Aquila (genus)
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Aquila Temporal range: Middle Miocene to present |
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| Aquila chrysaetos | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Accipitriformes |
| Family: | Accipitridae |
| Subfamily: | Aquilinae |
| Genus: |
Aquila Brisson, 1760 |
| Species | |
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See text |
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| Synonyms | |
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Hieraaetus Kaup, 1844 |
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See text
Hieraaetus Kaup, 1844
and see text
Aquila is the genus of true eagles. The genus name is Latin for "eagle", possibly derived from aquilus, "dark in colour". It is often united with the buteos, sea eagles, and other more heavyset Accipitridae, but more recently they appear to be less distinct from the more slender accipitrine hawks than previously believed. Eagles are not a natural group, but denote essentially any bird of prey large enough to hunt sizeable (about 50 cm long or more overall) vertebrate prey.
Aquila belongs to a close-knit group of "typical" eagles including genera Hieraaetus, Lophaetus, Ictinaetus, Clanga, and the extinct Harpagornis. This group occurs as a clade within the larger group of "booted" eagles (tribe Aquilini or subfamily Aquilinae).
The plumage of the more basal members of the booted-eagle group, such as Spizaetus and Nisaetus, generally has barred underparts in adults, and is distinctly different in juveniles which have plain, pale underparts. In contrast, within the Aquila–Hieraaetus–Lophaetus clade, adults are generally dark, with juveniles more closely resembling the adults. Hieraaetus species have both dark and light (or "pied") morphs, with the latter having light, unbarred under-parts.
Research in molecular genetics found Aquila and Hieraaetus to be polyphyletic. Between 2005 and 2014, the British Ornithologists' Union included both Bonelli's and the booted eagle in Aquila. Also, Clements' Checklist merged all Hieraetus species into Aquila from 2001 to 2009. The current approach is to keep Hieraaetus as a separate genus, with Bonelli's eagle and the African hawk-eagle moved into Aquila and Wahlberg's eagle moved into Hieraaetus.
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