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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.
Starfish are also known as asteroids due to being in the class Asteroidea. About 1,900 species of starfish live on the seabed in all the world's oceans, from warm, tropical zones to frigid, polar regions. They are found from the intertidal zone down to abyssal depths, at 6,000 m (20,000 ft) below the surface. Starfish are marine invertebrates ...
It is the largest phylum that has no freshwater or terrestrial members. There are five classes of echinoderms: Asteroidea (starfish), Ophiuroidea (brittle star), Echinoidea (sea urchin), Crinoidea (sea lily) and Holothuroidea (sea cucumber). The following list provides echinoderms currently identified in Sri Lankan waters.
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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).
The revelations, made possible by new methods of genetic sequencing, could help answer some of the biggest remaining questions about echinoderms, including their shared ancestry with humans and ...
Thromidia gigas is a species of starfish in the family Mithrodiidae. It was described by Ole Theodor Jensen Mortensen in 1935. [1] It lives in the Indian Ocean off the coast of eastern South Africa and southern Madagascar. [1] [2] This species is probably the largest echinoderm in terms of bulk, and may exceed 13 pounds (5.9 kg). [3]
Astrophyton muricatum, the giant basket star, is an echinoderm found in shallow parts of the tropical western Atlantic and throughout the Caribbean Sea and the Gulf of Mexico. [1] It is the only species in the genus Astrophyton. [2] During the day, it curls up into a tight ball shape to protect itself from predators.