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We had no chance to examine this large and very soft anemone, but its whole exterior is in a close agreement with recently published description of the specimens of Ptychodactis patula from North Pacific, so, we think that the specimens on the photos possibly belong to this species.
Update: in September 2010 this Aleutian anemone was described as a new species, distinct from P. patula and its current valid name is Ptychodactis aleutiensis
[see Eash-Loucks, Wendy E. , Jewett, Stephen C. , Fautin, Daphne G. , Hoberg, Max K. and Chenelot,
Heloise (2010) Ptychodactis aleutiensis, a new species of ptychodactiarian sea anemone (Cnidaria: Anthozoa: Actiniaria) from the Aleutian Islands, Alaska, Marine Biology Research, 6: 6, 570 - 578]
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