Subfamily Ammotrophinae Durham 1955 (sand dollar)
Echinoidea - Clypeasteroida - Clypeasteridae
Full reference: J. W. Durham. 1955. Classification of clypeasteroid echinoids. California University Publications in Geological Sciences 31:73-198
Parent taxon: Clypeasteridae according to A. Kroh and A. B. Smith 2010
See also Durham 1955
Sister taxa: Arachnoidinae, Clypeaster, Clypeasterinae, Diplothecanthus
Subtaxa: Ammotrophus Monostychia Scutellinoides
Type: Ammotrophus
Ecology: slow-moving semi-infaunal detritivore
Distribution: