The main class of Pelmatozoa were the Crinoidea which includes sea lily and feather star.

(sensu lato) or Crinozoa s.l., were in some systems a large taxon, sometimes considered a subphylum of echinoderms.

The body of these ancient Echinodermates is anchored to the bottom through a stem analogous to the epistome of Phoronidea.

Fossils date back at least to Cambrium so they've been on Earth for over 500 million years.

In the past, they were a numerous group of marine fauna and many groups belong to lead fossils, however today only one smaller class remains extant.