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The tadpole of Pseudis minuta (Anura: Pseudidae), an apparent case of heterochrony

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image of Amphibia-Reptilia

The external morphology, oral disc, and coloration pattern of the larva of Pseudis minuta are described. Tadpoles are mostly bottom dwellers that have a small, terminal oral disc with a labial tooth row formula 1(1-1)/(1-1)2. Internal oral anatomy is characterized using scanning electron microscopy, representing the only description available for the family Pseudidae. The coloration pattern of P. minuta tadpoles is compared with that of other pseudids. Pseudis minuta larvae do not exhibit the ontogenetic coloration change reported for P. paradoxa. Considering larval coloration, larval size, and reports of adult size, acceleration or hypermorphosis are suggested as possible heterochronic mechanisms involved in the evolution of Pseudis.

Affiliations: 1: Department of Biology, University of Richmond, VA 23173, USA; 2: Fundación Miguel Lillo, Miguel Lillo 251, 4000-Tucuman, Argentina


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