Shastoceras

Shastoceras Temporal range: Early Aptian Aptian PreꞒ Ꞓ O S D C P T J K Pg N
Shastoceras behemoth & S. californicum
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Ammonoidea
Family:	Ancyloceratidae
Genus:	Shastoceras Anderson, 1938
Species
S. californicum type S. behemoth

Shastoceras is a genus of extinct ammonites found in Lower Aptian sediments in Northern California. Although sometimes placed in the , a family characterized by a helically wound early portion, its form indicates it more likely belongs to the Ancyloceratidae.^{[citation needed]}

Shastoceras resembles Uhligia from the Lower Barremian of Germany, except for being stouter. In both genera the initial portion is short and in general straight, followed by a more or less 180 deg. bend and a straight to moderately curved shaft ending in a hook. The shaft of Shastoceras is shorter and broader than that of Uhligia.

References[]

• W.J. Arkell, et al., 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L. Geological Society of America and University of Kansas Press.

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