Bougainvillia is a genus of hydroids in the family Bougainvilliidae in the class Hydrazoa. Members of the genus are characterised by having the marginal tentacles of their medusae arranged in four bundles. Some species are solitary and others are colonial but all are filter feeders. They are found in the Southern Ocean, having a circumpolar distribution, but some species also occur in the Northern Hemisphere, possibly travelling there as polyps on the hulls of ships. Species The World Register of Marine Species lists the following species: Bougainvillia aberrans Calder, 1993 Bougainvillia aurantiaca Bouillon, 1980 Bougainvillia balei Stechow, 1924 Bougainvillia bitentaculata Uchida, 1925 Bougainvillia bougainvillei (Brandt, 1835) Bougainvillia britannica (Forbes, 1841) Bougainvillia carolinensis (Mccrady, 1859) Bougainvillia chenyapingii Xu, Huang & Guo, 2007 Bougainvillia crassa Fraser, 1938 Bougainvillia dimorpha Schuchert, 1996 Bougainvillia frondosa Mayer, 1900 Bougainvillia fulva Agassiz & Mayer, 1899 Bougainvillia inaequalis Fraser, 1944 Bougainvillia involuta Uchida, 1947 Bougainvillia lamellata Xu, Huang & Liu, 2007 Bougainvillia longicirra Stechow, 1914 Bougainvillia longistyla Xu & Huang, 2004 Bougainvillia macloviana Lesson, 1836 Bougainvillia meinertiae Jäderholm, 1923 Bougainvillia multitentaculata Förster, 1923 Bougainvillia muscoides (Sars, 1846) Bougainvillia muscus (Allman, 1863) Bougainvillia niobe Mayer, 1894 Bougainvillia paraplatygaster Xu, Huang & Chen, 1991 Bougainvillia platygaster (Haeckel, 1879) Bougainvillia principis (Steenstrup, 1850) Bougainvillia pyramidata (Forbes & Goodsir, 1853) Bougainvillia reticulata Xu & Huang, 2006 Bougainvillia rugosa Clarke, 1882 Bougainvillia superciliaris (L. Agassiz, 1849) Bougainvillia vervoorti Bouillon, 1995 References Bougainvilliidae Hydrozoan genera