A new species of Arenosetella Wilson, 1932 from Turkey with notes on the genus (Copepoda, Harpacticoida, Ectinosomatidae)

A new species of the genus Arenosetella CB Wilson, 1932 is described from specimens that were collected from the Mediterranean coast of Turkey. The new species is closely related to A. fimbricaudata McLachlan & Moore, 1978, A. germanica Kunz, 1937 and A. kaiseri Lang, 1965 within the 21 species/subspecies of the genus by having five setae at the exopod of the first and the second swimming leg, six setae at the terminal exopod segment of the fourth swimming leg, four setae at the terminal segment of the endopod of the first to fourth swimming legs and four marginal and one surface seta at the exopod of the fifth swimming leg of female. It can be differentiated from all of the species above by the loss of the inner seta at the first segment of the exopod of the second and the third swimming legs. As the diagnosis of the genus was not up to date and did not cover all of the species, a revised and extended diagnosis is provided. The antenna of A. bassantae Mitwally and Montagna 2001 was re-examined from the holotype, as the given armature in the original description was unusual for the basic pattern of the family, an amended description and drawing are presented herein.