sea anemone


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sea anemone

(ənĕm`ənē'), any of the relatively large, predominantly solitary polyps (see polyp and medusapolyp and medusa,
names for the two body forms, one nonmotile and one typically free swimming, found in the aquatic invertebrate phylum Cnidaria (the coelenterates). Some animals of this group are always polyps, some are always medusae, and some exhibit both a polyp and a medusa
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) of the class Anthozoa, phylum Cnidaria. Unlike the closely related corals, these organisms do not have a skeleton. Sea anemones occur everywhere in the oceans, at all depths, but are particularly abundant in coastal waters. Many are beautifully colored (reds, pinks, yellows) and look like flowers when the oral, or feeding, end, equipped with many extensions called tentacles, is fully open. Some anemones are tiny, but most are from one to several inches (2.5–10 cm) long; the genus Stoichactis in the Great Barrier Reef off the coast of Australia may reach 3 ft (90 cm) in diameter at the expanded oral end. Most sea anemones attach temporarily to submerged objects; a few thrust themselves into the sand or live in furrows; a few are parasitic on other marine organisms. Some anemones feed on small particles, which are caught with the aid of a mucus secretion and moving currents that are set up by the tentacles. Most sea anemones are predaceous, immobilizing their prey with the aid of specialized stinging cells called nematocysts. Metridium is the genus most often studied in classrooms. The burrowing anemone, Cerianthuss, occurs on both Pacific and Atlantic coasts; some may reach nearly 2 ft (60 cm) in length. Sea anemones are classified in the phylum CnidariaCnidaria
or Coelenterata
, phylum of invertebrate animals comprising the sea anemones, corals, jellyfish, and hydroids. Cnidarians are radially symmetrical (see symmetry, biological).
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, class Anthozoa, subclass Zoantharia.

sea anemone

[′sē ə‚nem·ə·nē]
(invertebrate zoology)
Any of the 1000 marine cnidarians that constitute the order Actiniaria; the adult is a cylindrical polyp or hydroid stage with the free end bearing tentacles that surround the mouth.

sea anemone

any of various anthozoan coelenterates, esp of the order Actiniaria, having a polypoid body with oral rings of tentacles
References in periodicals archive ?
Chemical transmission in the sea anemone Nematostella vectensis: a genomic perspective.
Phyla- and subtype-selectivity of CgNa, a Na+ channel toxin from the venom of the Giant Caribbean Sea Anemone Condylactis gigantea.
Isolation and characterisation of five neurotoxic and cardiotoxic polypeptides from the sea anemone Anthopleura elegantissima.
But in sea anemone embryos, the lockdown loops do not exist.
Cook, "The relationship between nutritional status and carbon flux in the zooxanthellate sea anemone Aiptasia pallida," Marine Biology, vol.
The hell's fire sea anemone can be light yellowish green, tan, brown, light green or gray-monochromatic or a combination of colors-with leaf-shaped, feathery tentacles of varying sizes.
Other types of fish cannot hide or come near a sea anemone because their mouths are shielded with millions of cells that are filled with toxins and sting.
Staining protocol for the histological study of sea anemones (Anthozoa: Actiniaria) with recommendations for anesthesia and fixation of specimens
Yes, zebrafish and sea anemones are being used to study the origins of MS and to develop novel strategies for stopping the disease in its tracks and restoring function.
These anthropogenic stressors likely impact patterns of sea anemone and anemonefish recruitment, growth and mortality due to alteration of the environmental conditions on nearshore coral reefs and field methods are needed to accurately size the anemonefish and determine these demographic changes.
A sea anemone is an invertebrate sea creature that looks like a flower.
SUBJECTS - above Sea anemone, inset left baked bean sea squirt PICTURES: PAUL NAYLOR