Trigonodactylus arabicus (HAAS, 1957)
Can you confirm these amateur observations of Trigonodactylus arabicus?
|Higher Taxa||Gekkonidae, Gekkota, Sauria, Squamata (lizards: geckos)|
|Common Names||E: Arabian Short-fingered Gecko, Arabian Sand Gecko|
|Synonym||Trigonodactylus arabicus HAAS 1957|
Stenodactylus arabicus — KLUGE 1967
Stenodactylus arabicus — KLUGE 1993
Stenodactylus arabicus — RÖSLER 2000: 115
Stenodactylus arabicus — FUJITA & PAPENFUSS 2011
Trigonodactylus arabicus — NAZAROV et al. 2018
|Distribution||Saudia Arabia, Qatar, United Arab Emirates, S Oman, Bahrain, Kuwait, Iran|
Type locality: Trucial Coast, Saudi Arabia (24° 10’ N, 53° E).
|Types||Holotype: CAS 84321; paratypes: CAS, FMNH|
|Diagnosis||Diagnosis (genus): Ground-dwelling, psammophilous, small-sized geckos (SVL less than 40 mm versus SVL more than 40 mm in Stenodactylus and Pseudoceramodactylus). Habitus very slender. Head and body strongly flattened (as compared with massive head and round body in Stenodactylus and Pseudoceramodactylus). Head elongated and relatively narrow as opposed to large, well-defined head in Stenodactylus and Pseudoceramodactylus. Edges of fingers and toes with large elongated triangular scales that form a fringed edge. Claws thin and long, significantly compressed. Minute, imbricate, triangular scales cover undersides of fingers; only a few transversely widened scales at their tips (usually three). Upper surface of hands covered with keeled, imbricate, rather elongated scales. Toes elongated, slender, with strongly compressed long claws; margins of toes fringed; web between fingers present in some species. Dorsal scales flat, juxtaposed with each other, slightly keeled, elliptic. Ventral scales slightly keeled. Contracted pupil forms a vertical slit. No precloacal or femoral pores (present in some Stenodactylus). Moderate hemipenial swellings; two-three precloacal spurs on each side at basis of tail. Tail round in cross-section, tapering uniformly; length equal to that of body.|
Prefrontal relatively small with rounded distal surface; no prefrontal projection; postorbitofrontal relatively small with rounded distal edge; nasal relatively small, of same size as premaxillary (versus relatively larger prefrontal often with apical growth, relatively larger posterior frontal with elongated distal edge, which are typical for representatives of Stenodactylus and Pseudoceramodactylus. Locomotion of this group of geckos is very distinctive. Trigonodactylus move pressing their body to the surface of the substrate, where Stenodactylus keep their body raised high above the surface (from Nazarov et al. 2018; original diagnosis in Haas 1957: 51).
Diagnosis (species, as Stenodactylus): The only Stenodactylus species with extensively webbed feet. Small, up to 40 mm from snout to vent; toes depressed with a lateral fringe of pointed scales and many scales beneath; rostral and upper labial scales reach nostril; preanal pores absent; cloacal tubercles usually in a single row; tail autotomy general; prefrontal projection absent; upper border of prootic not sloping downwards; epipterygoid close to skull roof in protracted skull; usually 26 presacral vertebrae; 5 nuchal ribs; 5 basal caudal vertebrae; clavicle not expaqded [ARNOLD 1980].
|Comment||Synonymy: WERMUTH 1965 gives “Stenodactylus arabicus” also as original name. Trigonocephalus HAAS 1957 was resurrected from synonymy of Stenodactylus by Nazarov et al. 2018 (note that Nazarov et al. mis-spelled Haas as “Hass” more often than it was spelled correctly as “Haas”).|
Distribution: See map in SMID et al. 2014 for distribution in Iran.
Type species: Trigonodactylus arabicus HAAS 1957 is the type species of the genus Trigonodactylus HAAS 1957.
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