Mesacmaea
''Mesacmaea'' is a genus of sea anemone in the family Haloclavidae. Members of this genus typically burrow into soft substrates. The only part of the animal that is normally visible is the oral disc and tentacles which lie flat on the sand in a star shape.Family Haloclavidae
Marine Species Identification Portal. Retrieved 26 October 2018.

Species

The following species are listed by the

Mesacmaea Mitchellii
''Mesacmaea mitchellii'' is a species of sea anemone in the family Haloclavidae. It is found in the northeastern Atlantic Ocean and the Mediterranean Sea where it burrows in soft sediment. Taxonomy This species was first described in 1853 by the British naturalist Philip Henry Gosse as ''Ilyanthus mitchellii''. In 1881, the Italian zoologist Angelo Andres described a new species of sea anemone, ''Mesacmaea stellatus'', and erecting the genus ''Mesacmaea'' to accommodate it. Since then, ''Mesacmaea stellatus'' has been synonymised with ''Ilyanthus mitchellii'', the species becoming ''Mesacmaea mitchellii''. Two other species from the genus '' Ilyanthus'' have also been transferred to the genus ''Mesacmaea''. Description ''M. mitchellii'' is a robust and distinctive burrowing sea anemone. The column is pear-shaped with a rounded base, and is divided into a scapus, the main part of the column, and a scapulus, a smooth retractile region; the physa, or basal region, is able to adhere ...
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