†Sismondia arnoldi Clark and Twitchell 1915 (sand dollar)
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Echinoidea - Clypeasteroida - Laganidae
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 Sismondia according to W. S. W. Kew 1920
See also Clark and Twitchell 1915
Sister taxa: Sismondia coalingaensis, Sismondia convexa, Sismondia javana
Ecology: slow-moving semi-infaunal detritivore
Distribution:
• Quaternary of United States (1: California collection)
• Miocene to Pliocene of United States (1: California)
Total: 2 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
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