Anthozoa - Stauriida - Petalaxidae

Alternative combination: Petalaxis guaspariniae

Full reference: C. H. Stevens and B. Rycerski. 1989. Early Permian colonial rugose corals from the Stikine River area, British Columbia, Canada. Journal of Paleontology 63(2):158-181

Belongs to Cystolonsdaleia according to J. Fedorowski et al. 2007

Sister taxa: Cystolonsdaleia arctica, Cystolonsdaleia berthiaumi, Cystolonsdaleia carteri, Cystolonsdaleia danneri, Cystolonsdaleia hormos, Cystolonsdaleia neriae, Cystolonsdaleia obesa, Cystolonsdaleia zulloi

Type specimen: GSC 85277. Its type locality is GSC 28946 (SE-S52.1.56), Arctic Lake, Stikine, which is in an Asselian shallow subtidal limestone in Canada.

Ecology: stationary epifaunal suspension feeder