ammonites
Stenocyathus Pourtales 1871 (stony coral)

Anthozoa - Scleractinia - Guyniidae

Alternative spelling: Stenocathus

Parent taxon: Guyniidae according to J. W. Wells 1956

Sister taxa: Cyathosmilia, Guynia, Onchotrochus, Pourtalocyathus, Schizocyathus

Subtaxa: Stenocyathus alabamiensis, Stenocyathus hoffmeisteri, Stenocyathus vermiformis

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Ecology: stationary intermediate-level epifaunal suspension feeder