Publication: 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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Issued Date
2024-01-01
Resource Type
ISSN
13132989
eISSN
13132970
Scopus ID
2-s2.0-85203698529
Journal Title
ZooKeys
Volume
1211
Start Page
101
End Page
130
Rights Holder(s)
SCOPUS
Bibliographic Citation
ZooKeys Vol.1211 (2024) , 101-130
Suggested Citation
Ampai N., Rujirawan A., Yodthong S., Termprayoon K., Stuart B.L., Aowphol A. 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. ZooKeys Vol.1211 (2024) , 101-130. 130. doi:10.3897/zookeys.1211.122563 Retrieved from: https://hdl.handle.net/20.500.14740/20966
Corresponding Author(s)
Other Contributor(s)
Abstract
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 Rat-chasima 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 paraver-tebral tubercles; 20 or 21 longitudinal rows of dorsal tubercles; 43 or 44 ventral scales; seven or eight expanded subdigital lamellae on the 4th toe; 12 unmodified subdigital lamellae on the 4th toe; 19 or 20 total subdigital lamellae on the 4th 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-pre-cloacal 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.