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Genus Semnornis
Prong-billed Barbet - It often has been placed with the other barbets in the Capitonidae. However, DNA studies have confirmed that this arrangement is paraphyletic; New World Barbets are more closely related to toucans than they are to Old World barbets. As a result, the barbet lineages are considered distinct families; the Prong-billed Barbet and the Toucan Barbet now form a separate family, Semnornithidae.
Toucan Barbet - In the past, it has been grouped with the other barbets in the Capitonidae. However, DNA studies have confirmed that this arrangement is paraphyletic; the New World barbets are more closely related to the toucans than they are to the Old World barbets. As a result, the barbet lineages are now considered to be distinct families, and the Toucan Barbet, together with the Prong-billed Barbet, is now placed into a separate family, Semnornithidae.