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 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.