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.

 ISSN 0268-0130

2021 Impact Factor from Clarivate for the Herpetological Journal is 1.194, an increase of 0.332 from 2020.

pdf 02. The paradoxical frog Pseudis paradoxa: larval habitat, growth and metamorphosis


Open Access

Authors: Downie, J.R.; Ramnarine, I.; Sams, K. & Walsh, P.T.

Abstract: The genus Pseudis is unique amongst anuran amphibians in that body growth occurs mostly or entirely in the larval phase, with huge tadpoles metamorphosing into adult-sized frogs. Tadpole growth rate, metamorphic duration and tadpole habitat were studied in the paradoxical frog Pseudis paradoxa in Trinidad, West Indies, in order to assess the factors which may have led to the evolution of this unique life history. Growth rate was shown to be similar to other tropical tadpoles: Pseudis simply continued to grow, rather than progress to metamorphosis. Metamorphic duration fitted well with a model based on tadpole size. Sexual dimorphism in tadpole size was apparent, with females larger than males at metamorphosis. Pseudis tadpoles initially possess highly cryptic patterning, which is lost as they grow larger. The costs and benefits of continued growth in the larval phase in a permanent tropical swamp habitat are discussed in terms of potential predators and food availability to both Pseudis larvae and adults.


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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.