Sarax indochinensis sp. nov.

urn:lsid:zoobank.org:act: 20DCB29C-E29F-4F43-8BB7-40B02BCF4FF6

Figs 103, 112–114; Table 8

Sarax brachydactylus – Fage 1946b: 79 (in part).

Sarax aff. brachydactylus – Seiter et al. 2015: 545.

Diagnosis

This species may be separated from other species of Sarax in Southeast Asia and Oceania by the following combination of characters: median and lateral eyes well developed (Fig. 112A); ventral sacs and ventral sac cover well developed; female gonopod finger-like with small invagination apically (Fig. 113A); cheliceral basal segment with small tooth adjacent to bifid tooth; secondary sexual dimorphism in males with longer pedipalp segments than females; pedipalp tarsus with two short dorsal spines; leg IV basitibia with four pseudo-articles, distitibia sc and sf series each with five trichobothria.

This species resembles S. brachydactylus, but the genital operculum is concave, with two symmetric bulges unlike that of S. brachydactylus, which is flat.

Etymology

The species name is an adjective derived from Indochina, the region of Southeast Asia which included Cambodia, Laos, and Vietnam, under French control between ca 1890–1950.

Type material

Holotype THAILAND • ♀; Koh Kut [Ko Kut]; [11°40′05.07″ N, 102°33′51.21″ E]; B. Degerbøl leg.; 6 Apr. 1959; ZMUC 21613.

Paratypes THAILAND • 3 ♀♀, 7 ♂♂, 1 juv.; same locality as for holotype; B. Degerbøl le g.; 5 Apr. 1959; ZMUC 21612 .

VIETNAM • 1 ♀; Annam, Ha Tien, Kien Giang Province; Hang Trong Nguc (Da Dung mountain); 10°25′44.8″ N, 104°28′36.6″ E; 7 Jan. 2010; H. Steiner leg. (Northern Lao-European Cave Project 2010); SMF 029/10 .

Additional material

CAMBODIA • 1 ♀; Sré Umbel [Srae Ambel]; [11°07′01.82″ N, 103°44′43.14″ E]; Feb. 1939; Mission C. Dawydoff, Indochine, 1938–1939; MNHN • 1 ♂; Kampong Speu; Apr. 1939; Mission C. Dawydoff, Indochine, 1938–1939; MNHN • 1 ♀, 2 juv.; Ream; [10°35′02.75″ N, 103°38′35.34″ E]; Mar. 1939; Mission C. Dawydoff, 1938–1939, Indochine; MNHN • 1 ♂; [11°34′37.44″ N, 103°07′41.04″ E]; 10 m a.s.l.; 3 Dec. 2014; J. Nigl leg.; NHMW 27601 • 1 juv.; Koh Chang; [12°04′28.60″ N, 102°18′35.95″ E]; under bark; 13 Jan. 1900; Th. Mortensen leg.; ZMUC 21614 .

VIETNAM • 1 ♂; Phaurang, Tour Cham; May 1939; Mission C. Dawydoff, Indochine 1938–1939; MNHN • 1 ♂; Banghoi [Ba Ngôi], Indochine; May 1939; Mission C. Dawydoff; 1938–1939; MNHN • 2 juv.; Golf Du Siam [ Gulf of Thailand]; Nov. 1938; P. Dama, Mission C. Dawydoff, Indochine, 1938– 1939; MNHN • 1 ♀, 1 ♂; Hang Bong Lai; 10°25′42″ N, 104°28′39″ E; H. Steiner leg.; SMNS 86 • 1 ♀; Hang 8; 10°25′45″ N, 104°28′37.8″ E; H. Steiner leg.; SMNS 87 .

NO DATA • 4 juv.; MNHN • 1 ♀, 7 protonymphs; MNHN • 1 ♀, 1 ♂, 1 juv.; MNHN • 2 ♀; MNHN .

Description

CARAPACE. Six anterior setae (Fig. 112A); frontal process triangular (Fig. 112C). Small granules densely scattered between ocular triads and among sulci. Median eyes and median ocular tubercle well developed (Fig. 112C); pair of setae on median ocular tubercle; lateral eyes well developed, pale, seta lateral to lateral ocular triad; lateral ocular triad near carapace margin; curved carina between ocular triads and carapace margin (Fig. 112C).

STERNUM. Tritosternum projected anteriorly with typical setation, long, surpassing base of pedipalp coxae (Fig. 112B); other sternal platelets narrow, projecting, with pair of setae anteriorly on plaque and some smaller setae posteriorly; pentasternum with four setae near membranous region.

OPISTHOSOMA. Ventral sacs cover well developed.

GENITALIA. Female genital operculum with short setae posteromedially; pair of white bulges medially and slender setae apically (Fig. 113A–C); gonopod finger-like, unsclerotized basally (Fig. 113A, C, F); denticulate margin between gonopod and posterior margin of genital operculum (Fig. 113E); slit sensilla laterally on genital operculum (Fig. 113E). Male gonopod as wide as long, wider in distal third (Fig. 114C); Lol2 fimbriate with small spines apically on projections (Fig. 114A–B, D); PI with smooth surface and acute apex (Fig. 114F); dorsal lobe short, with spines on inner margin and ventrally, and apex curved outwards (Fig. 114C, G); LaM short, not fused medially, with smooth surface (Fig. 114A– B); fistula with inner spines (Fig. 114E).

CHELICERAE. Retrolateral surface of basal segment with short projection, opposite to bifid tooth; retrolateral surface of claw with row of setae basally to medially; claw with five teeth; more than two rows of several setae on prolateral surface of basal segment; bifid tooth on basal segment with dorsal cusp larger than ventral cusp.

PEDIPALPS. Coxae without seta encircled by round carina and with three setae on margin. Femur with four dorsal spines and four ventral spines (Fig. 112E–F); two prominent setiferous tubercles between dorsal spine 1 and proximal margin; long spine between ventral spine 1 and proximal margin, two-thirds length of spine 1. Patella with four dorsal spines in primary series (Fig. 112E); prominent setiferous tubercle distal to spine I; three ventral spines (Fig. 112F); setiferous tubercle between spine I and distal margin. Tibia with ventral spine distally and two setae between spine and distal margin. Tarsus with two subequal dorsal spines (Fig. 112D); cleaning organ with 30–32 setae in ventral row.

LEGS. Tibia of leg I with 23 articles; tarsus I with 41 articles; first and second tarsal articles equal in length. Leg IV basitibia with four pseudo-articles, with sclerotized, denticulate margin at apex of articles; trichobothrium bt situated slightly closer to distal third of pseudo-article; distitibia trichobothrium bc situated equidistant between bf and s bf, and sc and sf series each with five trichobothria.

Measurements

See Table 8.

Distribution

Known from Cambodia, Thailand and Vietnam. The distribution of this species overlaps that of Weygoldtia davidovi .

Remarks

Material from Cambodia (Sre Unebell, Réam) in the MNHN was misidentified as S. brachydactylus by Fage (1946).