Acartia clausi is a species of marine copepod belonging to the family Acartiidae. This species was previously thought to have a worldwide distribution but recent research  has restricted its range to coastal regions of the north-east Atlantic Ocean as far north as Iceland, the Mediterranean Sea and the Black Sea, with specimens from other regions assigned to different species.
At just over 1 mm in length, this is a generally larger animal than its closest congeners. It can also be distinguished by the row of large spines at the rear margin of the body segment known as the metasome.
- Bradford, Janet (1976). "Partial Revision of the Acartia Subgenus Acartiura (Copepoda: Calanoida: Acartiidae)". New Zealand Journal of Marine and Freshwater Research 10 (1): 159–202. doi:10.1080/00288330.1976.9515606. http://www.tandfonline.com/doi/abs/10.1080/00288330.1976.9515606.
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