Echinoidea - Arbacioida

Parent taxon: Arbacioida according to A. B. Smith and C. W. Wright 1993

See also Fell and Pawson 1966 and Grant and Hertlein 1938

Sister taxa: Acropeltidae, Arbaciidae, Arbacioina, Dialithocidaris, Glypticidae, Goniopygidae, Pygmaeocidaris, Salenioina

Subtaxa: Tetrapygus niger

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Ecology: slow-moving low-level epifaunal grazer

Distribution: found only at Caleta Patillos (Quaternary of Chile)

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Specimen images are retrieved through the ePANDDA API.