Invalid names: Brachymeryx feliceps Cope 1877 [synonym], Cyclopidius emydinus Cope 1884 [synonym], Cyclopidius incisivus Scott 1893 [synonym], Cyclopidius simus Cope 1877 [synonym], Hadroleptauchenia extrema Schultz and Falkenbach 1968 [synonym], Hadroleptauchenia shanafeltae Schultz and Falkenbach 1968 [synonym], Leptauchenia densa Loomis 1925 [synonym], Leptauchenia margeryae Schultz and Falkenbach 1968 [synonym], Pseudocyclopidius frankforteri Schultz and Falkenbach 1968 [synonym]