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Cyrtodactylus phetchaburiensis PAUWELS, SUMONTHA & BAUER, 2016

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Higher TaxaGekkonidae, Gekkota, Sauria, Squamata (lizards: geckos) 
Subspecies 
Common Names 
SynonymCyrtodactylus phetchaburiensis PAUWELS, SUMONTHA & BAUER 2016 
DistributionThailand (Phetchaburi)

Type locality: Thailand, Phetchaburi Province, Tha Yang District, Klatluang Subdistrict, Khao (= Mountain) Tomo, Tham (= Cave) Khao Tomo (12°47.98’N, 99°44.36’E) Map legend:
Type locality - Type locality.
 
Reproduction 
TypesHolotype. IRSNB 2682 (formerly IRSNB 16682), adult male (Fig. 1); collected by local villagers, September 2003.
Paratype. IRSNB 2683 (formerly IRSNB 16650), adult female (Fig. 2); Thailand, Phetchaburi Province, Tha Yang District, collector unknown, no date. 
CommentSimilar species: C. oldhami, C. peguensis; Other Phetchaburi material initially referred to C. oldhami has been tentatively assigned to Cyrtodactylus phetchaburiensis sp. nov., but with some reservation (Pauwels et al. 2016).

Diagnosis. A medium-sized Cyrtodactylus (SVL to at least 63.2 mm); body slender; limbs and digits relatively long, slender; original tail longer than SVL; enlarged pair of first postmental scales in contact with one another behind mental, a smaller pair of enlarged chin shields (second postmentals) lateral to these; small, mostly keeled tubercles in 20 regular longitudinal rows on dorsum; 33 scales across mid-venter between lowest rows of flank tubercles; ventrolateral folds weakly developed and atuberculate; enlarged row of femoral scales present; five precloacal pores in male, femoral pores and precloacal groove absent; 5–6 broad basal lamellae and 11 narrow distal lamellae beneath digit IV of pes; most of post-pygal portion of tail atuberculate, a single median row of transversely enlarged subcaudal scales present. Colour pattern of large, dark markings with diffuse edges on a fawn background extending from shoulders to sacrum. A pair of dark scapular patches and a broad occipital band outlined by thin white borders. Flanks pale brown with scattered lighter blotches. Tail distinctly banded with thicker brown annuli, becoming darker posteriorly, alternating with narrower white annuli or bands.

Comparisons with other species. Wood et al. (2012) established that there was a geographically coherent pattern of phylogenetic relationships among Cyrtodactylus. The Thai material they sampled did not constitute a monophyletic group, but fell out in several clusters in a more inclusive clade that included most members of the genus exclusive of those occurring west of the Salween River. Some groups within this large clade are especially well-circumscribed geographically and are also generally morphologically distinctive from the new species and other Thai Cyrtodactylus. These include the members of the Philippine/Bornean clade, the Australo-Papuan clade and the Lesser Sunda clade (see Wood et al. 2012), as well as the distinctive peninsular Indian/Sri Lankan members of the subgenus Geckoella Gray (Agarwal & Karanth 2015). However, because Thai, Indochinese, and peninsular Malaysian taxa are less strictly geographically constrained, it is appropriate to compare the new species with all of these.
Ngo & Grismer (2012) and Pauwels & Sumontha (2014) provided a summary of Cyrtodactylus from these regions that have precloacal pores but lack femoral pores, the condition shown by C. phetchaburiensis sp. nov. Among these taxa, the new species may be distinguished by its possession of enlarged femoral scales from C. aurensis, C. bobrovi, C. buchardi, C. chauquangensis, C. cryptus, C. durio, C. elok, C. hontreensis, C. nigriocularis, C. otai, C. pageli, C. pantiensis, C. pseudoquadrivirgatus, C. spelaeus, C. stresemanni, C. sumonthai, and C. sworderi.
By its possession of enlarged subcaudal scales, Cyrtodactylus phetchaburiensis sp. nov. is distinguished from C. bidoupimontis, C. buchardi, C. bugiamapensis, C. cattienensis, C. chauquangensis, C. cryptus, C. cucdongensis, C. durio, C. irregularis, C. martini, C. metropolis, C. pantiensis, C. papilionoides, C. payacola, C. pseudoquadrivirgatus, C. quadrivirgatus, C. stresemanni, C. sworderi, C. vilaphongi, and C. ziegleri.
By its possession of 20 longitudinal rows of dorsal tubercles at midbody, Cyrtodactylus phetchaburiensis sp. nov. is distinguishable from C. buchardi (25), C. eisenmanae Ngo (14), C. elok (5–10), C. hontreensis (14), C. nigriocularis (0), C. pageli (9–14), C. papilionoides (12–14), C. spelaeus (10), C. stresemanni (13), C. sumonthai (12), and C. wangkulangkulae Sumontha, Pauwels, Suwannakarn, Nutatheera & Sodob (10).
Among remaining species C. phetchaburiensis sp. nov. is distinguished by a lower number of lamellae beneath digit IV of the pes (16–17) from C. doisuthep (19), C. leegrismeri (18–20), C. puhuensis (23), C. samroiyot (20), C. sanook (20), C. surin (18), C. teyniei (19–20), C. wayakonei (19–20); and by a lower number of precloacal pores (5) than C. angularis (6), C. doisuthep (6), C. intermedius (8–10), C. phuquocensis (7–9), C. samroiyot (7), C. teyniei (14 in female holotype) and C. wayakonei (6–8), and a greater number of precloacal pores than C. paradoxus (0–4), and C. thuongae (0–1).
In addition, the colour pattern of C. phetchaburiensis sp. nov. is distinctly different from all Thai, Malay, and Indochinese Cyrtodactylus that share the lack of femoral pores, presence of six or fewer precloacal pores, enlarged femoral scales present, broad subcaudal scutes, and 19–24 dorsal rows of tubercles (or condition unknown). Specifically, it differs from C. condorensis (Smith), C. doisuthep, C. leegrismeri, C. puhuensis, C. saiyok, C. samroiyot, C. sanook, C. thochuensis, C. thuongae and C. yangbayensis in lacking body bands or well-defined transverse markings, from C. angularis in lacking W-shaped dorsal markings, from C. wayakonei in lacking a reticulated pattern on the head and in possessing a well-defined nuchal loop, from C. paradoxus in lacking a thin, pale vertebral stripe and in having an entire (versus bisected) nuchal loop, from C. peguensis in lacking a reticulated pattern on the head and discrete dark dorsal spots separated by narrow pale margins or reticulations, and from C. oldhami in having a diffuse pattern of dark blotches on a light background rather than four longitudinal series of white spots. In addition, C. phetchaburiensis sp. nov. differs from all of these species is having discrete, dark scapular patches with thin white borders.

Habitat: The holotype was found by day at about two meters above the ground within a cave-like crevice formed by large karst boulders in a secondary forest area. Ecological information from other referred specimens, from Kaeng Krachan and Tha Yang districts, suggests that the species occurs in moist evergreen forest and climbs on vegetation-covered walls and tree trunks. 
EtymologyThe specific epithet refers to Phetchaburi Province, south-western Thailand, to which the new species appears to be endemic. 
References
  • NGO, VAN TRI & L. LEE GRISMER 2012. A new endemic species of Cyrtodactylus Gray (Squamata: Gekkonidae) from Tho Chu Island, southwestern Vietnam. Zootaxa 3228: 48–60
  • PAUWELS, OLIVIER S. G. & MONTRI SUMONTHA 2014. Cyrtodactylus samroiyot, a new limestone-dwelling Bent-toed Gecko (Squamata: Gekkonidae) from Prachuap Khiri Khan Province, peninsular Thailand. Zootaxa 3755 (6): 573–583 - get paper here
  • PAUWELS, OLIVIER S. G.; MONTRI SUMONTHA & AARON M. BAUER, 2016. A new Bent-toed Gecko (Squamata: Gekkonidae: Cyrtodactylus) from Phetchaburi Province, Thailand. Zootaxa 4088 (3): 409–419 - get paper here
  • Wood Jr, Perry L.; Matthew P. Heinicke, Todd R. Jackman, Aaron M. Bauer 2012. Phylogeny of bent-toed geckos (Cyrtodactylus) reveals a west to east pattern of diversification. Molecular Phylogenetics and Evolution 65: 992–1003 - get paper here
 
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