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Mammalia - Helohyidae
It was corrected as Achaenodon by Peterson (1919), Gazin (1955), Carroll (1988), McKenna and Bell (1997) and Spaulding et al. (2009).
It was assigned to Achaenodontidae by Peterson (1919); to Helohyinae by Gazin (1955) and Carroll (1988); to Helohyidae by Cope (1873) and McKenna and Bell (1997); and to Cetancodontamorpha by Spaulding et al. (2009).
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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.