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Anatomy of a stalked crinoid. The basic body form of a crinoid is a stem (not present in adult feather stars) and a crown consisting of a cup-like central body known as the theca, and a set of five rays or arms, usually branched and feathery.
Articulata are a subclass or superorder within the class Crinoidea, including all living crinoid species. They are commonly known as sea lilies (stalked crinoids) or feather stars (unstalked crinoids). The Articulata are differentiated from the extinct subclasses by their lack of an anal plate in the adult stage and the presence of an ...
Endoxocrinus parrae is a species of stalked crinoids of the family Isselicrinidae. It is the most commonly found isocrinine species in west Atlantic Ocean. [1] Morphology
Anatomy of a stalked crinoid attached to the sea bottom, a sea lily. Bathycrinus aldrichianus is a ten-armed sea lily, the first and second arms, the fourth and fifth, and the seventh and eighth having syzygies (being joined together at the base). The arms are connected to the base ring of the crown and consist of a series of jointed ...
Metacrinus rotundus, the Japanese sea lily, is a species of stalked crinoid in the family Isselicrinidae. It is a species found off the west coast of Japan, near the edge of the continental shelf at a depth of around 100 to 150 metres (330 to 490 ft) deep. This is the shallowest-living species among the extant stalked crinoids.
Cenocrinus is a monotypic genus of stalked crinoids in the family Isselicrinidae. The great West Indian sea lily (Cenocrinus asterius) is the only species in the genus and is found in deep waters in the Caribbean Sea and Gulf of Mexico.
Holdfast torn from the sea floor by a storm Eocrinoid holdfasts on an Ordovician hardground in Utah. A holdfast is a root-like structure that anchors aquatic sessile organisms, such as seaweed, other sessile algae, stalked crinoids, benthic cnidarians, and sponges, to the substrate.
Neocrinus decorus are epibenthic and may form aggregations in certain locales. [5] [2] Like other crinoids, they are suspension feeders, filtering out organic material and plankton that the current brings to their outstretched arms (the "filtration fan").