The Cypraeidae and Ovulidae (Mollusca; Caenogastropoda) from the Cook Mountain Formation (Bartonian, Middle Eocene) of the Gulf Coastal Plain, Southern United States: a province of unsuspected generic origins

摘要

The fossil assemblage of Cypraeoidea from the Gulf Coastal Plain Lutetian-Bartonian section comprises only one Cypraeidae and six Ovulidae. The five species previously published were misidentified at the generic level. The single Cypraeidae among this assemblage represents a genus new to science. Among the six Ovulidae are precursors of living Pseudosimnia (s.s.), Cymbovula (s.s.) and Primovula (s.s.). New taxa include Garviea n. gen., Allmoniella n. gen., A. magnolia n. sp., Pseudosimnia (Vokesina) n. subgen., P. (V.) anteana n. sp., Cymbovula (Winklea) n. subgen., and Primovula (Squiresia) n. subgen. This revision portrays a revolutionary view of generic origins with first appearance data among the middle Eocene Cypraeoidea of the Gulf Coastal Plain of the Southeastern United States. Comparisons are made with the Middle Eocene Ovulidae of western France, and a new ovulid genus Lozouetina is named from the French Bartonian.