Jenis Crinoid Feather Stars

o So each arm is a series of ossicles extending outward from the body.
• The arms contain extensions of coelomic (body cavity), nervous, water vascular,
and reproductive systems
• They also have an ambulacra (radial area) groove bordered by fingerlike tube
feet, or podia, which are extensions of the water vascular system as well. They
are also used in suspension feeding and respiration
• All living crinoids are pinnulate, bearing a small side branch, pinnule, on
alternating sides of successive ossicles along the arm. These pinnules bear the
food-gathering tube feet.
o Pinnules arose in several lineages during the Paleozoic and are
characteristic of all post-Palaeozoic crinoids.
• Crinoids have muscles, nerves, a gut, a reproductive system and other features
Feeding
of advanced animals.
• They are all passive suspension and filter feeders and because they produce no
feeding or respiratory current, they rely more on the water movement around
them, feeding by filtering small particles of food from those seawater currents.
• Their diet consists of a variety of protists (i.e. diatoms and other unicellular algae,
foraminiferans, actinopods), invertebrate larvae, small crustaceans, and detrital
particles.
• To feed they use their featherlike arms that radiates from the central body which
each bears an open ambulacra groove bordered by triads od fingerlike podia