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Sea cucumbers extract oxygen from water in a pair of "respiratory trees" that branch in the cloaca just inside the anus, so that they "breathe" by drawing water in through the anus and then expelling it. [12] [13] The trees consist of a series of narrow tubules branching from a common duct, and lie on either side of the digestive tract. Gas ...
The robust sea cucumber has a soft body and lacks a spine, but it does have an endoskeleton consisting of microscopic spicules, or ossicles, made of calcium carbonate. [2] C. robustus has a respiratory tree that allows it to extract oxygen for respiration, using the anus to pump water. The robust sea cucumber is an important dietary staple for ...
Evisceration is a method of autotomy involving the ejection of internal organs used by animals as a defensive strategy. Sea cucumbers (Holothuroidea) eject parts of the gut in order to scare and defend against potential predators such as crabs and fish. The organs are regenerated in a few days by cells in the interior of the sea cucumber. [1][2]
Sea cucumber emitting Cuvierian tubules. Cuvierian tubules are clusters of fine tubes located at the base of the respiratory tree in some sea cucumbers in the genera Bohadschia, Holothuria and Pearsonothuria, all of which are included in the family Holothuriidae. The tubules can be discharged through the anus when the sea cucumber is stressed.
H. tigris Brandt, 1835[ 3 ] Holothuria scabra, or sandfish, is a species of sea cucumber in the family Holothuriidae. It was placed in the subgenus Metriatyla by Rowe in 1969 and is the type species of the subgenus. [ 4 ] Sandfish are harvested and processed into "beche-de-mer" and eaten in China and other Pacific coastal communities.
Synaptidae is a family of sea cucumbers that have no tube feet, tentacle ampullae, retractor muscles, respiratory trees, or cuvierian tubules. They also lack radial canals of the water-vascular system, with only the circumoral ring present. Synaptids have elongated bodies, and their size varies significantly from small to quite large.
Sea cucumbers within the family Chiridotidae, feed on benthic sediments causing a change within the stability and stratification of the sediment. [2] The benthic sediments that they consume as food contain fungal, bacterial, and detrital organic matter. [18] The availability of food is the main driver for the Chiridotidae to move around the ...
Holothuriida is an order of sea cucumbers. [1] Taxa within the order Holothuriida were previously classified in the order Aspidochirotida, which was determined to be polyphyletic in 2017. Some taxa were also reclassified into the clades Synallactida and Persiculida. [2]