Aquila (genus)

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Aquila
Temporal range: Middle Miocene to present
Aquila chrysaetos Flickr.jpg
Aquila chrysaetos
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Accipitriformes
Family: Accipitridae
Subfamily: Aquilinae
Genus: Aquila
Brisson, 1760
Type species
Falco chrysaetos
Linnaeus, 1758
Synonyms
  • 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".[1] 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.

Taxonomy and systematics[edit]

The genus Aquila was introduced by the French zoologist Mathurin Jacques Brisson in 1760 with the golden eagle (Aquila chrysaetos) as the type species.[2][3] 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).[4]

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.[5]

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.[6]

The spotted eagles Greater spotted eagle, Lesser spotted eagle, and Indian spotted eagle (previously Aquila clanga, A. pomarina, A. (p.) hastata) are thought to be genetically closer to Ictinaetus and Lophoaetus than to other Aquila species, and may be placed into a separate genus, Clanga.[4]

Members of Aquila (excluding those moved to Clanga and Hieraaetus, but including A. fasciata/spilogaster) share two deletions in the (nuclear) LDH gene, as well as similarities in mitochondrial cyt-B gene sequence, though one of these deletions is reverted in A. chrysaetos.[5]

Species[edit]

The genus Aquila contains 11 species:[7]

Common name Scientific name [a] IUCN Red List Status Distribution Picture
Status Trend Population[b]
Bonelli's eagle Aquila fasciata
(Vieillot, 1822)
LC IUCN[8] Decrease 20,000 - 49,999 Hieraaetus fasciatus area.PNG Bonelli's Eagle - Montsonis - Spain S4E8373 (24849913309).jpg
Cassin's hawk-eagle Aquila africana
(Cassin, 1865)[9]
LC IUCN[10] Decrease 670 - 6,700 Cassin's Hawk-Eagle - Ghana.jpg
African hawk-eagle Aquila spilogaster
(Bonaparte, 1850)
LC IUCN[11] Decrease Hieraaetus spilogaster distr.png African hawk eagle (Aquila spilogaster).jpg
Golden eagle Aquila chrysaetos
(Linnaeus, 1758)
LC IUCN[12] Steady 100,000 - 200,000 AquilaChrysaetosIUCNver2018 2.png GoldenEagle-Nova.jpg
Eastern imperial eagle Aquila heliaca
Savigny, 1809
VU IUCN[13] Decrease 2,500 - 9,999 AquilaHeliacaIUCNver2019 1.png Eastern Imperial Eagle cr.jpg
Spanish imperial eagle Aquila adalberti
C. L. Brehm, 1861
VU IUCN[14] Increase 970 Aquila adalberti distr.PNG Aquila adalberti.jpg
Steppe eagle Aquila nipalensis
(Hodgson, 1833)
EN IUCN[15] Decrease 50,000 - 75,000 AquilaNipalensis.png Steppe Eagle Portrait.jpg
Tawny eagle Aquila rapax
(Temminck, 1828)
VU IUCN[16] Decrease 100,000 - 499,999 AquilaRapaxIUCNver2019 1.png 2012-tawny-eagle-0.jpg
Verreaux's eagle Aquila verreauxii
Lesson, 1830
LC IUCN[17] Steady Aquila verreauxii distr.png Witkruisarend.jpg
Gurney's eagle Aquila gurneyi
Gray, 1860
NT IUCN[18] Decrease AquilaGurneyiWolf.jpg
Wedge-tailed eagle Aquila audax
(Latham, 1801)
LC IUCN[19] Increase AquilaAudaxIUCNver2019 1.png Aquila audax - Captain's Flat.jpg

Fossil record[edit]

Numerous fossil taxa of eagles have been described.[20][21] Many have been moved to other genera, but several appear to be correctly assigned to this genus:

Whether "Hieraaetus" edwardsi (Middle -? Late Miocene of SW Europe) belongs into Aquila or the hawk-eagles (if the latter are indeed distinct) is unclear. Its initial name, "Aquila" minuta Milne-Edwards, 1871, is preoccupied by a junior synonym of the booted eagle, A. minuta Brehm, 1831.

Not placed in Aquila anymore are:

"Aquila" danana (Snake Creek Late Miocene/Early Pliocene of Loup Fork, USA), occasionally placed in Geranoaetus or Buteo, was a bird of prey of unclear relationships.

Notes[edit]

  1. ^ A binomial authority in parentheses indicates that the species was originally described in a genus other than Aquila.
  2. ^ Estimate for the number of mature individuals in the wild.

References[edit]

  1. ^ Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 52. ISBN 978-1-4081-2501-4.
  2. ^ Brisson, Mathurin Jacques (1760). Ornithologie, ou, Méthode Contenant la Division des Oiseaux en Ordres, Sections, Genres, Especes & leurs Variétés (in French and Latin). Paris: Jean-Baptiste Bauche. Vol. 1, p. 28, Vol. 1, p. 419.
  3. ^ Mayr, Ernst; Cottrell, G. William, eds. (1979). Check-list of Birds of the World. Volume 1 (2nd ed.). Cambridge, Massachusetts: Museum of Comparative Zoology. p. 378.
  4. ^ a b Boyd, John Accipitriformes", Taxonomy in Flux Checklist.
  5. ^ a b Helbig, A.J.; Kocum, A.; Seibold, I. & Braun, M.J. "A multi-gene phylogeny of aquiline eagles (Aves: Accipitriformes) reveals extensive paraphyly at the genus level" (PDF). Science Direct, Journal of Molecular Phylogenetics and Evolution. Retrieved 2013-04-01.
  6. ^ See article Hieraaetus for details.
  7. ^ Gill, Frank; Donsker, David, eds. (2019). "New World vultures, Secretarybird, kites, hawks, eagles". World Bird List Version 9.1. International Ornithologists' Union. Retrieved 2 April 2019.
  8. ^ BirdLife International (2015). "Aquila fasciata". IUCN Red List of Threatened Species. Version 2014.3. International Union for Conservation of Nature. Retrieved 12 April 2015.
  9. ^ Helbig, AJ; Kocum, A; Seibold, I; Braun, MJ (2005). "A multi-gene phylogeny of aquiline eagles (Aves: Accipitriformes) reveals extensive paraphyly at the genus level" (PDF). Molecular Phylogenetics and Evolution. 35 (1): 147–164. doi:10.1016/j.ympev.2004.10.003.
  10. ^ "Aquila africana". The IUCN Red List of Threatened Species. International Union for Conservation of Nature and Natural Resources. Retrieved 31 October 2016.
  11. ^ BirdLife International (2012). "Aquila spilogaster". IUCN Red List of Threatened Species. Version 2016.2. International Union for Conservation of Nature. Retrieved 2 November 2016.
  12. ^ BirdLife International (2013). "Aquila chrysaetos". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 2013-11-26.
  13. ^ BirdLife International (2017). "Aquila heliaca". The IUCN Red List of Threatened Species. IUCN: e.T22696048A117070289. doi:10.2305/IUCN.UK.2017-3.RLTS.T22696048A117070289.en.
  14. ^ BirdLife International (2013). "Aquila adalberti". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  15. ^ BirdLife International (2015). "Aquila nipalensis". IUCN Red List of Threatened Species. Version 2015. International Union for Conservation of Nature. Retrieved 24 January 2016.
  16. ^ BirdLife International (2018). "Aquila rapax". IUCN Red List of Threatened Species. Version 2018.2. International Union for Conservation of Nature. Retrieved 17 December 2018.
  17. ^ BirdLife International (2016). "Aquila verreauxii". IUCN Red List of Threatened Species. IUCN. 2016: e.T22696067A95221980. doi:10.2305/IUCN.UK.2016-3.RLTS.T22696067A95221980.en. Retrieved 9 April 2017.CS1 maint: uses authors parameter (link)
  18. ^ BirdLife International (2012). "Aquila gurneyi". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  19. ^ BirdLife International (2012). "Aquila audax". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  20. ^ Brodkorb, Pierce (1964). "Catalogue of Fossil Birds: Part 2 (Anseriformes through Galliformes)". Bulletin of the Florida State Museum. 8 (3): 195–335.
  21. ^ a b Mlíkovský, Jirí (2002): Cenozoic Birds of the World, Part 1: Europe Archived 2011-03-07 at WebCite . Ninox Press, Prague, p. 194.
  22. ^ Boev, Z., 2013. Aquila kurochkini sp. n., a New Late Pliocene Eagle (Aves, Accipitriformes) from Varshets (NW Bulgaria). - Paleontological Journal, 2013, Vol. 47, No. 11, pp. 1344–1354. Pleiades Publishing, Ltd., 2013.
  23. ^ Salotti, Michelle; Bellot-Gourlet, Ludovic; Courtois, Jean-Yves; Dubois, Jean-Noël; Louchart, Antoine; Mourer-Chauviré, Cécile; Oberlin, Christine; Pereira, Elisabeth; Poupeau, Gérard; Tramoni, Pascal (2000). "La fin du Pléistocène supérieur et le début de l'Holocène en Corse: apports paléontologique et archéologique du site de Castiglione (Oletta, Haute-Corse)" [The end of the Late Pleistocene and the Early Holocene in Corsica: New paleontological and archaeological data from Castiglione deposit (Oletta, Haute-Corse)]. Quaternaire (English abstract) (in French). 11 (3): 219–230. doi:10.3406/quate.2000.1671.
  24. ^ Madagascar and other Islands. Human Settlers Invade Paradise Archived 2007-10-07 at the Wayback Machine. Endangered Species Handbook. Retrieved on 2013-04-17.