Published online by Cambridge University Press: 19 May 2016
By the end of the Cretaceous, the Clavagellidae (Mollusca: Pelecypoda) maintained a distribution that was marginal to the core-Tethys, occurring in both North America and the Old World. Traditional paleozoogeographic interpretation contends that the clavagellids then went extinct in the New World because no Cenozoic fossil or living clavagellids have been documented from the Western Hemisphere. This report describes the occurrence of Eocene clavagellids from the Ocala Group of peninsular Florida. The presence of these pelecypods in Upper Eocene strata is consistent with the large Tethyan faunal component already known from this unit and requires a reassessment of Tertiary zoogeographic patterns for the clavagellids.