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Mammalia - Artiodactyla - Merycoidodontidae
It was recombined as Pithecistes heterodon by Cope (1884); it was synonymized subjectively with Cyclopidius simus by Loomis (1925); it was synonymized subjectively with Leptauchenia decora by CoBabe (1996); it was synonymized subjectively with Sespia nitida by Lander (1998); it was recombined as Sespia heterodon by Schultz and Falkenbach (1968), Hoffman and Prothero (2004) and Stevens and Stevens (2007).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.