Resumen

NUNEZ, Verónica. Revision of two species of Physidae. Rev. Mex. Biodiv. [online]. 2011, vol.82, n.1, pp.93-108. ISSN 2007-8706.

In spite of the several works about the systematic of Physidae, the taxonomic situation of the entities of this family present in Argentina is still confused. Therefore, the study of the 2 more frequent species in Argentina was approached, their description were updated to confirm its taxonomic status and to facilitate its correct identification. Individuals, from 5 different localities of each species, were analyzed. For re-description, fundamentally characteristics of shell, external morphology, radula, and reproductive system, were analyzed. Differences between species, on shell and soft parts characteristics, were separately analyzed, by means of statistical methods (principal component and discriminant analysis). The observed characters allowed concluding that the correct denomination of the studied species here is Stenophysa marmorata (Guilding, 1828) and Physa acuta Draparnaud, 1805. Although there are differences among shell of these 2 species, it was demonstrated that it is important the observation of the soft parts for a correct determination.

Palabras llave : Argentina; Gastropoda; morphology; Physa acuta; Physella cubensis; synonymy; Stenophysa marmorata; taxonomy.

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