Temporal range: Early Aptian Aptian
|Shastoceras behemoth & S. californicum|
Shastoceras is a genus of extinct ammonite cephalopod found in Lower Aptian sediments in Northern California. Although sometimes placed in the Heteroceratidae, a family characterized by a helically wound early portion, its form indicates it more likely belongs to the Ancyloceratidae.
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.
||This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (March 2013)|
- W.J. Arkell, et al., 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontlogy, Part L. Geological Society of America and University of Kansas Press.
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