''Acartia lefevreae'' is a species of

copepod Copepods (; meaning "oar-feet") are a group of small crustaceans found in nearly every freshwater and saltwater habitat (ecology), habitat. Some species are planktonic (inhabiting sea waters), some are benthos, benthic (living on the ocean floor) ...

belonging to the family

Acartiidae Acartiidae is a family of calanoid copepods distinguishable by the rostral margin not being extended. They are epipelagic, plankton Plankton are the diverse collection of organisms found in Hydrosphere, water (or atmosphere, air) that are u ...

. This species was discovered when specimens previously identified as ''

Acartia clausi ''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-eastern Atlan ...

'' were examined and found to belong to a separate species. Its range overlaps with that of ''A. clausi'', being found in the western Mediterranean and the north east Atlantic as far north as the English Channel, but it tends to be found in more brackish habitats such as estuaries. This species is generally similar to ''A. clausi'' but is usually noticeably smaller (total length 0.8–0.9 mm) and differs in the arrangement and size of the spines on the back of the posterior body segment (metasome).

References

Calanoida Crustaceans described in 1976 {{copepod-stub