蟹奴科（學名：Sacculinidae）為根頭下綱的一個科。蟹奴是一類專門以蟹為寄主的寄生生物。蟹奴是卵生生物，受精後的蟹奴卵在海水中自行發育成為幼體，幼體的蟹奴非常小，隨波逐流，當它們遇到螃蟹就會寄生在蟹的身上。只有雌性蟹奴才會寄生，而且雌性蟹奴只選擇雄性螃蟹寄生。
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本科包括以下屬：[1][2]
- Drepanorchis Boschma, 1927
- Heterosaccus Smith, 1906
- Loxothylacus Boschma, 1928
- Loxothylacus amoenus Boschma, 1940
- Loxothylacus aristatus Boschma, 1931
- Loxothylacus armatus Boschma, 1949
- Loxothylacus auritus Boschma, 1954
- Loxothylacus bicorniger Boschma, 1933
- Loxothylacus brachythrix Boschma, 1940
- Loxothylacus caribaeus Boschma, 1974
- Loxothylacus carinatus (Kossmann, 1872)
- Loxothylacus corculum (Kossmann, 1872)
- Loxothylacus desmothrix Boschma, 1931
- Loxothylacus echioides Boschma, 1940
- Loxothylacus engeli Boschma, 1968
- Loxothylacus ihlei Boschma, 1949
- Loxothylacus kossmanni Boschma, 1955
- Loxothylacus longipilus (Boschma, 1933)
- Loxothylacus musivus Boschma, 1940
- Loxothylacus omissus Boschma, 1957
- Loxothylacus panopaei (Gissler, 1884)
- Loxothylacus panopei[3]
- Loxothylacus perarmatus Reinhard & Reischman, 1958
- Loxothylacus sclerothrix Boschma, 1933
- Loxothylacus setaceus Boschma, 1931
- Loxothylacus spinulosus Boschma, 1928
- Loxothylacus strandi Boschma, 1936
- Loxothylacus texanus Boschma, 1933
- Loxothylacus tomentosus Shiino, 1943
- Loxothylacus torridus Boschma, 1940
- Loxothylacus variabilis Boschma, 1940
- Loxothylacus vepretus Boschma, 1947
- Ptychascus Boschma, 1933
- 蟹奴屬 Sacculina Thompson, 1836
- Sesarmaxenos Annandale, 1911
Chan, Benny K. K.; Dreyer, Niklas; Gale, Andy S.; Glenner, Henrik; et al. The evolutionary diversity of barnacles, with an updated classification of fossil and living forms. Zoological Journal of the Linnean Society. 2021. doi:10.1093/zoolinnean/zlaa160 
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