G.R. Gray, 1859
Both species are endemic to New Guinea. Genetic research has found that they are closely related to the Australian endemic square-tailed kite (Lophoictinia isura) and black-breasted buzzard (Hamirostra melanosternon), all sharing a 3-base-pair deletion in the RAG-1 gene. The four species form a monophyletic clade sister to Aviceda within the subfamily Perninae. It has been proposed that they could be united into a single genus, Hamirostra having precedence.
- "ITIS Report: Henicopernis". Integrated Taxonomic Information System. Retrieved 5 February 2010.
- Barrowclough, George F.; Groth, Jeff G.; Lai, Jonas E.; Tsang, Susan M. (March 2014). "The Phylogenetic Relationships of the Endemic Genera of Australo-Papuan Hawks". Journal of Raptor Research. 48 (1): 36–43. doi:10.3356/JRR-13-33.1. (open access)
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