Amsterdam Expeditions to the West Indian Islands, Report 54. Zwei neue Metacyclops (Crustacea Copepoda) von den Westindischen Inseln Barbados und Aruba: M. agnitus n. sp. und M. mutatus n. sp., sowie ein Bestimmungsschlüssel für das genus

In wells of the islands of Barbados and Aruba (West Indies) two new species of Metacyclops were found. One, belonging to the minutus-group, is described as Metacyclops agnitus n. sp. and is closely related to Metacyclops minutus (Claus, 1863). In absence of complete descriptions of M. minutus, especially concerning absolute measurements, these are completed with observations on a West-German population. The other species, called Metacyclops mutatus n. sp., may have evolved from mendocinus-like ancestors, but differs obviously in comparison with the morphologically similar species M. aequatorialis Dussart, 1977 and M. chelazzi Dumont, 1981. A key for Metacyclops is provided, mainly based on the literature, as an aid for future investigations.