Calanus is a genus of marine copepod in the family Calanidae (Order Calanoida). The genus was split in 1974, with some species being placed in a new genus, Neocalanus. The following species are recognised:
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Calanus aculeatus Brady, 1918
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Calanus agulhensis De Decker, Kaczmaruk & Marska, 1991
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Calanus chilensis Brodsky, 1959
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Calanus dorsalis (Rafinesque, 1817)
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Calanus euxinus Hulsemann, 1991
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Calanus finmarchicus (Gunnerus, 1770)
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Calanus glacialis Jaschnov, 1955
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Calanus helgolandicus (Claus, 1863)
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Calanus hyperboreus Krøyer, 1838
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Calanus jashnovi Hulsemann, 1994
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Calanus marshallae Frost, 1974
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Calanus pacificus Brodsky, 1948
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Calanus propinquus Brady, 1883
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Calanus simillimus Giesbrecht, 1902
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Calanus sinicus Brodsky, 1962
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Calanus torticornis (Brady, 1918)