Leiogalathea anchises, 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 : 218-220

Leiogalathea anchises n. sp.

( Figs. 5 , 10E )

Type material. Holotype: Solomon Islands. SALOMON 1 Stn CP 1833, 10°12'S, 161°19'E, 367–533 m, 0 5 October 2001: F 6.4 mm (MNHN-IU-2014-13786).

Paratypes: Solomon Islands. SALOMON 1 Stn CP 1833, 10°12'S, 161°19'E, 367–533 m, 5 October 2001: 1 ov. F, 7.2 mm (MNHN-IU-2014-13767) .

Papua New Guinea. MADEEP Stn DW4287 , 09°12'S, 153°56'E, 340–375 m, 30 April 2014: 1 F 4.3 mm (MNHN-IU-2014-13791).—Stn DW4290 , 09°13'S, 153°54'E, 593– 593 m, 30 April 2014: 1 M 3.3 mm, 1 ov. F 6.0 mm (MNHN-IU-2016-5798).—Stn DW4292 , 09°14'S, 153°52'E, 530– 530 m, 30 April 2014: 1 M 7.4 mm (MNHN-IU-2015-350).—Stn DW4293 , 09°12'S, 153°57'E, 630–670 m, 30 April 2014: 1 M 5.3 mm, 1 ov. F 7.8 mm, 1 F 4.3 mm (MNHN-IU-2015-496) .

Etymology. From the name Anchises, Aeneas ’s father, and a symbol of Aeneas ’s Trojan heritage in the Aeneid. The name is considered a substantive in apposition.

Description. Carapace: 1.3 × as long as broad. Mid-transverse ridge usually interrupted, preceded by discernible cervical groove, followed by 6 medially interrupted transverse ridges. Lateral margins slightly convex, with 5 spines: first spine anterolateral, well-developed; spine on hepatic margin, smaller than first spine; 2 spines on anterior branchial margin; and 1 small spine on posterior branchial margin. Rostrum horizontal, dorsally flattish or slightly concave, 1.2–1.3 × as long as broad, length and breadth 0.3 × that of carapace; lateral margin with 5–8 small teeth decreasing in size distally.

Sternum: Sternite 3 somewhat quadrangular, 1.8–2.0 × as wide as long, anterior margin anterolaterally produced, with minute shallow median notch flanked by 2 low lobes. Sternite 4 broadly contiguous to sternite 3; surface depressed in midline, smooth; greatest width 3.1 × that of sternite 3, almost twice as wide as long.

Abdomen: Tergites 2–3 each with 2 elevated transverse ridges, tergites 4–5 with 1 transverse ridge, terguite 6 smooth; tergite 6 with transverse posteromedian margin.

Eye: Ocular peduncle as broad as long or slightly longer than broad; cornea subglobular, maximum corneal diameter 0.7 × rostrum width, as wide as eyestalk.

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

Antenna: Article 1 with strong distomesial spine nearly reaching end of article 2; article 2 with strong distomesial spine, longer than distolateral spine and 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 well-developed spine; extensor margin unarmed; crista dentata finely denticulate; merus having flexor margin with strong median spine, extensor margin with strong distal spine.

P1: 2.4 (males), 1.4–1.8 (females) × carapace length, with numerous short scale-like striae, densely covered by uniramous stiff long setae on merus to dactylus. Merus 0.5 × shorter than carapace, 1.6 × as long as carpus, with strong mesial and distal spines, and scattered dorsal spines. Carpus 0.8 as long as palm, 1.5 × as long as broad, dorsal surface with scattered spines, mesial margin with 1 strong spine, lateral margin with 2 small spines. Palm 1.6 × as long as broad, armed with spines in irregular longitudinal rows along mesial and lateral margins, dorsal surface unarmed. Fingers as long as palm; fixed finger with some proximal lateral spines; movable finger with 1 well-developed proximal spine mesially.

P2–4: Stout, somewhat compressed laterally, with short setiferous striae on dorsal surface, sparsely with long and thick setae on ischium to dactylus. Meri successively shorter posteriorly (P3 merus 0.9 × length of P2 merus, P4 merus 0.9 × length of P3 merus). P2 merus 0.5 × carapace length, 3.8 × as long as broad, 1.2 × as long as P2 propodus; P3 merus 3.2 × as long as broad, 1.1 × as long as P3 propodus; P4 merus 3.1 × as long as broad, as long as P4 propodus; extensor margins with a row of 7–9 proximally diminishing spines on P2–3; 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, 2 spines on P3, unarmed on P4; lateral side smooth; flexor margin unarmed. Propodi 4.5–5 × as long as broad on P2–4, flexor margin with 4 or 5 movable spinules. Dactyli 0.6–0.7 × length of propodi; distal claw short, moderately curved; flexor margin nearly straight, with 6 or 7 small teeth along entire margin 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. Solomon Islands and Papua New Guinea, from 340 to 670 m.

Remarks. Leiogalathea anchises belongs to the group of species having a hepatic marginal spine. The closest relative is L. creusa from French Polynesia (see below under the Remarks of that species).

Figures

FIGURE 5. Leiogalathea anchises n. sp., holotype, F 6.4 mm, Solomon Islands (MNHN-IU-2014-13786). 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, left 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.