Xanthocalanus medius is a species of copepod, which was first described in 1937 by the Japanese zoologist, Otohiko Tanaka.Tanaka, O. (1937). Copepods from the deep water of Suruga Bay. Japanese Journal of Zoology, 7 (2) 251-271.
The type specimen was found in the deep waters of Suruga Bay. It has also been found in the seas off the Korean Peninsula.
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