Valvata Mathiasi N. Sp. (gastropoda: Heterobranchia: Valvatidae) from the Lower Pliocene of the Val Di Pesa (tuscany, Central Italy)

A new extinct freshwater gastropod species of the family Valvatidae, Valvata mathiasi n. sp., belonging to rich molluscan assemblages from Lower Pliocene deposits of the Pesa river valley (Tuscany, Central Italy), is described. This is a further example of a species local to that basin, enhancing the high endemic character of the recorded freshwater assemblages. Nevertheless, eastern affinities are recognised at genus and species level among the gastropods collected there.