Semanotus japonicus is a species of beetle in the family Cerambycidae.Bezark, Larry G. A Photographic Catalog of the Cerambycidae of the World . Retrieved on 22 May 2012.
The beetle occurs naturally on Honshu, Shikoku, Sado Island, Oki Island and Yaku Island in Japan. Its main host tree is the Japanese cedar, Cryptomeria japonica.
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