Canistrumella alternata Rigby, 1986 Petaloptyon danei is a goblet-shaped hexactinellid sponge known from rare fragments from the Middle Cambrian Burgess Shale.
A few specimens of Petaloptyon are known from the Greater Phyllopod bed, where they comprise under 0.01% of the community.
[1] The fragments show the living animal had a stalk, and had panels with a lattice pattern.
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