The millipede genus Haplogonosoma BROLEMANN, 1916, is a senior synonym of Sphalmatogonus JEEKEL, 1980 (syn. n.), and it seems to actually comprise only two species, H. implicatum BROLEMANN, 1916 (type species), from central Honshu to Kunashir Island, Kuriles, and H. silvestre TAKAKUWA, 1942 (=H. silvestre dichotomum TAKAKUWA, 1942, =Sphalmatogonus carli JEEKEL, 1980, both syn. n.), at least from Kyushu and ?Sumatra. The systematic position of Haplogonosoma is discussed, and the genus is formally allocated within the chiefly Papuan tribe Eustrongylosomatini.
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