Petuch, E. J. (1992). New ecphoras (Gastropoda: Thaididae: Ecphorinae) from the Calvert Formation of Maryland (Langhian Miocene). The Nautilus. 106 (2): 68-71.
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Petuch, E. J.
1992
New ecphoras (Gastropoda: Thaididae: Ecphorinae) from the Calvert Formation of Maryland (Langhian Miocene)