Abstract
THREE non-Trachemys species of Chrysemys (sensu McDowell, 1964) have been described from the Pliocene of Florida. Hay (1908) described C. caelata, largely on the basis of shell sculpturing, from Mixson's Bone Bed* in Levy County, Florida. Hay considered this site Pleistocene in age although it had previously been recognized as Pliocene (Dall and Harris, 1892; Leidy and Lucas, 1896) and was so reassigned by Simpson in 1929. Rose and Weaver (1966) examined shells from McGehee Farm in adjacent Alachua County and described both a smooth-shelled species (C. williamsi) and a rugose species (C. carri) yet made no reference to C. caelata. Both sites represent Pliocene deposits within the Alachua Formation (Simpson, 1929; Rose and Weaver, 1966; Hirschfeld and Webb, 1968). The occurrence of two rough-shelled species in approximately equivalent strata only 34 kilometers apart prompted me to investigate their taxonomic status. All specimens are in the collections of the U.S. National Museum
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