lauriea simulata, 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 : 150-152

Lauriea simulata n. sp.

( Figs 5 , 8 B, 9B)

Material examined. Holotype: Vanuatu. SANTO. Stn FR4-F22, 15°34.5'S, 167°13.6'E, 3–24 m, 12 September 2006: 1 ov. F 2.7 mm (MNHN-IU-2010-5290).

Paratypes: Philippines. Panglao Island, Napaling. PANGLAO, R30, 9°37.1'N, 123°46.1'E, 15–37 m, 8 June 2004: 1 F 2.0 mm, in gorgonians ( NTOU).—Panglao Island, Front of PTA Compound. PANGLAO. Stn L41, 9°31.3'N, 123°41.2'E, 90–100 m, 1 July 2004: 1 M 2.5 mm ( NTOU).

Vanuatu. SANTO. Stn EP1, 15°32.5'S, 167°09.0'E, 46–47 m, 10 September 2006: 1 M 1.4 mm (MNHN-IU- 2010-5279).—Stn DB8, 15°34.6'S, 167°13.8'E, 12 m, 12 September 2006: 2 M 1.9–2.3 mm (MNHN-IU-2010- 5267, MNHN-IU-2010-5294).—Stn FR4-F22, 15°34.5'S, 167°13.6'E, 3–24 m, 12 September 2006: 1 M 2.8 mm (MNHN-IU-2010-5271).—Stn DB12, 15°36.6'S, 167°10.1'E, 10–18 m, 13 September 2006: 2 F 2.8 mm (MNHN- IU-2010-5272, MNHN-IU-2010-5344).—Stn DB20, 15°30.5'S; 167°01.4'E, 20–25 m, 15 September 2006: 1 ov. F 1.8 mm (MNHN-IU-2010-5289).—Stn DB29, 15°38.9'S, 167°05.1'E, 15 m, 17 September 2006: 2 M 1.8–1.9 mm (MNHN-IU-2010-5297, MNHN-IU-2010-5298), 3 ov. F 2.0– 2.3 mm.—Stn ED16, 15°35.3'S, 167°07.4'E, 5–7 m, 17 September 2006: 1 M 1.1 mm (MNHN-IU-2010-5274).—Stn DB33, 15°34.7'S, 167°13.8'E, 14–25 m, 18 September 2006: 2 M 1.2–1.7 mm (MNHN-IU-2010-5277).—Stn DB46, 15°28.8'S, 167°15.2'E, 2–3 m, 20 September 2006: 1 M 2.5 mm (MNHN-IU-2010-5270), 1 ov. F 2.4 mm (MNHN-IU-2010-5269).—Stn DB48, 15°38.7'S, 167°5.2'E, 10–17 m, 21 September 2006: 1 ov. F 2.0 mm (MNHN-IU-2010-5284).—Stn DB53, 15°28.8'S, 167°15.2'E, 5 m, 22 September 2006: 4 M 1.1–1.3 mm (MNHN-IU-2010-5265, MNHN-IU-2010-5278, MNHN-IU-2010-5293), 1 ov. F 3.1 mm (MNHN-IU-2010-5266).—Stn DB65, 15°25.8'S, 167°13.0'E, 13 m, 26 September 2006: 1 M 1.4 mm, 1 ov. F 2.3 mm (MNHN-IU-2010-5281).—Stn DB67, 15°22.9'S, 167°13.1'E, 7 m, 26 September 2006: 1 F 2.2 mm (MNHN-IU-2010-5280).—Stn DB75, 15°22.9'S, 167°11.9'E, 20 m, 28 September 2006: 1 M 1.5 mm (MNHN-IU-2010-5275), 1 F 2.1 mm (MNHN-IU-2010-5296).—Stn ZB6, 15°36.8'S, 167°01.3'E, 30 m, 28 September 2006: 1 M 1.5 mm, 1 ov. F 2.0 mm, 2 F 1.3–1.6 mm (MNHN-IU-2010- 5295).—Stn DB80, 15°37.1'S, 167°07.5'E, 18 m, 0 2 October 2006: 1 ov. F 2.5 mm (MNHN-IU-2010-5288).—Stn AT56, 15°36.1'S, 167°01.3'E, 98–105 m, 2 October 2006: 1 M 2.7 mm (MNHN-IU-2010-5282).—Stn FB56, 15°35.2'S, 167°02.1'E, 3–18 m, 0 7 October 2006: 1 M 1.5 mm (MNHN-IU-2010-5286).—Stn FB64, 15°35.4'S, 166°59.2'E, intertidal, 10 October 2006: 1 ov. F 2.2 mm (MNHN-IU-2010-5276).—Stn FB68, 15°35.4'S, 166°59.7'E, 11 m, 11 October 2006: 1 ov. F 2.2 mm (MNHN-IU-2010-5285).—Stn EP30, 15°37.6'S, 167°05.4'E, 103–120 m, 12 October 2006: 1 M 2.0 mm (MNHN-IU-2010-5287).—Stn FB83, 15°32.6'S, 167°17.4'E, 8–20 m, 15 October 2006: 1 F 2.0 mm (MNHN-IU-2010-5268).

New Caledonia. Vauban. Stn DW16, 22°20.7'S, 166°37.9'E, 30 m, 22 May 1984: 1 M 3.6 mm, 1 ov. F 3.1 mm (MNHN-IU-2010-5283).

New Caledonia. Lifou Island. LIFOU. Stn1448, 20°45.8' S, 167°01.65' E, 20 m, 17 November 2000: 1 M 1.8 mm (MNHN-IU-2010-5273).

Etymology. From the Latin, simulatus, imitate, in reference to the similarity between the new species and L. gardineri .

Description. Carapace: 1.0–1.3 times longer than wide, dorsal surface covered with long and short setae arising from numerous short and slightly prominent transverse ridges; small spines scattered on dorsal surface, 2 largest spines on epigastric region; no spine on transverse ridge anterior to posterior margin. Cervical groove indistinct. Lateral margins convex, with 7 small but distinct spines on each side, last spine very small, sometimes absent or located 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 lateral teeth, dorsal surface slightly concave, with a few long setae; length (measured from the tip to level of orbital margin) 0.4–0.5 times carapace length, and 0.8 times width (measured at level of orbital margin); tip of rostral spine and distalmost lateral teeth with straight lateral margins.

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

Sternum: sternite 3 with anterior margin somewhat produced medially, 2.8 times wider than long; sternite 4 twice as wide as sternite 3, and 3.2 times wider than long.

Eyes: orbit not laterally produced, unarmed. Eyestalks short, 1.4 times longer than wide, clearly exceeding antennal peduncle, proximally somewhat wider, distally with long setae directly proximal to cornea; cornea not swollen, length slightly less than half that 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 spine exceeding article 2; article 2 with distomesial spine nearly reaching end of peduncle, and distolateral spine 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 or 24 denticles. Merus with 2 subequal spines on flexor margin. Carpus with small distal spine on flexor margin.

P1: 3.0–3.2 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 as long as carapace; spines on dorsal and mesial sides, mesial spines larger, distal ones prominent. Carpus 1.3–1.5 times longer than wide, equally wide as propodus, and 0.5–0.6 length of merus; some scattered small spines on dorsal side, row of strong spines along mesial margin, some small spines on ventral side. Palm 1.4–1.6 times as long as wide; dorsal surface unarmed, with some long 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 0.7–0.9 palm length, not gaping and tips crossing when closed; terminating in sharp curved spine; dorsal surface unarmed; movable finger unarmed on mesial margin.

P2–4: P2 1.5–1.8 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, some well-developed spines on flexor margin, 0–2 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 0.8 times carapace length, 3.5–3.7 times longer than wide, and 2.0–2.1 times longer than propodus. Carpi with small spines (2 or 3 on P2, 0–2 on P3–4) on extensor margin. Propodi with row of small proximal spines (2 or 3 on P2, 0 or 1 on P3–4) along extensor margin and 4- or 5 movable slender spines on flexor margin, including 2 terminal spines; P2 propodus 3.2–3.5 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 whitish, with yellow spots circled by brown at base of rostrum, and at each side of anterolateral, mesogastric and anterior branchial areas; 2 additional spots on abdominal somite 1; setae brownish and whitish. P1–4 whitish and browinsh marbled, some yellow spots circled by brown on P1 merus and carpus; setae whitish.

Remarks. Lauriea simulata is closely related to L. gardineri from the western Indian Ocean (see the differences under the Remarks of L. gardineri ).

Distribution. Philippines, Vanuatu and New Caledonia, from intertidal to 120 m.

Figures

FIGURE 5. Lauriea simulata n. sp., holotype, ovigerous female, 2.7 mm, Vanuatu, SANTO, Stn FR 4 - F 22 (MNHN-IU- 2010 - 5290). 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, B, E – H = 1 mm; C – D = 0.7 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.