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Dixonius siamensis (BOULENGER, 1899)

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Higher TaxaGekkonidae, Gekkota, Sauria, Squamata (lizards: geckos)
Subspecies 
Common NamesE: Siamese Leaf-toed Gecko
G: Siam-Blattfingergecko 
SynonymPhyllodactylus siamensis BOULENGER 1899: 918
Phyllodactylus paviei MOCQUARD 1904 (fide SMITH 1935)
Phyllodactylus burmanicus ANNANDALE 1905 (fide SMITH 1935)
Phyllodactylus siamensis — SMITH 1935: 81
Phyllodactylus siamensis — TAYLOR 1963: 750
Phyllodactylus siamensis — WERMUTH 1965: 144
Phyllodactylus siamensis — KLUGE 1993
Dixonius siamensis — BAUER et al. 1997
Phyllodactylus siamensis — COX et al. 1998: 89
Dixonius siamensis — CHAN-ARD et al. 1999: 117
Dixonius siamensis — RÖSLER 2000: 77
Dixonius siamensis — NGUYEN et al. 2009
Dixonius siamensis — DONBUNDIT et al. 2024 
DistributionThailand, Annam, Siam (Dung-Phya-Fai), Vietnam, Laos, Cambodia ?

Type locality: Dung-Phya Fai Mountains, eastern Siam.  
Reproductionoviparous 
TypesSyntypes: BMNH 1946.8.24.40-41, 97.3.31.1-2 
DiagnosisDiagnosis (genus): Amongst others, the presence of precloacal pores, the tuberculate dorsum, the reduction in length of phalanx 2 of digit IV of the manus, and the proximally bifurcate hypoischium are characteristic features that serve to diagnose this genus from all other leaf-toed geckos (Bauer et al. 1997).


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CommentKaryotype: Dixonius siamensis consists of karyologically different populations. Specimens from E Thailand had 2n = 40 chromosomes while specimens from NW Thailand invariably had 2n = 42 chromosomes (Ota et al. 2001).

Type species: Phyllodactylus siamensis BOULENGER 1899 is the type species of the genus Dixonius Bauer, Good & Branch 1997.

Comparisons: Sumontha & Pauwels 2020: 174 (Table 2) present a comparison of all 10 species of Dixonius. Luu et al. 2023: 151 present tables with meristic, categorical, and morphometric data of Dixonius from Vietnam and Laos.

Distribution: Reports from India and Myanmar are in error (A. Bauer, pers. comm. 30 Aug 2011). For a map of type localities of all Dixonius see Luu et al. 2023: 145, DONBUNDIT et al. 2024: 540 (Fig. 8).

Type locality: Sumontha et al. (2017) believe that the interpretation of the type locality of Phyllodactylus paviei by Das (2004: 629) is erroneous. Das (2004) matched Mocquard’s ‘‘Vatana’’ with ‘‘Chaeng Wattana, ca. 13°45’N, 100°31’E: a northern suburb of Bangkok, across the highway from the airport, Phra Nakhon Province, Thailand’’. Mocquard’s description of P. paviei appeared in the lizard chapter of a book dedicated to the study of the scientific results of the expedition of the French explorer Auguste Pavie in Indochina in 1879–1895. In the introduction of the book, a map, however locates ‘‘Vatana’’ just southeast of ‘‘Srakeo’’, and it thus certainly corresponds to Watthana Nakhon (13°43'49.13"N, 102°20'5.76"E; elev. 72 m asl), Watthana Nakhon District, in the eastern province of Sa Kaeo which borders Cambodia. The type locality reported by Das (2004) was an incorrect interpretation and was further repeated by Ngo & Ziegler (2009). Watthana Nakhon lies about 198 airline km E of Chaeng Watthana, and is located southeast of the type localities of both D. melanostictus and D. siamensis. 
EtymologyNamed after its ocurrence in Thailand, formerly “Siam”.

The genus has been named after James R. Dixon (1 August 1928 – 10 January 2015) who spent most of his academic life at Texas A&M University. The species is named after its occurrence in Thailand, formerly “Siam”. 
References
  • Annandale, N. 1905. Notes on some Oriental geckos in the Indian Museum, Calcutta, with descriptions of new tons. Ann. Mag. nat. Hist. (7) 15:26-32 - get paper here
  • Annandale, Nelson 1905. Contributions to Oriental Herpetology. Suppl. II. Notes on the Oriental lizards in the Indian Museum, with a list of the species recorded from British India and Ceylon. J. Proc. Asiat. Soc. Bengal (2) 1: 81-93 - get paper here
  • Bauer A M. Good D A. Branch W R. 1997. The taxonomy of the Southern African leaf-toed geckos (Squamata: Gekkonidae), with a review of Old World "Phyllodactylus" and the description of five new genera. Proc. Cal. Acad. Sci. 49 (14): 447-497. - get paper here
  • Bauer, A.M. 2013. Geckos - The Animal Answer Guide. Johns Hopkins University Press, 159 pp.
  • Bauer, A.M.; Sumontha, M.; Grossmann, W.; Pauwels, O.S.G. & Vogel, G. 2004. A new species of Dixonius (Squamata: Gekkonidae) from Kanchanaburi Province, Western Thailand. Current Herpetology 23 (1): 17-26 - get paper here
  • Bobrov V.V., Semenov D.V. 2008. Lizards of Vietnam [in Russian]. Moscow, 236 pp.
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  • Chan-ard, T., Parr, J.W.K. & Nabhitabhata, J. 2015. A field guide to the reptiles of Thailand. Oxford University Press, NY, 352 pp. [see book reviews by Pauwels & Grismer 2015 and Hikida 2015 for corrections] - get paper here
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  • Crane, Matt S.; Colin T. Strine, Tyler K. Knierim, Taks in Artchawakom, and Pongthep Suwanwaree 2018. Herpetofaunal Species Abundance, Richness, and Diversity in a Dry Tropical Forest and Agricultural Matrix at the Sakaerat Biosphere Reserve, Thailand. Herp. Cons. Biol. 13 (3): 586–597 - get paper here
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  • DONBUNDIT, NATTASUDA; MONTRI SUMONTHA, MANEERAT SUTHANTHANGJAI, WINAI SUTHANTHANGJAI & OLIVIER S. G. PAUWELS 2024. Another new micro-endemic, limestone-dwelling leaf-toed gecko (Gekkonidae: Dixonius) from Phetchaburi Province, western Thailand Zootaxa 5447 (4): 531-546 - get paper here
  • Geissler, P., Hartmann, T., Ihlow, F., Neang T., Seng R., Wagner, P. & Bohme, W. 2019. Herpetofauna of the Phnom Kulen National Park, northern Cambodia—An annotated checklist. Cambodian Journal of Natural History 2019 (1): 40–63 - get paper here
  • Grismer, L. Lee; Thy Neang, Thou Chav, Perry L. Wood, Jr., Jamie R. Oaks, Jeremy Holden, Jesse L. Grismer, Thomas R. Szutz and Timothy M. Youmans 2008. Additional amphibians and reptiles from the Phnom Samkos Wildlife Sanctuary in Northwestern Cardamom Mountains, Cambodia, with comments on their taxonomy and the discovery of three new species. Raffles Bulletin of Zoology 56 (1): 161-175 - get paper here
  • Grismer, L.L. et al. 2007. THE HERPETOFAUNA OF THE PHNOM AURAL WILDLIFE SANCTUARY AND CHECKLIST OF THE HERPETOFAUNA OF THE CARDAMOM MOUNTAINS, CAMBODIA. Hamadryad 31 (2): 216 – 241 - get paper here
  • Grismer, L.L., Neang, T., Chav, T. & Grismer, J.L. 2008. Checklist of the amphibians and reptiles of the Cardamom region of Southwestern Cambodia. Cambodian Journal of Natural History 2008(1): 12–28 - get paper here
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  • Mocquard, F. 1904. Lézards recueillis par M. A. Pavie en Indo-Chine. Mission Pavie Indo-Chine, 1879-95. Vol. 3. Paris, pp. 473-474
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  • Nguyen, S.V., Ho, C.T. and Nguyen, T.Q. 2009. Herpetofauna of Vietnam. Chimaira, Frankfurt, 768 pp.
  • NGUYEN, T. H., LUU, V. Q., SITTHIVONG, S., NGO, H. T., NGUYEN, T. Q., LE, M. D., & ZIEGLER, T. 2021. A new species of Dixonius (Squamata: Gekkonidae) from Vientiane Capital, Laos. Zootaxa 4965 (2): 351-362 - get paper here
  • NGUYEN, THUONG HUYEN; SALY SITTHIVONG, HANH THI NGO, VINH QUANG LUU, TRUONG QUANG NGUYEN, MINH DUC LE, & THOMAS ZIEGLER 2020. A new species of Dixonius (Squamata: Gekkonidae) from the karst forest of Khammouane Province, central Laos. Zootaxa 4759 (4): 530–542 - get paper here
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  • PAUWELS, OLIVIER S. G.; NONN PANITVONG, KIRATI KUNYA, MONTRI SUMONTHA 2021. A new sandstone-dwelling leaf-toed gecko (Gekkonidae: Dixonius mekongensis) from the Thai-Lao border. Zootaxa 4969: 526–538 - get paper here
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