Colpomenia sinuosa, commonly named the oyster thief or sinuous ballweed, is a brown algae species in the genus Colpomenia. It is the type species of its genus and is widespread in tropical to temperate zones around the world.
It is superficially similar to the Colpomenia peregrina species and in older texts, such as Knight and Parke (1931), C. peregrina is referred to as C. sinuosa.
Colpomenia sinuosa contains the C6-C4-C6 phenolic compound .Colpol, a New Cytotoxic C6-C4-C6 Metabolite from the Alga Colpomenia sinuosa. Dalia Green, Yoel Kashman and Ahron Miroz, J. Nat. Prod., 1993, volume 56, issue 7, pages 1201–1202,
Distribution This species is common in the intertidal and on reef flats, often growing on other algae or rocky substrates. In Hawaiʻi it is found from the mid intertidal to about 20m depth. It can be found in New Zealand in the northeastern coasts of the North Island, the Kermadec Islands, and the Marlborough Sounds.
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