Shastoceras is a genus of extinct ammonites 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.^{[citation needed]}

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

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.