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A new species of karst-dwelling bent-toed gecko of the Cyrtodactylus intermedius group (Squamata, Gekkonidae) from eastern Thailand and the phylogenetic placement of C. intermedius
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A new species of karst-dwelling bent-toed gecko of the Cyrtodactylus intermedius group (Squamata, Gekkonidae) from eastern Thailand and the phylogenetic placement of C. intermedius
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A new species of karst-dwelling bent-toed gecko of the Cyrtodactylus intermedius group (Squamata, Gekkonidae) from eastern Thailand and the phylogenetic placement of C. intermedius
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Journal Article
A new species of karst-dwelling bent-toed gecko of the Cyrtodactylus intermedius group (Squamata, Gekkonidae) from eastern Thailand and the phylogenetic placement of C. intermedius
2024
Overview
A new karst-dwelling bent-toed gecko of the Cyrtodactylus intermedius group is described from Khlong Hat District, Sa Kaeo Province, eastern Thailand, based on an integrative taxonomic analysis of genetic data and morphological characteristics. Phylogenetic analyses using the mitochondrial NADH dehydrogenase subunit 2 (ND2) gene revealed that topotypes of C. intermedius were sister to a clade containing C. kulenensis from Cambodia, an unnamed lineage from Sakaerat Biosphere Reserve in Nakhon Ratchasima Province, Thailand, and the Khlong Hat lineage described here as Cyrtodactylus khlonghatensis sp. nov. Multivariate analyses of morphometric and meristic characters showed that C. khlonghatensis sp. nov. is morphologically distinct from all other species in the group by having the combination of SVL 76.5–82.8 mm in adult males and 88.5 mm in an adult female; eight supralabial and nine infralabial scales; 30–32 paravertebral tubercles; 20 or 21 longitudinal rows of dorsal tubercles; 43 or 44 ventral scales; seven or eight expanded subdigital lamellae on the 4 th toe; 12 unmodified subdigital lamellae on the 4 th toe; 19 or 20 total subdigital lamellae on the 4 th toe; 31 or 32 total number of enlarged femoral scales; enlarged femoral and precloacal scales continuous; 6–8 pore-bearing precloacal scales in males; three or four rows of enlarged post-precloacal scales; 1–3 postcloacal tubercles; proximal femoral scales less than one-half the size of distal femoral scales; absence of interdigital pocketing between digits of forefeet and hindfeet; and posterior border of the nuchal loop rounded. Uncorrected pairwise genetic divergences ( p -distances) between the new species and other species of the intermedius group ranged from 4.73–22.55%. The discovery of this new species exclusively in isolated karst formations from the Thai-Cambodia border suggests that there may be further undiscovered Cyrtodactylus in unexplored karst landscapes along the border of eastern Thailand and western Cambodia.
