Selenaletes scopaeus, a new genus and species of helaletid, is based upon a lower jaw fragment, probably from Lost Cabin beds, Wind River Basin, Wyo. Other material from Wyoming and Colorado provides knowledge of DP 4 and P 4 - M 3 . Generic diagnosis is: tiny, with relatively unmolariform premolars, lower molars similar to those of Heptodon except much smaller and with M 3 smaller than M 2 and lacking a hypoconulid. Selenaletes apparently is the smallest known perissodactyl.

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