Histocrinus aegina

Sea lilies (more properly known as crinoids) are marine filter-feeders which latch onto surfaces underwater. Their arms extend out from its cup or calyx, the structure at the end of its column. These organisms survive by catching small particles of food with their arms and pulling these scraps into their mouths. Don’t let the flower-like shape of this “lily” deceive you - crinoids are actually animals. (William Ausich 1996, “Phylum Echinodermata”). This taxon is in the Articuliformes clade, which eventually gave rise to post-Paleozoic crinoids.