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Tantulocarida is a highly specialised group of parasitic crustaceans that consists of about 33 species, treated as a subclass of the class Maxillopoda (copepods and barnacles). They are typically ectoparasites that infest copepods, isopods, tanaids, amphipods and ostracods. Members of this subclass are minute – less than in length and have a dramatic reduction in body form compared to other crustaceans, with an unsegmented sac-like thorax and a much reduced abdomen. One tantulocarid species, ''Tantulacus dieteri'', is the world's smallest arthropod, with a total body length of only . The tantulocarid life cycle is unique. It does not follow the usual moulting cycle of all crustaceans; instead, the mature adult actually develops within an attached parasitic tantulus larva. ==Classification== Five families are recognised: Basipodellidae Boxshall & Lincoln, 1983: *''Basipodella'' Becker, 1975 *''Hypertantulus'' Ohtsuka & Boxshall, 1998 *''Nipponotantulus'' Huys, Ohtsuka & Boxshall, 1994 *''Polynyapodella'' Huys, Møberg & Kristensen, 1997 *''Rimitantulus'' Huys & Conroy-Dalton, 1997 *''Serratotantulus'' Savchenko & Kolbasov, 2009 *''Stygotantulus'' Boxshall & Huys, 1989 Doryphallophoridae Huys, 1991: *''Doryphallophora'' Huys, 1990 *''Paradoryphallophora'' Ohtsuka & Boxshall, 1998 Microdajidae Boxshall & Lincoln, 1987: *''Microdajus'' Greve, 1965 *''Xenalytus'' Huys, 1991 Deoterthridae Boxshall & Lincoln, 1987: *''Amphitantulus'' Boxshall & Vader, 1993 *''Aphotocentor'' Huys, 1991 *''Arcticotantulus'' Kornev, Tchesunov & Rybnikov, 2004 *''Boreotantulus'' Huys & Boxshall, 1988 *''Campyloxiphos'' Huys, 1991 *''Coralliotantulus'' Huys, 1991 *''Cumoniscus'' Bonnier, 1903 *''Deoterthron'' Bradford & Hewitt, 1980 *''Dicrotrichura'' Huys, 1989 *''Itoitantulus'' Huys, Ohtsuka Boxshall & Itô, 1992 *''Tantulacus'' Huys, Andersen & Kristensen, 1992 Onceroxenidae Huys, 1991: *''Onceroxenus'' Boxshall & Lincoln, 1987 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tantulocarida」の詳細全文を読む スポンサード リンク
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