ammonites
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Margarites semiornata Zinsmeister 1983

PaleoDB taxon number: 373710

Full reference: W. J. Zinsmeister. 1983. New Late Paleocene molluscs from the Simi Hills, Ventura County, Califonia. Journal of Paleontology 57(6):1282-1303

Belongs to Margarites according to W. J. Zinsmeister 1983

Sister taxa: Margarites (Margarites), Margarites (Pupillaria), Margarites sericeus, Margarites striatus, Margarites vahlii

Type specimen: UCR 6873/181, a shell. Its type locality is Meier Canyon, which is in a Thanetian open shallow subtidal conglomerate in the Simi Formation of California.

Average measurements (in mm): shell 12.0 x 14.0