This sea lily may be the poorly known
Monachocrinus caribbeus, the only member of its family, Bathycrinidae, previously recorded from the Gulf of Mexico. We found large numbers of these crinoids in some areas attached to hard elevated substrates. It displays the parabolic filtration fan posture characteristic of most stalked crinoids, with arms curved back into the current and mouth oriented downcurrent (to right in this image).
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