Isocrinida Sieverts-Doreck 1952

Neocrinus decorus is a bottom-dwelling sea lily.

Proisocrinus ruberrimus, the Moulin Rouge sea lily

Proisocrinus ruberrimus, the Moulin Rouge sea lily

Proisocrinus ruberrimus, the Moulin Rouge sea lily, can live at depths of 1,800m and has only been encountered during deep sea scientific sampling expeditions.

Pentacrinites fossilis

Neocrinus decorus arm with pinnae (top) and a cirri (bottom).

The arms of Neocrinus decorus. To catch plankton, crinoids such as N. decorus form their arms into a parabolic fan which they position within a current.

Infections can cause malformations of the calcite plates of Neocrinus decorus.

Neocrinus decorus has mucus-covered tube feet on the pinnae of its arms which extend into the water and catch plankton.

Seirocrinus subangularis was a filter feeder that lived attached to a floating tree trunk.

Coastal trawling is a threat to Metacrinus rotundus as it lives at relatively shallow depths.

Metacrinus rotundus is a marine animal with a fan-like crown of arms supported by a tether-like stalk. It uses the arms, which are covered in rows of feather-like appendages (pinnules), to trap food such as plankton.

Metacrinus rotundus continues growing throughout its lifetime and is able to regrow its arms and stalk if they are damaged. The stalk can be as long as 40cm in adults.