Saprosites japonicus is a species of beetle of the family Scarabaeidae. It is found in China (Guangdong, Sichuan, Yunnan), India (Sikkim), Japan (Hokkaido, Honshu, Shikoku, Kyushu, Nakanoshima, Takarajima, Amami-ôshima), Korea, Nepal, Bhutan, the Russian Far East, Taiwan, Indonesia (Sumatra, Bali), Malaysia (Peninsula, Sabah), Thailand and Vietnam.
Description Adults reach a length of about . They have a parallel-sided, moderately shining, black body.
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