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Ammodiscus cheradospirus Loeblich and Tappan, 1950       

Class: Spirillinata  Subclass: Ammodiscana  Order: Ammodiscida  Family: Ammodiscidae
Taxon Profile

found at an  unknown locality  
Carbon County, Montana  Midwestern USA   North America

Geological Time: Jurassic  Middle Jurassic  Callovian

holotype

classification and image courtesy of
Smithsonian Institution National Museum of Natural History

View of a specimen of Ammodiscus cheradospirus Loeblich and Tappan, 1950

The classification is published in:
SINMNH Department of Paleobiology Collections Online Catalog as USNM PAL 106014
accessed 2013