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In more advanced species of starfish, the cardiac stomach can be everted from the organism's body to engulf and digest food. When the prey is a clam or other bivalve , the starfish pulls with its tube feet to separate the two valves slightly, and inserts a small section of its stomach, which releases enzymes to digest the prey.
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Diagram of water vascular system of a starfish, showing the ring canal, the radial canals, ampullae (small bulbs), and tube feet. Echinoderms possess a unique water vascular system, a network of fluid-filled canals modified from the coelom (body cavity) that function in gas exchange, feeding, sensory reception and locomotion.
Asterias diagram 1 Pyloric stomach 2 Intestine 3 Rectal gland 4 Stone canal 5 Madreporite 6 Pyloric duct 7 Pyloric cecum 8 Cardiac stomach 9 Gonad 10 Ambulacral ...
The Royal Starfish chose to consume the higher quality organism more often than the low-quality one. [6] In the same study, it was also given a choice of small-sized prey and larger-sized prey. The Royal Starfish chose to consume the smaller-sized prey more often, and this is because smaller prey decreases handling time.
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.
Madreporite of Asterias. In sea stars, water enters the system through a sieve-like structure on the upper surface of the animal, called the madreporite.This overlies a small sac, or ampulla, connected to a duct termed the stone canal, which is, as its name implies, commonly lined with calcareous material.
It is a slow-motion hunter; it may take it several days to dig its prey from the sediment, latch on to it with its tube feet, and pull the valves open. At this point, the star everts its stomach through its mouth and forces it into the shell. The star can push its stomach as far as 8 centimetres (3.1 in) from its mouth.