Rotadiscus

Rotadiscus is a genus of discoidal animal known from the Cambrian Chengjiang biota and classified with the eldoniids.

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

A 2023 cladistic analysis based on new fossils places Rotadiscus, along with other eldoniids, as stem-group ambulacrarians.