Leiogalathea camilla, Rodríguez-Flores & Macpherson & Machordom, 2019

Rodríguez-Flores, Paula C., Macpherson, Enrique & Machordom, Annie, 2019, Revision of the squat lobsters of the genus Leiogalathea Baba, 1969 (Crustacea, Decapoda, Munidopsidae) with the description of 15 new species, Zootaxa 4560 (2), pp. 201-256 : 223-225

Leiogalathea camilla n. sp.

( Figs. 7 , 10G )

Type material. Holotype: New Caledonia, BATHUS 3 Stn DW817 , 23°42'S, 168°15'E, 405–410 m, 29 November 1993: M 3.0 mm (MNHN-IU-2014-13728).

Paratypes: New Caledonia. BERYX 11 Stn CP 51, 23°45'S, 168°17'E, 390–400 m, 21 October 1992: 1 ov. F 3.0 mm (MNHN-IU-2014-13781) .

New Caledonia. BATHUS 3 Stn DW807 , 23°40'S, 167°59'E, 420–438 m, 27 November 1993: 1 M 5.1 mm (MNHN-IU-2014-13727).— Stn CP 815, 23°47'S, 168°17'E, 460–470 m, 28 November 1993: 1 M 3.4 mm (MNHN-IU-2014-13722).—Stn DW817 , 23°42'S, 168°15'E, 405–410 m, 28 November 1993: 1 M 3.0 mm, 1 ov. F 2.2 mm (MNHN-IU-2014-13724) .

New Caledonia. NORFOLK 1 Stn DW1704 , 23°47'S, 168°17'E, 400–420 m 25 June 2001: 1 ov. F, 3.0 mm (MNHN-IU-2014-13788), 2 ov. F, 2.7–3.2 mm (MNHN-IU-2014-13787).— Stn CP 1706, 23°43'S, 168°16'E, 383– 394 m, 25 June 2001: 1 ov. F 3.0 mm (MNHN-IU-2014-13777) .

New Caledonia. NORFOLK 2 Stn CP 2048, 23°43.82'S, 168°16.24'E, 380–389 m, 24 October 2003: 1 ov. F 2.3 mm (MNHN-IU-2014-13747).—Stn DW2109 , 23°47.46'S, 168°17.04'E, 422–495 m, 31 October 2003: 3 M 2–3.3 mm, 3 ov. F 2.1–3.0 mm, 1 F 2.3 mm (MNHN-IU-2014-13749) .

New Caledonia. KANACONO Stn DW4783 , 22°56'S, 167°48'E, 385–395 m, 29 August 2016: 1 ov. 2.8 mm (MNHN-IU-2017-3949) .

Etymology. From the name Camilla, the leader of the Volscians, a race of warrior maidens in the Aeneid. The name is considered a substantive in apposition.

Description. Carapace: 1.1–1.3 × as long as broad. Mid-transverse ridge usually medially interrupted, preceded by shallow cervical groove, followed by 3–5 laterally interrupted transverse ridges. Lateral margins slightly convex and subparallel, with 2 spines: first spine anterolateral, usually well-developed; second spine small, located on anterior branchial margin, hepatic margin and posterior branchial margins unarmed. Rostrum horizontal, slightly concave dorsally, 1.3–1.5 × as long as broad, length 0.3 × and breadth 0.2–0.3 × that of carapace; lateral margin with 4 or 5 distinct teeth.

Sternum: Sternite 3 moderately broad, 2.8–3.0 × as wide as long, anterolaterally produced, anterior margin straight and serrated. Sternite 4 anteriorly contiguous to sternite 3; surface depressed in midline, smooth; greatest width 3 × that of sternite 3, and 2.5 × as wide as long.

Abdomen: Tergite 2 with 2 elevated transverse ridges, tergites 3–4 each with transverse ridge, tergites 5–6 smooth; tergite 6 with transverse posteromedian margin.

Eye: Ocular peduncle short, longer than wide; cornea subglobular, maximum corneal diameter 0.8 × rostrum width, as wide as eyestalk.

Antennule: Article 1 with distomesial angle minutely serrated; lateral margin smooth.

Antenna: Article 1 with strong distomesial spine reaching end of article 2; article 2 with relatively short distolateral and distomesial spines, distomesial spine not reaching end of article 3; articles 3 and 4 unarmed.

Mxp3: Ischium as long as merus measured along extensor margin; flexor margin sharply ridged, terminating in small spine; extensor margin unarmed; crista dentata finely denticulate; merus having flexor margin with strong median spine, extensor margin with distal spine.

P1: 2.6–2.9 (males), 1.8–2.0 (females) × carapace length, with numerous short striae, and covered by uniramous long setae on merus to dactylus. Merus 0.7 length of carapace, 2.1 × as long as carpus, with strong mesial and distal spines, and several scattered dorsal spines. Carpus slightly shorter than palm, 1.6 × as long as broad, dorsal surface with scattered spines, mesial margin with strong spines, lateral margin unarmed. Palm 2.1 × as long as broad, armed with spines in irregular longitudinal rows along mesial and lateral margins, dorsal surface unarmed. Fingers 1.3 × as long as palm; fixed finger with 1 or 2 proximal spines along lateral margin; movable finger with well-developed proximal mesial spine.

P2–4: Stout, somewhat compressed laterally, with short setiferous striae on dorsal surface, with sparse long and thick setae on ischium to dactylus. Meri successively shorter posteriorly (P3 merus 0.9 × length of P2 merus, P4 merus 0.8 × length of P3 merus). P2 merus 0.6 × carapace length, 4.4 × as long as broad, 1.2 × as long as P2 propodus; P3 merus 4.2 × as long as broad, 1.2 × as long as P3 propodus; P4 merus 3.7 × as long as broad, as long as P4 propodus; extensor margins with row of 8 or 9 proximally diminishing spines on P2, with minute spines on P3, unarmed on P4; lateral surface unarmed; flexor margin with well-developed distal spine and several additional projecting scales. Carpi with 3 or 4 spines on extensor margin on P2–3, unarmed on P4, lateral side smooth; flexor margin with small distal spine. Propodi 5.9–6.1 × as long as broad on P2–4, flexor margin with 3–5 movable spinules. Dactyli 0.6–0.7 × length of propodi; distal claw short, moderately curved; flexor margin nearly straight, with 5 or 6 small teeth decreasing in size proximally, each with slender movable spinule, ultimate tooth equidistant between base of distal claw and penultimate tooth.

Colour in life. Unknown.

Genetic data. COI and 16S ( Table 2).

Distribution. New Caledonia, and adjacent waters, from 383 to 495 m.

Remarks. Leiogalathea camilla belongs to the group of species having the hepatic margin unarmed and is characterized by its small size and the strongly dentate rostrum margin. The closest relative is L. evander from French Polynesia, Philippines and Papua New Guinea (see below under the Remarks of that species).

Figures

FIGURE 7. Leiogalathea camilla n. sp., holotype, M 3.0 mm, New Caledonia (MNHN-IU-2014-13728). A, carapace and abdomen, dorsal view. B, sternites 3–4. C, cephalic region, showing antennular and antennal peduncles, ventral view. D, right Mxp3 ischium and merus, lateral view. E, left P1, dorsal view. F, right P2, lateral view. G, dactylus of right P2, lateral view. H, right P3, lateral view. I, right P4, lateral view. Scales: A, E, F, H, I = 1.0 mm; B–D, G = 0.5 mm.

FIGURE 10. Rostrum, and ocular peduncle, dorsal view. A, Leiogalathea achates n. sp., holotype, ov. F 3.6 mm (MNHN-IU- 2016-7125). B, L. aeneas n. sp., holotype, F 7.6 mm (SMF51246). C, L. agassizii (A. Milne Edwards, 1880), F 6.9 mm (SMF51247), Florida. D, L. amata n. sp., holotype, F 3.6 mm (MNHN-IU-2014-13779). E, L. anchises n. sp., holotype, F 6.4 mm (MNHN-IU-2014-13786). F, L. ascanius n. sp., holotype, M 5.9 mm (MNHN-IU-2013-17425). G, L. camilla n. sp., holotype, M 3.0 mm, (MNHN-IU-2014-13728). H, L. creusa n. sp., holotype, F 5.0 mm (MNHN-IU-2014-13716). I, L. dido n. sp., holotype, ov. F 9.8 mm (MNHN-IU-2013-17431). Scale = 1 mm.