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An echinoderm (/ ɪ ˈ k aɪ n ə ˌ d ɜːr m, ˈ ɛ k ə-/) [2] is any animal of the phylum Echinodermata (/ ɪ ˌ k aɪ n oʊ ˈ d ɜːr m ə t ə /), which includes starfish, brittle stars, sea urchins, sand dollars and sea cucumbers, as well as the sessile sea lilies or "stone lilies". [3]
Echinasteridae contains eight genera and about 133 species. The two genera Echinaster and Henricia are the most speciose, forming species complexes. Echinaster has a largely tropical distribution and occurs in shallow seas including continental shelves, while Henricia is cosmopolitan, occurring mostly in cold waters, including polar habitats and abyssal locations. [2]
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
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).
Sea stars and other echinoderms likely evolved their unique body plans once their ancestors lost their trunk region, allowing them to move and feed differently from other animals.
Echinaster luzonicus, the Luzon sea star, [2] is a species of starfish in the family Echinasteridae, [1] found in shallow parts of the western Indo-Pacific region. It sometimes lives symbiotically with a copepod or a comb jelly, and is prone to shed its arms, which then regenerate into new individuals.
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