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Anthopleura elegantissima

(Aggregating Anemone)

Common Names

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Common Names in English:

Aggregating Anemone, Clonal Anemone

Description

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Physical Description

Species Anthopleura elegantissima

Cylindrical. The column is pale gray-green to white and twice as long as wide when completely extended; pale, variously colored tentacles with pink, lavender, or blue tips , in 5 rings around oral disk and are numerous , thick, and pointed . This species has a ring of white knobs, called acrorhagia, just outside their ring of tentacles. The acrorhagia are loaded with stinging cells and are used for fighting other anemones (picture). The column is covered with vertical rows of adhesive tubercles called verrucae (picture). One can distinguish from A. xanthogrammica by A. elegantissima's smaller size, their branched verrucae, which are in rows in this species, by their colored tentacles, and by the stripes on the oral disk, plus A. xanthogrammica does not live in clonal aggregations (though individuals may be quite close together).[1]

Size/Age/Growth

Aggregating individuals can be up to 6 cm high on their column and 8 cm wide. Solitary individuals, (now called A. sola) can be larger than those, up to 25 cm wide.[1]

Habitat

Live in the intertidal zone.

Ecology: Background color is due in part to zooxanthellae and zoochlorellae living symbiotically in the gastrodermal layer. (see below photo) Both are able to live in the anemone at the same time. They are able to transfer carbon to their host, the anemone. Its possible that the anemone can control the numbers of algal cells that it has by expelling them in a bolus of mucus . The species can handle a high range of temperatures , but the higher temperatures do affect the number of symbiotic algae. Tend to eat barnacle molts , dead debris from plankton , and mussels that have fallen off the overhead rocks. Anemones of this species frequently divide asexually by expanding the base of their column in two directions until they tear in half (picture). Large clusters , or aggregations, of clonally related anemones come to dominate areas of the intertidal in this way (picture). The aggregating anemones have an aggressive behavior towards other anemones that are not clones of themselves, (see photo below) and maintain anemone-free areas between clones (photo). They do sexually reproduce to disperse to new habitats . The verrucae frequently are holding bits of shell or gravel (picture) which is thought to provide some protection from ultraviolet light and/or reduce desiccation. Predators include the seastar Dermasterias imbricata.[1]

This anemone may harbor either zooxanthellae (dinoflagellate) or zoochlorellae (chlorophyte) intracellular symbionts . In California, the zooxanthellae may be either Symbiodinium californium or S. muscatinei. In Oregon and Washington the only zooxanthellae symbionts are S. muscatinei. Anemones with zooxanthellae have been observed from Baja California to SE Alaska, but are more common from Washington south. Anemones with zoochlorellae occur from Cape Blanco, Oregon north at least to Vancouver Island. The zoochlorella has recently been placed in Class Trebouxiophyceae. In areas where both symbionts occur, anemones with zooxanthellae can be found throughout the intertidal but favor the upper levels, while anemones with zoochlorellae are primarily found in the lower intertidal or in shaded areas.[1]

Biology

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Diet

[Migration]

Taxonomy

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Unambiguous Synonyms

  1. Anthopleura Elegantissima Solitary
  2. Bunodactis elegantissima (Brandt 1835)
  3. Bunodes californica Fewkes, 1889
  4. Cribrina elegantissima (Brandt)

Notes

Name Status: Accepted Name . Latest taxonomic scrutiny: Fautin D.G., 15-Oct-2001.

Similar Species

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It is similar to Anthopleura xanthogrammica, which is all green. A. elegantissima almost always have pinkish tips on their tentacles, and in the Pacific Northwest are usually a bit smaller in size. Anthopleura artemisia has verrucae on only the top 2/3 of its column and usually lives mostly buried in sand. Anthopleura sola, which was formerly known as the solitary form of A. elegantissima, is very similar except that it is solitary and usually larger. It was distinguished from A. elegantissima by molecular means. (Ref. 109953)

Members of the genus Anthopleura

There are approximately 54 species in this genus:

A. sola · A. africana · A. anjunae · A. anneae · A. artemisia (Burrowing Green Anemone) · A. asiatica · A. atodai · A. aureoradiata · A. ballii · A. buddemeieri · A. carneola · A. cascaia · A. chinensis · A. dixoniana · A. dowii · A. elatensis · A. elegantissima (Aggregating Anemone) · A. sola · A. foxi · A. gelam · A. handi · A. handi · A. handi · A. incerta · A. inconspicua · A. insignis · A. japonica · A. kohli · A. krebsi (Rock Anemone) · A. kurogane · A. listeri · A. mariscali · A. michaelseni · A. midori · A. minima · A. mortenseni · A. mortoni · A. nigrescens · A. orientalis · A. pacifica · A. panikkarii · A. qingdaoensis · A. rosea · A. rubripunctata · A. sola (Solitary Anemone) · A. stellula · A. texaensis · A. thallia · A. varioarmata · A. xanthogrammica (Giant Green Sea Anemone) · A. sola · A. michaelseni · A. anneae · A. michaelseni

More Info

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Further Reading

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Notes

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Contributors

Identifiers

Footnotes

  1. Cowles, Dave. Key to Invertebrates Found At or Near The Rosario Beach Marine Laboratory (a campus of Walla Walla University) Fidalgo Island, Anacortes, WA May 2009. [back]
Last Revised: 2009-06-17