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:
- Calanus aculeatus <small>Brady, 1918</small>
- Calanus agulhensis <small>De Decker, Kaczmaruk & Marska, 1991</small>
- Calanus chilensis <small>Brodsky, 1959</small>
- Calanus dorsalis <small>(Rafinesque, 1817)</small>
- Calanus euxinus <small>Hulsemann, 1991</small>
- Calanus finmarchicus <small>(Gunnerus, 1770)</small>
- Calanus glacialis <small>Jaschnov, 1955</small>
- Calanus helgolandicus <small>(Claus, 1863)</small>
- Calanus hyperboreus <small>Krøyer, 1838</small>
- Calanus jashnovi <small>Hulsemann, 1994</small>
- Calanus marshallae <small>Frost, 1974</small>
- Calanus pacificus <small>Brodsky, 1948</small>
- Calanus propinquus <small>Brady, 1883</small>
- Calanus simillimus <small>Giesbrecht, 1902</small>
- Calanus sinicus <small>Brodsky, 1962</small>
- Calanus torticornis <small>(Brady, 1918)</small>
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