Florometra serratissima is a species of crinoid or feather star in the family Antedonidae.

The mouth is located on the upper side at the centre of the calyx, with the anus nearby.

These branch at the base to form ten or more arms, each of which has jointed appendages known as pinnules growing from it, in a feather-like fashion.

The centre of each arm has an ambulacral groove down which food particles are moved by cilia to the mouth.

[2] These crinoids can live on either rocks or soft sediment, and can move around using their cirri as feet, or can swim by beating their arms; they are suspension feeders, choosing locations with strong currents and extending their arms to catch plankton floating past.