Leiogalathea laevirostris ( Balss, 1913 )

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: 237-239

publication ID

https://doi.org/10.11646/zootaxa.4560.2.1

publication LSID

lsid:zoobank.org:pub:9BB2184A-1C96-49AF-AD98-457931B4D5B9

persistent identifier

http://treatment.plazi.org/id/CD51661F-031A-FFF1-FF3C-C8D7FC57A042

treatment provided by

Plazi

scientific name

Leiogalathea laevirostris ( Balss, 1913 )
status

 

Leiogalathea laevirostris ( Balss, 1913) 

( Figs. 11DView FIGURE 11; 15View FIGURE 15)

Galathea laevirostris Balss, 1913: 221  .— Doflein & Balss 1913: 140, fig. 7, pl. 12, fig. 1.

Dubious identifications: Galathea laevirostris  . — Laurie 1926: 135. Leiogalathea laevirostris  . — Baba 2005: 88, 246.— Ahyong 2007: 14, fig. 8.— Rowden et al. 2010: tab. 3, 4.— Yaldwyn & Webber 2011: 213.

Type material. Lectotype: Sombrero Channel , Nicobar Islands. VALDIVIA Stn 211, 805 m, 8 February 1899: 1F 4.9 mm ( ZMB 17488View Materials). 

Paralectotype: Sombrero Channel , Nicobar Islands. VALDIVIA Stn 211, 805 m, 8 February 1899: 1 M 4.8 ( ZMB 17488View Materials B)  .

Description. Carapace: 1.3 × as long as broad. Mid-transverse ridge interrupted, followed by 5 interrupted transverse ridges. Lateral margins straight and subparallel, with 2 spines: first spine anterolateral well-developed; second small spine on anterior branchial margin; hepatic and posterior branchial margin unarmed. Rostrum horizontal, dorsally flattish or slightly concave, 1.5 × as long as broad, length 0.3 × and breadth 0.2–0.3 × that of carapace; lateral margin serrated, with 4 or 5 small teeth decreasing in size distally.

Sternum: Sternite 3 moderately broad, 3.0 × as wide as long, somewhat produced anterolaterally, anterior margin serrated, straight, with a median shallow notch. Sternite 4 narrowly contiguous to sternite 3; surface depressed in midline, smooth; greatest width 3.3 × that of sternite 3, 2.2 × as wide as long.

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

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

Antennule: Article 1 with a spine on distomesial angle; lateral margin smooth.

Antenna: Article 1 with strong distomesial spine nearly reaching end of article 2; article 2 with subequal distolateral and distomesial spines, 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: 2.7 (female, lost in male) × carapace length, with numerous short striae, and uniramous long setae scattered on merus to dactylus. Merus 0.9 length of carapace, 2.4 × as long as carpus, with strong mesial and distal spines, some scattered dorsal spines. Carpus slightly shorter than palm, 1.6 × as long as broad, dorsal surface with scattered spines, mesial margin with 3 strong spines, lateral margin unarmed. Palm, 1.9 × as long as broad, armed with spines in irregular longitudinal rows on mesial and lateral margins, dorsal surface unarmed. Fingers as long as palm; fixed finger with a row of spines along lateral border; movable finger with well-developed proximal mesial spine.

P3 (other pereiopods lost): Slender, somewhat compressed laterally, with short setiferous striae on dorsal surface, with sparse long and thick setae on ischium to dactylus. Merus, 0.7 × carapace length, 5 × as long as broad, 1.2 × as long as propodus; P3 merus 4.2 × as long as broad, 1.2 × as long as P3 propodus; extensor margins with a row of 7 proximally diminishing spines; flexor margin with 1 well-developed distal spine and several projecting scales. Carpi with 2 distal spines on extensor margin; flexor margin with small distal spine. Propodi 9 × as long as broad, flexor margin with 4 movable spinules. Dactyli 0.6 × length of propodi; distal claw short, moderately curved; flexor margin nearly straight, with 7 small teeth along entire margin decreasing in size proximally, each with slender movable spinule, ultimate tooth closer to base of distal claw than to penultimate tooth.

Colour in life. Unknown.

Genetic data. No data.

Distribution. Andaman Sea, 805 m.

Remarks. Leiogalathea laevirostris  belongs to the group of species having the hepatic margin of the carapace unarmed, the branchial margin with or without a spine, and the margin of the rostrum armed with 4 or 5 small teeth. The closest relatives are L. juturna  from Indonesia and Taiwan, L. paris  from Polynesia, Papua New-Guinea and New Caledonia, and L. priam  from Papua New-Guinea. Leiogalathea laevirostris  can be differentiated from these congeners by the more slender P2–4 propodi (9 versus 5–6 × as long as broad) and the distomesial margin of the antennule being armed with a small spine instead of being unarmed.

Unfortunately, we were not able to obtain molecular data for L. laevirostris  .

ZMB

Museum für Naturkunde Berlin (Zoological Collections)

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Galatheidae

Genus

Leiogalathea

Loc

Leiogalathea laevirostris ( Balss, 1913 )

Rodríguez-Flores, Paula C., Macpherson, Enrique & Machordom, Annie 2019
2019
Loc

Galathea laevirostris

Balss, H. 1913: 221
Doflein, F. & Balss, H. 1913: 140
1913