†Cystolonsdaleia Fomichev 1953 (horn coral)
Anthozoa - Stauriida - Petalaxidae
Parent taxon: Petalaxidae according to J. Fedorowski et al. 2007
Sister taxa: Antheria, Huanglongophyllum, Ivanovia, Lithostrotionella, Lytvophyllum, Omaniphyllum, Paralithostrotion, Petalaxis, Protoivanovia
Subtaxa: Cystolonsdaleia arctica, Cystolonsdaleia berthiaumi, Cystolonsdaleia carteri, Cystolonsdaleia danneri, Cystolonsdaleia guaspariniae, Cystolonsdaleia hormos, Cystolonsdaleia neriae, Cystolonsdaleia obesa, Cystolonsdaleia zulloi
Ecology: stationary epifaunal suspension feeder