Tags: Crustacean.
Acartia simplex is a species of marine copepod belonging to the family Acartiidae. This species just under 1 mm in length is rather similar to Acartia ensifera but can be distinguished by the presence of spines on the dorsal part of the posterior body segment (metasome). Like A. ensifera it is found around the coasts of New Zealand mainly in estuarine habitats.