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Description:
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Original description As Actinia quadricolor, from specimens collected in the Red Sea, near Suez
Diagnostic field characters Each long (to 100 mm) brown tentacle usually with bulb at or somewhat below end; tip of tentacle red (rarely blue), equator of bulb white. Bulb seems to be related to presence of fish, and can disappear; tentacle lacking a bulb has white ring where equator would form. Tentacles without bulbs are blunt-ended. As a rule, in shallow water (e.g. on tops of reefs) polyps small (oral disc diameter 50 mm), clustered together in crevices or adjacent on coral branches, so that tentacles are confluent, forming extensive field; in deep water (e.g. on reef slopes) polyps solitary, large (to 400 mm diameter), with base anchored in deep hole.
Details Animal commonly attached deeply in crevice or hole so that only emergent tentacles visible. Column without verrucae; usually brown, sometimes reddish or greenish; gradually flared from small pedal disc. Oral disc same brown colour as tentacles. Tentacles can collapse when disturbed, appear gray-green. The most numerous host actinian, widespread geographically and abundant locally.
Similar species The smooth column is unique among symbiotic sea anemones, as are the bulbed tentacles.
Distribution Micronesia and Melanesia to East Africa and the Red Sea, and from Australia to Japan
Fish A. akindynos, A. allardi, A. bicinctus, A. chrysopterus, A. clarkii, A. ephippium, A. frenatus, A. mccullochi, A. melanopus (primarily clustered form), A. omanensis, A. rubrocinctus, A. tricinctus, Premnas (solitary form only)
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Keywords:
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Bulb-Tip Sea Anemone
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Administrator
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Posts: 665
Registered: March 2001
Location: Abingdon,MD
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