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Crotalinae (pit viper)
Reptilia - Squamata - Viperidae
It was reranked as the family Crotalidae by Cope (1871), Cope (1875), Zittel (1890) and Olson (1940).
It was assigned to Solenoglypha by Cope (1871) and Cope (1875); to Ophidia by Zittel (1890) and Olson (1940); and to Viperidae by Oppel (1811), Kuhn (1946), Parmley and Holman (2007) and Parmley and Hunter (2010).
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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.