Periarchus Conrad 1866 (sand dollar)

Echinoidea - Clypeasteroida - Protoscutellidae

Full reference: T. A. Conrad. 1866. Check list of the invertebrate fossils of North America: Eocene and Oligocene. Smithsonian Miscellaneous Collections 7:1-41

Parent taxon: Protoscutellidae according to J. W. Durham 1955

See also Clark and Twitchell 1915, Cooke 1942, Durham 1966, Kier 1968, Kier 1997 and Sepkoski 2002

Sister taxa: Mortonella, Protoscutella

Subtaxa: Periarchus altus Periarchus kewi Periarchus lyelli Periarchus pileussinensis Periarchus protuberans Periarchus quinquefarius Periarchus rutriformis

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Ecology: slow-moving semi-infaunal detritivore

Distribution:

• Eocene of United States (82: Alabama, Florida, Georgia, Mississippi, North Carolina, South Carolina collections)

Total: 82 collections including 84 occurrences

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