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  Forest sea cucumber
(Thyone sp
)
 Stephenson's sea cucumber
(Rowia stephensoni)
 
Any of various cucumber-shaped echinoderms of the class Holothuroidea, having a flexible body with tentacles surrounding the mouth.The internal skeleton consists merely of numerous tiny bits in the skin. Most species have five rows of tube feet extending from mouth to anus.The 10 or more retractile tentacles surrounding the mouth are used for taking food (mud containing nutrients or small aquatic animals) or burrowing.
Locomotion is sluglike

APODIDA  Footless sea cucumbers.
The order contains approximately 269 species in 32 genera and three families. Tentacles are digitate, pinnate, or, in some small species, simple. Respiratory trees are absent. Tube feet are completely absent. The calcareous ring is low and bandlike, without posterior projections. The body wall is very thin and often transparent. These sea cucumber are found in both shallow and deep water.

ELASIPODIDA Deep-sea sea cucumbers.
The order contains approximately 141 species in 24 genera and five families. Tentacles are shield shaped and used in shoveling sediment. Respiratory trees are present. The calcareous ring is without posterior projections. With the exception of one family, Deimatidae, the body wall is soft to gelatinous. All forms live in deep water.

ASPIDOCHIROTIDA Shield-tentacle sea cucumbers.
There are approximately 340 species in 35 genera and three families in this order. Tentacles are shield shaped, that is, flattened and pad-like. Respiratory trees are present. The calcareous ring is without posterior projections. The body wall is generally soft and pliant. Most forms live in shallow water, although one family is restricted to the deep sea.

MOLPADIIDA Rat-tailed sea cucumbers.
Approximately 95 species compose 11 genera and four families in this order. Tentacles are digitate to simple. Respiratory trees are present. The calcareous ring may have short posterior projections. The body wall is generally soft and pliant. Most forms live in relatively shallow water, although one family is restricted to the deep sea.

DENDROCHIROTIDA. Suspension-feeding sea cucumbers.
The order contains approximately 550 species in 90 genera and seven families. Tentacles are highly branched. Respiratory trees are present. Some members have a calcareous ring composed of numerous small pieces or have long posterior extensions. These animals have muscles for retracting the oral introvert. In a few species, the body is hardened from enlarged plate-like ossicles and is U shaped. These sea cucumbers live either attached to hard bottoms or burrow in soft sediment. Most species live in shallow water.

DACTYLOCHIROTIDA. U-shaped sea cucumbers.
The order contains approximately 35 species in seven genera and three families. Tentacles are simple or have a few small digits. Respiratory trees are present. The calcareous ring is without posterior projections. These sea cucumbers have muscles for retracting the oral introvert. All members have a rigid body encased in enlarged flattened ossicles. The body usually is U shaped. All members live burrowed in soft sediment. Most live in deep water.

Reference:Answers.com
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