Oithona
Oithona is a planktonic crustacean genus found in marine, brackish, fresh water environments. Oithona has been described as the most ubiquitous and abundant copepod in the world's oceans. It was first described by Baird (physician)|Baird] in 1843 using the species Oithona plumifera as taxon type.
The following species are recognized:Oithona aculeata Farran, 1913Oithona alvarezi Lindberg, 1955Oithona amazonica Burckhardt, 1913Oithona aruensis Früchtl, 1923Oithona atlantica Farran, 1908Oithona attenuata Farran, 1913Oithona australis Nishida, 1986Oithona bjornbergae Ferrari F.D. & Bowman, 1980Oithona bowmani Rocha C.E.F., 1986Oithona brevicornis Giesbrecht, 1891Oithona colcarva Bowman, 1975Oithona cruralis Nishida, Tanaka & Omori, 1977Oithona davisae Ferrari F.D. & Orsi, 1984Oithona decipiens Farran, 1913Oithona dissimilis Lindberg, 1940Oithona erythrops Brady, 1915Oithona fallax Farran, 1913Oithona farrani Oithona flemingeri Oithona fonsecae Ferrari & Bowman, 1980Oithona fragilis Nishida, 1979Oithona frigida Giesbrecht, 1902Oithona gessneri Kiefer, 1954Oithona hamata Rosendorn, 1917Oithona hebes Giesbrecht, 1891Oithona horai Sewell, 1934Oithona linearis Giesbrecht, 1891Oithona longispina Nishida, Tanaka & Omori, 1977Oithona minuta Scott T., 1894Oithona minuta Krichagin, 1877Oithona nana Giesbrecht, 1893Oithona nishidai McKinnon, 2000Oithona oswaldocruzi Oliveira, 1945Oithona pacifica Oithona parvula Oithona plumifera Baird, 1843Oithona pseudofrigida Rosendorn, 1917Oithona pseudovivida Shuvalov, 1980Oithona pulla Oithona robertsoni McKinnon, 2000Oithona robusta Giesbrecht, 1891Oithona rostralis Nishida, Tanaka & Omori, 1977Oithona setigera Oithona similis Claus, 1866Oithona simplex Farran, 1913Oithona splendens Baird, 1843Oithona tenuis Rosendorn, 1917Oithona vivida Farran, 1913Oithona wellershausi Ferrari F.D., 1982Oithona abbreviata Oithona alia accepted as Oithona rigida Giesbrecht, 1896 accepted as Dioithona rigida Oithona canhanhae Oliveira, 1945 accepted as Oithona hebes Giesbrecht, 1891 Oithona challengeri Brady, 1883 accepted as Oithona setigera Oithona helgolandica accepted as Oithona similis Claus, 1866Oithona neotropica Herbst, 1967 accepted as Oithona oswaldocruzi Oliveira, 1945 Oithona oculata Farran, 1913 accepted as Dioithona oculata Oithona oligohalina Fonseca & Björnberg T.K.S., 1976 accepted as Oithona oswaldocruzi Oliveira, 1945 Oithona oraemaris Oliveira, 1946 accepted as Oithona hebes Giesbrecht, 1891 Oithona ovalis Herbst, 1955 accepted as Oithona hebes Giesbrecht, 1891 Oithona ovata Lindberg, 1950 accepted as Oithona attenuata Farran, 1913 Oithona pelagica Farran, 1908 accepted as Oithona setigera Oithona plumosa Lindberg, 1947 accepted as Oithona nana Giesbrecht, 1893 Oithona pygmaea Boeck, 1865 accepted as Oithona similis Claus, 1866 Oithona rigida Giesbrecht, 1896 accepted as Dioithona rigida Oithona sapucaiae Oliveira, 1945 accepted as Oithona hebes Giesbrecht, 1891 Oithona scriba accepted as Oithona plumifera Baird, 1843 Oithona sinensis Burckhardt, 1912 accepted as Limnoithona sinensis Oithona spinifrons Boeck, 1865 accepted as Oithona similis Claus, 1866Oithona spinirostris Claus, 1863 accepted as Oithona setigera Oithona spinulosa Lindberg, 1950 accepted as Oithona brevicornis Giesbrecht, 1891 Oithona tropica Wolfenden, 1906 accepted as ''Oithona setigera''