Tube-dwelling anemones or ceriantharians look very similar to sea anemones but belong to an entirely different class of anthozoans. They are solitary, living buried in soft sediments. Tube anemones live inside and can withdraw into tubes, which are composed of a fibrous material made from secreted mucus and threads of nematocyst-like organelles known as ptychocysts. Ceriantharians were formerly classified in the taxon Ceriantipatharia along with the black corals but have since been moved to their own class, Ceriantharia.
Holothuria is the type genus of the marine animal family Holothuriidae, part of the class Holothuroidea, commonly known as sea cucumbers. Members of the genus are found in coastal waters in tropical and temperate regions. They are soft bodied, limbless invertebrates that dwell on the ocean floor and are usually detritivore. They resemble a cucumber in form. The genus contains some species that are harvested and sold as food.
Dendrochirotida are an order of sea cucumbers. Members of this order have branched tentacles and are suspension feeders. Examples include Thyonella and Cucumaria.
The Stichopodidae are a family of sea cucumbers, part of the order Synallactida.
Cucumariidae is a family of sea cucumbers, marine animals with elongated bodies, leathery skins and tentacles that are found on the sea bed.
Caudinidae is a family of sea cucumbers, marine animals with elongated bodies, leathery skins and tentacles that are found on the sea floor.
Phyllophoridae is a family of sea cucumbers, marine invertebrates with elongated bodies, leathery skins and feeding tentacles.
Sclerodactyla briareus, commonly known as the hairy sea cucumber, is a species of marine invertebrate in the family Sclerodactylidae. It is found in shallow waters in the west Atlantic Ocean.
Ocnus is a genus of sea cucumbers in the family Cucumariidae.
Labidodemas is a genus of marine sea cucumbers in the family Holothuriidae. The genus was erected by Emil Selenka in 1867.
Chiridota is a genus of sea cucumbers in the family Chiridotidae. It is an extant genus but some fossil species are known.
Euapta is a genus of sea cucumbers in the family Synaptidae.
Opheodesoma is a genus of sea cucumbers in the family Synaptidae.
Psolus is a genus of sea cucumbers in the family Psolidae, marine animals with long bodies, leathery skins and tentacles, that inhabit the sea bed.
Pseudocnus is a genus of sea cucumbers.
Trachythyone is a genus of sea cucumbers in the family Cucumariidae.
Leptopentacta is a genus of sea cucumbers in the family Cucumariidae.
Afrocucumis is a genus of sea cucumbers found in coastal waters in tropical and temperate regions.
Eupentacta is a genus of sea cucumbers found in coastal waters in tropical and temperate regions.
Thyone is a genus of sea cucumbers in the family Phyllophoridae.
