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Echinoderms possess a simple digestive system which varies according to the animal's diet. Starfish are mostly carnivorous and have a mouth, oesophagus, two-part stomach, intestine and rectum, with the anus located in the centre of the aboral body surface. With a few exceptions, the members of the order Paxillosida do not possess an anus.
Oreaster reticulatus, commonly known as the red cushion sea star or the West Indian sea star, is a species of marine invertebrate, a starfish in the family Oreasteridae. It is found in shallow water in the western Atlantic Ocean and the Caribbean Sea.
These are very particular stars, plump and pillow-shaped, more or less pentagonal. Their five arms have waned to only obtuse angles (and sometimes rounded off or truncated).
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Brittle stars, serpent stars, or ophiuroids (from Latin ophiurus 'brittle star'; from Ancient Greek ὄφις (óphis) 'serpent' and οὐρά (ourá) 'tail'; referring to the serpent-like arms of the brittle star) are echinoderms in the class Ophiuroidea, closely related to starfish. They crawl across the sea floor using their flexible arms ...
Culcita schmideliana, commonly known as the spiny cushion star, is a species of pin-cushion star.It has a variety of base colors and often patches of a different color. It is pentagonal in shape and lives in the tropical Indo-Pacif
This is not, however, the case with echinoderms like starfish, sea urchins, and sea cucumbers. Instead, these creatures are driven by an unusual five-fold symmetry , also called radial symmetry.
Sea urchin tube feet extended past the spines.. Tube feet (technically podia) are small active tubular projections on the oral face of an echinoderm, such as the arms of a starfish, or the undersides of sea urchins, sand dollars and sea cucumbers; they are more discreet though present on brittle stars, and have only a feeding function in feather stars.