ammonites
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Psammechinus (sea urchin)

Echinoidea - Camarodonta - Echinidae

PaleoDB taxon number: 33061

Parent taxon: Echinidae according to H. B. Fell and D. L. Pawson 1966

Sister taxa: Atactus, Echinus, Gracilechinus, Hypechinus, Isechinus, Paracentrotus, Stirechinus

Subtaxa: Psammechinus dubius, Psammechinus philanthropus

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Ecology: epifaunal grazer-deposit feeder