''Rotadiscus'' is a genus of discoidal animal known from the Cambrian

Chengjiang biota The Maotianshan Shales are a series of Early Cambrian deposits in the Chiungchussu Formation, famous for their '' Konservat Lagerstätten'', deposits known for the exceptional preservation of fossilized organisms or traces. The Maotianshan Shales ...

and classified with the

eldoniid Eldoniids are an extinct clade of enigmatic disc-shaped animals which lived in the early to middle Paleozoic (Cambrian to Devonian). They are characterized by their "medusoid" (jellyfish-shaped) bodies, with the form of a shallow dome opening belo ...

s. As with other eldoniids, it was originally thought to have been pelagic, but is now thought to be benthic.

References

Cambrian invertebrates Fossils of China Fossils of Canada Prehistoric animal genera {{Cambrian-animal-stub Cambrian genus extinctions