Echinoderms are among the marine invertebrates that suffered the most severe losses at the end-Permian extinction. Or were they? The end-Paleozoic witnessed the most devastating mass extinction in ...

Now researchers have gotten their first-ever look at similar tentacle-like structures in an extinct group of these echinoderms. It was suspected that the ancient marine invertebrates, called ...

ECHINODERM larvae are capable of a variety ... such as unicellular algae, it shows occasional irregular periods of reverse locomotion. These are caused by reversal of the ciliary beat in the ...