Rheiformes

Rheiformes; Temporal range: Eocene – Holocene, 40–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Greater rhea (Rhea americana)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Infraclass:	Palaeognathae
Clade:	Notopalaeognathae
Order:	Rheiformes; Forbes, 1884
Families
	Rheidae; †Opistodactylidae;

Rheiformes is an order that contains the family Rheidae (rheas).^[3] It is in the infraclass Paleognathae, which contains all ratites. Extant members are found in South America. While the IOC World Bird List and the Clements Checklist categorise Rheiformes as its own order,^[3]^[4] the BirdLife Data Zone includes rheas, along with ostriches, tinamous, cassowaries, emu, and kiwis, in the order Struthioniformes.^[5] Of the two extant species of rheas recognized by the IUCN Red List, as of 2022^[update], Rhea americana is listed as near threatened,^[6] while Rhea pennata is listed as least concern.^[7] From 2014 to 2022, the IUCN recognised Rhea tarapacensis as a separate species, and listed it as near threatened in its last assessment in 2020;^[8] in 2022, it was again recognised as a subspecies of R. pennata.^[7]^: Taxonomy

References

^ Kirwan, Guy M.; Korthals, Arne; Hodes, Carly E. (2 April 2021). "Greater Rhea (Rhea americana), version 2.0". In Keeney, B. K. (ed.). Birds of the World. Ithaca, New York, United States: Cornell Lab of Ornithology. doi:10.2173/bow.grerhe1.02.
^ "Rheiformes". Global Biodiversity Information Facility. Retrieved 30 November 2022.
^ ^a ^b Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (11 August 2022). "Ratites: Ostriches to tinamous". IOC World Bird List (version 12.2 ed.). Retrieved 29 November 2022.
^ Clements, James F.; Schulenberg, Thomas S.; Iliff, Marshall J.; Fredericks, Thomas A.; Gerbracht, Jeff A.; LePage, Denis; Billerman, Shawn M.; Sullivan, Brian L.; Wood, Christopher L. (25 October 2022). "The eBird/Clements checklist of Birds of the World" (v2022 ed.). Ithaca, New York, United States: Cornell Lab of Ornithology. Retrieved 29 November 2022.
^ "HBW and BirdLife Taxonomic Checklist". BirdLife Data Zone (version 6.0b ed.). BirdLife International. July 2022. Retrieved 29 November 2022.
^ BirdLife International. (2022). "Rhea americana". IUCN Red List of Threatened Species. 2022: e.T22678073A219615764. doi:10.2305/IUCN.UK.2022-2.RLTS.T22678073A219615764.en. Retrieved 7 July 2024.
^ ^a ^b BirdLife International. (2022). "Rhea pennata". IUCN Red List of Threatened Species. 2022: e.T22678081A217016710. doi:10.2305/IUCN.UK.2022-2.RLTS.T22678081A217016710.en. Retrieved 7 July 2024.
^ BirdLife International. (2020). "Rhea tarapacensis". IUCN Red List of Threatened Species. 2020: e.T22728206A177987446. doi:10.2305/IUCN.UK.2020-3.RLTS.T22728206A177987446.en. Retrieved 7 July 2024.

[1] Kirwan, Guy M.; Korthals, Arne; Hodes, Carly E. (2 April 2021). "Greater Rhea (Rhea americana), version 2.0". In Keeney, B. K. (ed.). Birds of the World. Ithaca, New York, United States: Cornell Lab of Ornithology. doi:10.2173/bow.grerhe1.02.

[2] "Rheiformes". Global Biodiversity Information Facility. Retrieved 30 November 2022.

[IOC_World_Bird_List-3] Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (11 August 2022). "Ratites: Ostriches to tinamous". IOC World Bird List (version 12.2 ed.). Retrieved 29 November 2022.

[4] Clements, James F.; Schulenberg, Thomas S.; Iliff, Marshall J.; Fredericks, Thomas A.; Gerbracht, Jeff A.; LePage, Denis; Billerman, Shawn M.; Sullivan, Brian L.; Wood, Christopher L. (25 October 2022). "The eBird/Clements checklist of Birds of the World" (v2022 ed.). Ithaca, New York, United States: Cornell Lab of Ornithology. Retrieved 29 November 2022.

[5] "HBW and BirdLife Taxonomic Checklist". BirdLife Data Zone (version 6.0b ed.). BirdLife International. July 2022. Retrieved 29 November 2022.

[6] BirdLife International. (2022). "Rhea americana". IUCN Red List of Threatened Species. 2022: e.T22678073A219615764. doi:10.2305/IUCN.UK.2022-2.RLTS.T22678073A219615764.en. Retrieved 7 July 2024.

[RedListRheaPennata-7] BirdLife International. (2022). "Rhea pennata". IUCN Red List of Threatened Species. 2022: e.T22678081A217016710. doi:10.2305/IUCN.UK.2022-2.RLTS.T22678081A217016710.en. Retrieved 7 July 2024.

[8] BirdLife International. (2020). "Rhea tarapacensis". IUCN Red List of Threatened Species. 2020: e.T22728206A177987446. doi:10.2305/IUCN.UK.2020-3.RLTS.T22728206A177987446.en. Retrieved 7 July 2024.

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