Abstract
The study of the material gathered in a new locality of fossil Fishes found in the messinian marls, near Cherasco (Piedmont, Italy), leads one to point out the occurrence of three different species (one of which is new) in this locality. The analysis of the process of pachyostosis which seems to have affected in a selective way some of their representatives is made possible by the detailed investigation of the Cyprinodontid and Gobiid Fishes. In the light of this analysis, the taxonomic status of the genus Pachylebias WOODWARD is reevaluated. From a palaeoecological and palaeogeographical point of view, the locality of Cherasco seems to fit with an ancient water-body with a variable salt-content, which may have been more or less temporarily connected with the sea.
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