Leiogalathea paris, 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 : 242-243

Leiogalathea paris n. sp.

( Figs. 11F , 17 , 21E )

Leiogalathea laevirostris .— Baba 1991: 487 (in part, specimens from French Polynesia only).— Poupin 1996: 20, 21 (fig. h).

Type material. Holotype: French Polynesia. TARASOC Stn DW3441 , 16°43'S, 151°26'W, 350–360 m, 16 October 2009: ov. F 4.0 mm (MNHN-IU-2011-4471).

Paratypes: French Polynesia. MARARA Stn D 25, 16°07'S, 145°49'W, 398 m, 7 June 1990: 1 M 4.7 mm (MNHN-IU-2014-13773); 1 M 5.1 mm (MNHN-IU-2014-13774) .

Wallis and Futuna. MUSORSTOM 7 Stn DW582 , 13°10.5'S, 176°14.1' W, 360 m, 22 May 1992: 1 M 4.6 mm (MNHN-IU-2014-13715) .

New Caledonia. NORFOLK 2 Stn DW2024 , 23°27.92'S, 167°50.90'E, 370–371 m, 21 October 2003: 1 M 2.6 mm (MNHN-IU-2014-13748) .

Tonga. BORDAU 2 Stn DW1616 , 23°04.22'S, 175°54.09'W, 664–781 m, 17 June 2000: 1 F 4.5 mm (MNHN- IU-2014-13714) .

French Polynesia. TARASOC Stn DW3356 , 15°57'S, 147°08'W, 490 m, 1 October 2009: 1 F 4.0 mm (MNHN- IU-2011-3926).—Stn DW3357 , 15°57'S, 147°08'W, 480 m, 10 October 2009: 1 F 4.5 mm (MNHN-IU-2014- 13718).—Stn DW3359 , 15°57'S, 147°08'W, 462–980 m, 1 October 2009: 1 ov. F 4.3 mm (MNHN-IU-2011- 4333).—Stn DW3367 , 16°07'S, 146°22'W, 396–501 m, 3 October 2009: 1 M 5.0 mm (MNHN-IU-2014-13717).— Stn DW3369 , 16°08'S, 146°24'W, 412–520 m, 3 October 2009: 1 M 4.3 mm (MNHN-IU-2014-13704).—Stn DW3484 , 17°47'S, 149°23'W, 300–650 m, 23 October 2009: 1 M 5.2 mm (MNHN-IU-2014-13720) .

Chesterfield Islands. EBISCO Stn DW2537, 22°18'S, 159°29'E, 990– 990 m, 10 October 2005: 1 ov. F 4.2 mm (MNHN-IU-2014-13784).

New Caledonia. EXBODI Stn DW3922 , 18°33'S, 164°21'E, 525–560 m, 26 September 2011: 1 F 5.4 mm (MNHN-IU-2013-1727) .

Papua New Guinea. MADEEP Stn DW4314 , 09°48'S, 151°33'E, 278–420 m, 3 May 2014: 1 M 2.0 mm (MNHN-IU-2015-296) .

New Caledonia. KANADEEP Stn DW4921 , 21°39'S, 162°42'E, 800– 800 m, 1 September 2017 : 1 F 2.7 mm (MNHN-IU-2017-3535).— Stn DW4962 , 23°02'S, 159°28'E, 315–1260 m, 6 September 2017 : 1 F 2.6 mm (MNHN-IU-2017-3834), 1 ov. F 3.4 mm, 1 F 3.3 mm (MNHN-IU- 2017-2732).

Etymology. From the name Paris, a Trojan prince, son of Priam The name is considered a substantive in apposition.

Description. Carapace: 1.1–1.3 × as long as broad. Mid-transverse ridge usually medially interrupted, followed by rows of setae usually not situated on marked discernible ridges. Lateral margins straight and subparallel, with 1 anterolateral spine only; hepatic and branchial margins unarmed (rarely with a obsolescent spine on anterior branchial margin). Rostrum horizontal, dorsally flattish or slightly concave, 1.3–1.4 × as long as broad, length 0.3 × and breadth 0.2–0.3 × that of carapace; lateral margin with 4 or 5 rudimentary teeth, dorsal surface densely covered by long setae.

Sternum: Sternite 3 moderately broad, 2.8–3.0 × as wide as long, anterolaterally strongly produced, anterior margin serrated, straight, with a median shallow minute notch. Sternite 4 broadly contiguous to sternite 3; surface depressed in midline, smooth; greatest width 3 × that of sternite 3, 2.5 × as wide as long.

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

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

Antennule: Article 1 with distomesial angle usually armed with 1 small spine; lateral margin smooth.

Antenna: Article 1 with distomesial spine overreaching end of article 2; article 2 with distomesial and distolateral spines, distolateral stouter, both 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 well-developed spine; extensor margin unarmed; crista dentata finely denticulate; merus flexor margin with strong median spine and with or without distal spine, extensor margin with distal spine.

P1: 2.5–3.2 (males), 1.8–2.5 (females) × carapace length, with numerous short striae, and densely covered by uniramous short and 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 scattered dorsal spines. Carpus slightly shorter than palm, 1.6 × as long as broad, dorsal surface with scattered spines, mesial margin with 2 strong spines (distal smaller). Palm 2.1 × as long as broad, armed with spines in irregular longitudinal rows on mesial and lateral margins, dorsal surface unarmed. Fingers 1.3 × as long as palm; fixed finger unarmed; movable finger with proximal mesial spine.

P2–4: Stout, somewhat compressed laterally, with short setiferous striae on dorsal surface; with numerous long and thick setae on ischium to dactylus. Meri successively shorter posteriorly (P3 merus 0.8 × length of P2 merus, P4 merus 0.9 × length of P3 merus). P2 merus 0.7 × carapace length, 4.1 × as long as broad, 1.6 × as long as P2 propodus; P3 merus 4 × as long as broad, 1.5 × as long as P3 propodus; P4 merus 4 × as long as broad, 1.2 × as long as P4 propodus; extensor margins with row of 7–8 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 2–4 spines on extensor margin on P2–3, unarmed on P4, lateral side smooth; flexor margin with small distal spine. Propodi 4.0–4.8 × as long as broad on P2–4, flexor margin with 4 or 5 movable spinules. Dactyli 0.5–0.6 × length of propodi; distal claw short, moderately curved; flexor margin nearly straight, with 6 or 7 small teeth along the 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. Ground colour reddish, orange to pale. Carapace and anterior half of abdomen pale orange. P1 occasionally totally orange with orange red bands, tips of fingers whitish; P2–4 with orange or reddish bands.

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

Distribution. Polynesia, Papua New Guinea, Wallis and Futuna, New Caledonia and Chesterfield Island, from 396 to 1260 m.

Remarks. Leiogalathea paris belongs to the group of species having the hepatic margin of the carapace unarmed, the branchial margin with or without a spine, and the lateral margin of the rostrum armed with 4 or 5 rudimentary teeth. This species is morphologically very similar to L. juturna from Indonesia and Taiwan, from which it is differentiated by the absence of marked discernible ridges on branchial regions and the anterior branchial margin unarmed instead of bearing a distinct spine. Furthermore, the flexor margin of Mxp3 merus occasionally has a small distal spine in L. paris , instead of being consistently unarmed. The genetic divergences between them are on average 7.2% (COI) and 1.4% (16S) (see also below, under the Remarks of L. priam ).

Figures

FIGURE 11. Rostrum, and ocular peduncle, dorsal view. A, Leiogalathea evander n. sp., holotype, M 3.9 mm (MNHN-IU- 2015-820). B, L. imperialis (Miyake & Baba, 1967), holotype, ov. F 5.2 mm (BLIH 205a). C, L. juturna n. sp., holotype, F 4.2 mm (MNHN-IU-2013-17404). D, L. laevirostris (Balss, 1913), syntype, F 4.9 mm (ZMB17488). E, L. pallas n. sp., holotype, F 6.9 mm (MNHN-IU-2014-13395). F, L. paris n. sp., holotype, ov. F 4.0 mm (MNHN-IU-2011-4471). G, L. priam n. sp., holotype, M 5.0 mm (MNHN-IU-2014-13697). H, L. sinon n. sp., holotype, F 8.3 mm (MNHN-IU-2014-13711). I, L. turnus n. sp., holotype, M 8.0 mm (MNHN-IU-2014-13744). Scale = 1 mm.

FIGURE 17. Leiogalathea paris n. sp., holotype, ov. F 4.0 mm, French Polynesia (MNHN-IU-2011-4471). 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, right P1, dorsal view. F, right P2, lateral view. G, dactylus of right P2, lateral view. H, right P3, lateral view. Scales: A, E, F, H = 1.0 mm; B–D, G = 0.5 mm.

FIGURE 21. A, Leiogalathea achates n. sp., holotype, ovigerous female 3.6 mm (MNHN-IU-2016-7125), Mayotte- Glorieuses islands. B, Leiogalathea agassizii, male 6.7 mm (MNHN-IU-2013-18858), Guadeloupe Island. C, Leiogalathea evander n. sp., male 5.9 mm (MNHN-IU-2015-146), Papua New Guinea. D, Leiogalathea pallas n. sp., male 8.3 mm (MNHN- IU-2014-13775), Vanuatu. E, Leiogalathea paris n. sp., female 5.4 mm (MNHN-IU-2013-1727), New Caledonia. F, Leiogalathea priam n. sp., male 5.2 mm (MNHN-IU-2015-212), Papua New Guinea. Dorsal view.