COLDWATER MARINE AQUATICS

Moonglow Anemone (Anthopleura artemisia)

Coldwater Marine Aquatics recommends you keep these animals in 55F-60F water.

Typically lives partly buried in sand or shells but base of column is attached to a rock under the sediment.  No acontia.  Tubercles and symbionts are restricted to the upper two thirds of the column (symbionts are also in tentacles) so lower part of column is smooth and white or pink.  Oral disk may be bright pink, orange, or green.  Tentacles may be solidly colored or banded, and may be red, white, black, blue, gray, brown, or green (in SE Alaska they are usually green).  The bands on tentacles (if present) are usually white.  The margins of the oral disk contain white spherules for fighting, as do the other Anthopleura species (these spherules are often hard to see).

Habitat:  Open coast and (more often) in protected bays, prefers habitats with rocks or cobble buried in sand.

Biology/Natural History:  Normally only the tentacles and oral disk are exposed, with the rest of the anemone buried in the sediment.  This species is capable of greatly elongating.  At low tide the anemone may withdraw below the surface of the sediment.  Sometimes they live in holes made by boring clams.  Individuals are solitary as in A. xanthogrammica, but they can divide asexually by longitudinal fission as in A. elegantissima.  They will attack Kokomo other individuals who are nearby using their special white spherule tentacles.  I find this species much less commonly than the two other species.  Some references say they contain algal symbionts, but some recent information suggests that they do not.  In British Columbia this species has been observed feeding on spawned herring eggs. 
Types of cnidae in A. artemisia:  Spirocysts, atrichs, basitrichs, and microbasic p-mastigophores.

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