Echinoidea - Clypeasteroida - Laganidae

Alternative combination: Merriamaster coalingaensis

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 and Grant and Hertlein 1938

Sister taxa: Sismondia arnoldi, Sismondia convexa, Sismondia javana

Ecology: slow-moving semi-infaunal detritivore

Distribution: found only at Jacalitos Creek (Miocene to Pliocene of California)

Show more details

Specimen images are retrieved through the ePANDDA API.