Shastoceras

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Shastoceras
Fossil range: Lower Aptian of the Cretaceous
Annuloceras and Shastoceras behemothi
Annuloceras and Shastoceras behemothi
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Family: Heteroceratidae
Genus: Shastoceras

Shastoceras ("Shasta's horn") is an extinct genus of ammonite cephalopod found in Lower Aptian sediments in Northern California.

It, like its close relative, Annuloceras, is a heteromorph ammonite that strongly resembles Macroscaphites.