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Dixonius mekongensis PAUWELS, PANITVONG, KUNYA & SUMONTHA, 2021

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Higher TaxaGekkonidae, Gekkota, Sauria, Squamata (lizards: geckos)
Subspecies 
Common NamesThai: จิ้งจกดินแม่โขง (Djing-djok din Mekong
E: Mekong leaf-toed gecko
F: Dixonius du Mékong
G: Mekong Blattfingergecko 
SynonymDixonius mekongensis PAUWELS, PANITVONG, KUNYA & SUMONTHA 2021
Dixonius mekongensis — DONBUNDIT et al. 2024 
DistributionE Thailand (Ubon Ratchathani Province: Pha Taem National Park and surroundings)

Type locality: sandstone platform (ca. 15°27’19.1”N, 105°34’12.0”E), Na Pho Klang Sub-district, Khong Chiam District, Ubon Ratchathani Province, eastern Thailand.  
Reproduction 
TypesHolotype: AUP 02007 (field no. MS 561), adult male caught by T. Kaewmanee on 2 July 2009.
Paratypes: PSUZC-R 736 (field no. MS 624), adult male, and AUP 02008 (field no. MS 562), adult female. Same locality, collecting date and collector as holotype. 
DiagnosisDiagnosis: Dixonius mekongensis can be distinguished from all other congeneric species by the combination of its maximal known SVL of 51.2 mm; 16 longitudinal rows of dorsal tubercles; 32 to 34 paravertebral scales; 22 to 24 longitudinal rows of ventrals across the abdomen; seven precloacal pores in males, no pores in females; a marked canthal stripe; and a uniform or spotted dorsal pattern (Pauwels et al. 2021).


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CommentDistribution: for a map of Dixonius type localities see Yodthong et al. 2025. 
EtymologyThe specific epithet refers to the Mekong River and the Greater Mekong Subregion. A cliff bordering the type-locality offers a spectacular view of this majestic river. 
References
  • 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
  • PAUWELS, O. S., CHOMNGAM, N., LARSEN, H., & SUMONTHA, M. 2020. A new limestone-dwelling leaf-toed gecko (Gekkonidae: Dixonius) from coastal hills in Cha-am, peninsular Thailand. Zootaxa 4845 (1): 97-108 - get paper here
  • PAUWELS, O. S., DAS, S., KUNYA, K., SUMONTHA, M., DONBUNDIT, N., PAUWELS, T. P., ... & MEESOOK, W. 2025. A new sandstone-dwelling leaf-toed gecko (Gekkonidae: Dixonius hinchangsi) from Khon Kaen Province, northeastern Thailand. Zootaxa 5584 (4): 482-504 - get paper here
  • 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
  • SUMONTHA, MONTRI; NIRUT CHOMNGAM, EAKARIT PHANAMPHON, PARINYA PAWANGKHANANT, CHUTINTON VIRIYAPANON, WANLADA THANAPRAYOTSAK & OLIVIER S. G. PAUWELS 2017. A new limestone-dwelling leaf-toed gecko (Gekkonidae: Dixonius) from Khao Sam Roi Yot massif, peninsular Thailand. Zootaxa 4247 (5): 556–568 - get paper here
  • SUMONTHA, MONTRI; OLIVIER S. G. PAUWELS 2020. A new leaf-toed gecko (Gekkonidae: Dixonius) from the city of Ranong, southwestern Thailand. Zootaxa 4852 (2): 166–176 - get paper here
  • Yodthong, S., Rujirawan, A., Grismer, L.L., Stuart, B.L. & Aowphol, A. 2025. Molecular verification and phylogenetic placement of leaf-toed geckos (Dixonius: Squamata: Gekkonidae) in Thailand. Zootaxa, 5666 (4): 550–566 - get paper here
 
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