Neotype designation of Crangon affinis (Decapoda, Caridea, Crangonidae)

In spite of its ecological and commercial significance, the taxonomy of the Crangon affinis complex has been much confused and requires a thorough rev ision. The specimens from Japanese waters which were previously referred to C. affinis or other closely related taxa have been reexamined. The type ma terial of C. affinis is no longer extant, and a specimen from Yokosuka, Jap an, referred to C. vulgaris by Bate (1888), has been selected as a neotype of C. affinis. It has been shown that C. consobrinus De Man is a junior sub jective synonym of C. affinis. As a first step for a revision of Crangon in Far Eastern seas, the neotype is described in detail with figures.