A rostrum from the Chadronian of Pipestone Springs, Montana, is referred to Micropternodus borealis Matthew. Kentrogomphios strophensis White is a junior synonym of M. borealis, as may be the Cryptoryctes kayi Reed humeri. Micropternodus cannot be placed in the Talpidae, Solenodontidae, Apternodontidae, or the Nyctitheriidae, as has been variously suggested by previous authors, but rather belongs in a poorly-known complex of late Cretaceous and early Tertiary insectivores represented by Gypsonictops, Scenopagus, and the Geolabidinae.

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