ammonites
†family Guyniidae Hickson 1910 (stony coral)

Anthozoa - Scleractinia

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

Sister taxon: Flabellidae

Subtaxa: Cyathosmilia, Guynia, Onchotrochus, Pourtalocyathus, Schizocyathus, Stenocyathus

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Ecology: stationary intermediate-level epifaunal suspension feeder