AN OVERVIEW OF RESEARCH ON COLEOID CEPHALOPODS FROM TERTIARY ROCKS OF SOUTHERN NORTH AMERICA
Meyer & Aldrich (1886), preformed the first research on Tertiary coleoids from southern North America when they described Belemnosis americana from Claibornian sediments of
After a long hiatus, Jeletzky (1969), continued research into comparative morphology, phylogeny and classification of coleoid cephalopods but did not describe any new Tertiary specimens from North America. Garvie (1996) described one new species of Belosaepia from the Eocene of Texas. Weaver & Ciampaglio (2003), erected a new genus of belosaepiid, Anomalosaepia based on guard-like sheaths that were in some ways similar to Belosaepia, but markedly different.
Weaver et al. (2007), after acquiring several phragmocone steinkerns from the Eocene of North Carolina, recognized two different types, those with low angle, almost parallel septae as Beloptera? sp. and those with very strongly oblique septae as Anomalosaepia sp. Recently, Ciampaglio & Weaver (2008) reported, two types of diminutive, guard like sheaths from the Oligocene of Alabama. One is most likely a spirulid, while the other is so unlike other coleoids they were unable to place it into a family. These specimens, though possibly juvenile, marked the first record of Oligocene coleoids from North America.
Though the number of species of Eocene Belosaepia from North America is comparable to