Periarchus protuberans Clark and Twitchell 1915 (sand dollar)

Echinoidea - Clypeasteroida - Protoscutellidae

Full reference: W. B. Clark and M. W. Twitchell. 1915. The Mesozoic and Cenozoic Echinodermata of the United States. United States Geological Survey Bulletin 54:1-341

Belongs to Periarchus according to W. B. Clark and M. W. Twitchell 1915

See also Cooke 1942

Sister taxa: Periarchus altus, Periarchus kewi, Periarchus lyelli, Periarchus pileussinensis, Periarchus quinquefarius, Periarchus rutriformis

Type specimen: Its type locality is Shubuta Creek, which is in an Eocene marginal marine horizon in Mississippi

Ecology: slow-moving semi-infaunal detritivore

Distribution:

• Eocene of United States (2: Alabama, Mississippi collections)

Total: 2 collections each including a single occurrence

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Specimen images are retrieved through the ePANDDA API.


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