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Description:
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Original description As Discosoma malu, from specimens collected at Mer, in the Torres Straits
Diagnostic field characters Tentacles sparse, stubby (rarely to 40 mm long), of variable length even within one radial row, commonly magenta-tipped. Oral disc lies at surface of sediment in which delicate column is burrowed. Column commonly pale cream or yellow colour, may have splotches of deep yellow or orange.
Details Tentacles arise from brown or purplish (rarely bright green) oral disc as much as 200 mm in diameter that may have white radial markings; evenly tapered to point or slightly inflated in middle; lower part same colour as oral disc, but upper portion may have several white rings or green end. Column very thin in expansion; upper part violet-brown (due to zooxanthellae) with longitudinal rows of adhesive verrucae. Anemones can retract completely into sediment; most common in shallow, quiet waters.
Similar species Macrodactyla doreensis, Heteractis aurora and H. crispa also live burrowed into sediment. The columns of all four species may have red or yellow blotches; that of H. crispa is much firmer than that of H. malu (which is similar to that of H. aurora). In contrast to animals of the other three species, H. malu has relatively short tentacles, typically of variable length; tentacles of the other two species of Heteractis may also be magenta-tipped. Tentacles of H. crispa may contract in the absence of a fish, but H. malu has fewer tentacles per radial row; tentacles of H. aurora may be similarly sparse, but have swellings at intervals.
Distribution: Scattered localities from the Hawaiian Islands to Australia and northwards to Japan
Fish A. clarkii
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Keywords:
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Delicate Sea Anemone
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