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单词 sea cucumber
释义

sea cucumber


sea cucumber

n. Any of various cucumber-shaped echinoderms of the class Holothuroidea, characteristically having tentacles surrounding the mouth and a flexible body with tube feet usually arranged in longitudinal rows. Also called holothurian.

sea cucumber

n (Animals) any echinoderm of the class Holothuroidea, having an elongated body covered with a leathery skin and bearing a cluster of tentacles at the oral end. They usually creep on the sea bed or burrow in sand [C17: so named because of its cucumber-like shape]

sea′ cu`cumber


n. any echinoderm of the class Holothuroidea, having a long, body and tentacles around the mouth. [1595–1605]

sea cucumber

Any of various invertebrate sea animals related to starfish and sea urchins, having a rough cucumber-shaped body and a mouth surrounded by tentacles. To distract an attacking predator, a sea cucumber can expel some of its internal organs, which later grow back.
Thesaurus
Noun1.sea cucumber - echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feetsea cucumber - echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet; free-living mud feedersholothurianechinoderm - marine invertebrates with tube feet and five-part radially symmetrical bodiesclass Holothuroidea, Holothuroidea - class of echinoderms including the sea cucumbersHolothuria edulis, trepang - of warm coasts from Australia to Asia; used as food especially by Chinese
Translations
balate

sea cucumber


sea cucumber,

any of the flexible, elongated echinoderms belonging to the class Holothuroidea. Although sea cucumbers have the basic echinoderm radial symmetry (see EchinodermataEchinodermata
[Gr.,=spiny skin], phylum of exclusively marine bottom-dwelling invertebrates having external skeletons of calcareous plates just beneath the skin. The plates may be solidly fused together, as in sea urchins, loosely articulated to facilitate movement, as in sea
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), they do not have arms like starfish. Instead the oral-anal distance is greatly increased, resulting in the typical cucumber-shaped body.

Sea cucumbers live with one side facing permanently down. Like other echinoderms, sea cucumbers have a water-vascular system; the locomotor tube feet are concentrated in three areas on the ventral, or under, side, in some species forming a muscular, creeping sole. Some species burrow in sand or mud and have lost all tube feet. The leathery body wall contains minute, scattered skeletal ossicles, or bonelike plates; a few species have an armor of close-set plates.

Some species eat bottom material, while others use tube feet modified as branched oral tentacles to capture particles or plankton and transfer them to the mouth. Most sea cucumbers have highly branched tubes called respiratory trees attached to the intestine near the anus. Water is pumped in and out, facilitating respiratory exchange and excretion. In some species, branches called tubules of Cuvier, attached to or near the bases of the respiratory trees, are ejected when the organism is attacked; they swell and become sticky, entangling the pursuer. Many sea cucumbers eject most of the internal organs when sufficiently irritated, later regenerating a new set.

Sea cucumbers have a single, branched gonad. Eggs are usually expelled into the sea where, after fertilization, free-swimming larvae develop. After a second larval stage, metamorphosis occurs and the adult body shape appears.

Sea cucumbers occur in all seas and at all depths. Most do not exceed 1 ft (30.5 cm) in length, but Stichopus variegatus from the Philippines may reach 3 ft (91 cm) in length. Known as trepang or bêche-de-mer, a number of species are caught along warm coasts of Australia, the East Indies, and some Pacific island nations. They are dried and sold, mainly to markets in E Asia, for use as food or in traditional medicine. Sea cucumbers are classified in the phylum Echinodermata, class Holothuroidea.

sea cucumber

[′sē kyü‚kəm·bər] (invertebrate zoology) The common name for the echinoderms that make up the class Holothuroidea.

See sea cucumber

sea cucumber


sea cucumber

A cylindrical marine invertebrate of the family Holothuria; some species have tentacles that contain a mild venom. Contact with the organism may produce dermatitis.

sea cucumber


  • noun

Synonyms for sea cucumber

noun echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet

Synonyms

  • holothurian

Related Words

  • echinoderm
  • class Holothuroidea
  • Holothuroidea
  • Holothuria edulis
  • trepang
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