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Issue: Vol. 5543 No. 3: 4 Dec. 2024
Type: Article
Published: 2024-12-04
DOI: 10.11646/zootaxa.5543.3.1
Page range: 301-328
Abstract views: 278
PDF downloaded: 17

Rediscovery and redescription of Dixonius siamensis (Boulenger, 1899) (Squamata: Gekkonidae), type species of the genus, with lectotype designation

Royal Belgian Institute of Natural Sciences; Rue Vautier 29; B-1000 Brussels; Belgium
Ecological Genetics Research Unit; Organismal and Evolutionary Biology Research Programme; Faculty of Biological and Environmental Sciences; FI-00014 University of Helsinki; Finland
Scientific Heritage; Royal Belgian Institute of Natural Sciences; Rue Vautier 29; B-1000 Brussels; Belgium & Royal Museum for Central Africa; Leuvensesteenweg 13; B-3080 Tervuren; Belgium
Irisvej 8; DK-4600; Køge; Denmark
Ranong Marine Fisheries Research and Development Station; 157 Chaloem Phrakiat Rd.; Paknam; Muang; Ranong 85000; Thailand
Reptilia Gekkota taxonomy morphology cranial osteology Myanmar Thailand

Abstract

We redescribe the type material of Phyllodactylus siamensis Boulenger, 1899, type species of the Southeast Asian gekkonid genus Dixonius Bauer, Good & Branch, 1997, using external morphology and cranial osteology. There is some evidence that the type series contains more than one species; we hence designate a lectotype in order to stabilize nomenclature and provide more precision on the geographical location of the type locality. Because the current concept of Dixonius siamensis auctorum is incomplete and composite, we provide a revised diagnosis based on the presently designated lectotype and a paralectotype from the same locality, as well as observations on new material from the type locality and the first photographs of live topotypical individuals. We regard Dixonius siamensis as probably geographically restricted to the Dong Phaya Yen mountain range in central Thailand, and the numerous published mentions of this species from outside this range likely refer to other or undescribed taxa. We treat Phyllodactylus burmanicus Annandale, 1905 from Tavoy, southern Myanmar, as a valid species, as Dixonius burmanicus comb. nov.

 

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