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Named By: McLearn in 1927
Time Period: Jurassic
Location: Australia - Newmarracarra Limestone Formation. Possible also North America
Size: Unavailable
Diet: Carnivore
Fossil(s): Many individuals represented by fossilised shells
Classification: | Mollusca | Cephalopoda | Ammonoidea | Ammonitida | Stephanocerataceae | Otoitidae |

Zemistephanus is an extinct ammonite genus from the middle Jurassic of western North America and Western Australia, named by McLearn 1927. Zemistephanus is included in the sephanoceratoid family Otoitidae, which are characterized by shells that begin as barrel-shaped cadicones but which become planulate later in life. Body chambers are reduced in size and are excentric. Similar genera are Pseudotoites and Emileia

Read more about Zemistephanus at Wikipedia
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