Anthozoa - Stauriida - Petalaxidae

Parent taxon: Petalaxidae according to J. Fedorowski et al. 2007

Sister taxa: Antheria, Cystolonsdaleia, Huanglongophyllum, Ivanovia, Lithostrotionella, Omaniphyllum, Paralithostrotion, Petalaxis, Protoivanovia

Subtaxa: Lytvophyllum flexuosum, Lytvophyllum hongi, Lytvophyllum mongeri, Lytvophyllum sustutense, Lytvophyllum tschernowi, Lytvophyllum wersonae

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Type: Thysanophyllum tschernowi

Ecology: stationary epifaunal suspension feeder