Monoblastus clauseni is a species of parasitoid wasp belonging to the family Ichneumonidae.
It was first described in 1930 as Polyrhysia clauseni by the Japanese entomologist, Toichi Uchida, from a specimen collected in Korea in June 1928 by C.P. Clausen, whom the species epithet honours.
in 1955, Uchida described the species, Tryphon satoi, which Kasparyan synonymised in 1973 to Monoblastus clauseni.Kasparyan DR (1973) Fauna of the USSR Hymenoptera Vol.III Number 1. Ichneumonidae (Subfamily Tryphoninae) Tribe Tryphonini. Nauka Publishers, Leningrad. 319 pp. In the same article Uchida also described Tryphon clauseni which was synonymised in 1965 with Tryphon satoi by Townes, Momoi & Townes.Townes, H. Momoi, S., and Townes, M. 1965. A catalog and reclassification of Eastern Palearctic Ichneumonidae. Mem. Amer. Ent. Inst. 5: 1-661. Japanese taxonomists give Tryphon (Stenocrotaphon) nagahamensis Uchida, 1930 as the accepted name.
The wasp is native to the Korean peninsula, where the type specimen was collected, and if Kasparyan's synonymisation is accepted, it is also found in Russia.
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