Rheiformes Explained

Rheiformes is an order that contains the family Rheidae (rheas).[1] 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,[1] [2] the BirdLife Data Zone includes rheas, along with ostriches, tinamous, cassowaries, emu, and kiwis, in the order Struthioniformes.[3] Of the two extant species of rheas recognized by the IUCN Red List,, Rhea americana is listed as near threatened,[4] while Rhea pennata is listed as least concern.[5] 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;[6] in 2022, it was again recognised as a subspecies of R. pennata.[5]

Notes and References

  1. Web site: IOC World Bird List. Ratites: Ostriches to tinamous. 2022-11-29. 11 August 2022. version 12.2. Frank. Gill. David. Donsker. Pamela. Rasmussen.
  2. Web site: Clements . James F. . James Clements . 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 . 2022-11-29 . . Ithaca, New York, United States . v2022.
  3. Web site: BirdLife Data Zone. HBW and BirdLife Taxonomic Checklist. 2022-11-29. version 6.0b. July 2022. BirdLife International.
  4. BirdLife International. . 2022 . Rhea americana . 2022 . e.T22678073A219615764 . 10.2305/IUCN.UK.2022-2.RLTS.T22678073A219615764.en . 7 July 2024.
  5. BirdLife International. . 2022 . Rhea pennata . 2022 . e.T22678081A217016710 . 10.2305/IUCN.UK.2022-2.RLTS.T22678081A217016710.en . 7 July 2024.
  6. BirdLife International. . 2020 . Rhea tarapacensis . 2020 . e.T22728206A177987446 . 10.2305/IUCN.UK.2020-3.RLTS.T22728206A177987446.en . 7 July 2024.

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