Holothurians also known as "sea cucumbers"
are generally long and wormlike; they don't look much like starfish
or sea lilies.
In most species the skeletal plates are reduced to microscopic spicules
and thus sea cucumbers do not like to other echinoderms species very
much.
Holothurians are very common in the oceans coasts; in fact, in certain
parts of the deep sea, the ocean floor swarms with vast herds of holothurians.
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