Echinoidea - Calycina - Phymosomatidae

Alternative combinations: Cyphosoma hilli, Pseudodiadema hilli

Belongs to Phymosoma according to C. W. Cooke 1953

See also Clark and Twitchell 1915

Sister taxa: Phymosoma baylei, Phymosoma binexilis, Phymosoma corneti, Phymosoma dixie, Phymosoma gehrdenense, Phymosoma gigantea, Phymosoma hexoaporum, Phymosoma maastrichtensis, Phymosoma peloria, Phymosoma princeps, Cyphosoma volanum, Cyphosoma canali, Cyphosoma riograndensis

Ecology: slow-moving low-level epifaunal omnivore

Distribution: found only at Bell County (Cretaceous of Texas)

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Specimen images are retrieved through the ePANDDA API.