The British Herpetological Society

The Herpetological Journal is the Society's prestigious quarterly scientific journal. Articles are listed in Biological Abstracts, Current Awareness in Biological Sciences,Current Contents, Science Citation Index, and Zoological Record.

The 2017/18  impact factor of The Herpetological Journal is 1.268

ISSN 0268-0130


pdf 12. Morphological variation within Thamnodynastes pallidus (Linnaeus, 1758) (Serpentes: Dipsadidae: Xenodontinae: Tachymenini)

681 downloads

Open Access

pp. 165-174

Authors: Romulo Pantoja Nóbrega, Giovanna Gondim Montingelli, Vivian Trevine, Francisco Luis Franco, Gustavo H.C. Vieira, Gabriel C. Costa & Daniel Oliveira Mesquita

Abstract: The genus Thamnodynastes is comprised of 19 valid species distributed throughout South America. Thamnodynastes pallidus is associated with the Amazon region and the Atlantic forest of northeastern Brazil, exhibiting a disjunct distribution. The characters employed in the definition of this species are controversial, and its morphological variation is poorly known. Some authors do not consider its distribution in the Atlantic Forest, attributing these specimens to T. almae. This study aims to compare the Amazonian and the Atlantic populations of T. pallidus by performing an analysis of morphological (colouration, morphometry, pholidosis and hemipenial morphology) and geographical variations. We examined 70 specimens of T. pallidus from the Atlantic Forest, and 61 from the Amazon Forest. A logistic regression selected the number of infralabials, number of subcaudals, and snout length as the only predictors that could discriminate the two populations. The distribution model shows regions with higher climatic suitability for T. pallidus spread across the Amazon basin and the Atlantic Forest. We provide sufficient evidence to characterise T. pallidus, and differentiate it from its congeners. Although we demonstrate the occurrence of variation with respect to some meristic and hemipenial characters between and within each population, we conclude that these variations are not sufficient to recognise them as distinct species.  

Key words: Amazon Forest, Atlantic Forest, hemipenis, pholidosis, South America, Squamata

Download Access:

The latest 8 issues can be downloaded when logged in with a Herpetological Journal subscription membership.

Individual articles can be purchased for download.

Older issues and occasional Open Access articles are available for public download

Submissions:

For further information and submission guidelines please see our Journal Instructions to Authors

pdfBHS Ethics Policy

IMPORTANT NOTE - JUNE 2020

Please note that as from Volume 31 Number 1 (January 2021) on, the Herpetological Journal will be available as an online publication only - the last print edition will be Volume 30 Number 4.   

Aligning with this change, it is now no longer possible to purchase a subscription that includes a print copy of the HJ.  All members who have existing HJ print subscriptions that remain active as at end June 2020 will receive the full four 2020 print editions.  New subscribers or renewals after this time will only have option to subscribe to the online only subscription package.  Subscription pricing has been amended to reflect the content changes.