Extractrix dockeryi, a new species from the Eocene of the southeastern United States, with notes on open coiling in the Cancellariidae (Gastropoda: Neogastropoda)

Abstract

Extractrix dockeryi is described from beds of Middle Eocene (Bartonian) age in the Gosport Sand Formation at Little Stave Creek, Alabama and the contemporaneous McBean Formation at Orangeburg, South Carolina. This new species represents the earliest occurrence of open coiling in the family Cancellariidae. Other records of open coiling in the Cancellariidae are reviewed, and the taxonomic status and composition of the genus Extractrix is discussed.