Avrainvillea is a genus of green algae in the family Dichotomosiphonaceae.
Avrainvillea is a green siphonous marine macroalgal species. In the tropical species the dichotomously and branched filaments are generally united.
The genus has a worldwide tropical and tropical distribution.
The species occur from the intertidal to 60m.
Avrainvillea erecta was reported to have strong hemagglutination activity. In addition, the chloroform fraction of a methanol extract of Avrainvillea erecta exhibited hydrogen peroxide scavenging activity as strong as that shown by gallic acid.
Eight new species are listed and described.