sea anemone


Also found in: Dictionary, Thesaurus, Wikipedia.

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
..... Click the link for more information.
) 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).
..... Click the link for more information.
, 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 ?
And while the gut tissue of a sea anemone might not look like a beating heart, it does undergo slow, rhythmic peristaltic waves of contraction, much like the human digestive system.
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.
Not many know that clown fish hide in sea anemones to protect themselves from danger.
Staining protocol for the histological study of sea anemones (Anthozoa: Actiniaria) with recommendations for anesthesia and fixation of specimens
A marked mirror (Figure 1A and 1B) was placed adjacent to the sea anemone host of each selected fish, then the diver (in all cases S.
Rodriguez has also found that in Antarctica there's an unusual number of sea anemone species that brood, or care for their eggs until they hatch.
Once the nets are emptied, Rodriguez reaches for sea anemones (uh-NEM-uhnees), relatives of jellyfish and coral.
By the end of my teen years I had the self-esteem of a sea anemone.
They see a starfish, a hermit crab, a sea anemone, and more, in a delightful shared adventure.
Haiti variety) tended to have a higher consumption rate of sea anemone than Lysmata sp.
The Fish and Game Commission voted in December to reject a petition by biotech entrepreneurs, making it the only state so far that has banned the sale of the tropical zebra fish infused with the red fluorescent gene of a sea anemone.