Legless Feather star (Clarckomanthus alternans)

Its body is formed by a disc in the shape of a chalice, composed of 2 or 3 rings of calcareous plates, which houses inside the viscera of the animal. The centrodorsal plate measures about 5 mm in diameter. The anus and mouth are located on the tegmen, or aboral surface of the disc, which has a series of pinnules around it, whose terminal segments are modified to form a protective comb.

These crinoids have between 10 and 125 arms, which are pinnulated in the same plane, which gives them.. more