Thegornis

Thegornis; Temporal range: early Miocene PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Falconiformes
Family:	Falconidae
Subfamily:	Herpetotherinae
Genus:	†Thegornis; Ameghino, 1895
Type species
	†Thegornis musculosus; Ameghino, 1895
Other species
	†T. debilis Ameghino, 1895; †T. spivacowi Agnolín, 2022; †T. sosae Agnolín, 2023;
Synonyms
	Noriegavis Agnolín, 2009;

Thegornis is an extinct genus of herpetotherine falconid that lived during the Miocene of South America. The genus was erected by Florentino Ameghino in 1895 based on two species, T. musculosus and T. debilis. However, T. debilis was later suggested to be an invalid species, with the differences between it and T. musculosus being due to sexual dimorphism. Two additional species, T. spivacowi and T. sosae, were subsequently named in later years by Federico Agnolín.^[1]^[2] Its skull and postcranial morphology are similar to the laughing falcon and forest falcon, which together form the clade Herpetotherinae.^[3]

The holotype specimen of Noriegavis (originally Cariama) santacrucensis was initially regarded as belonging to a unique seriema taxon, to which a second partial skeleton was referred in 2013.^[4] However, later study of these fossils indicated the holotype instead belongs to Thegornis, while the second specimen was given a new scientific name, Miocariama.^[5]

References

↑ Agnolín, Federico L. (2022). "New fossil birds from the Miocene of Patagonia, Argentina". Poeyana. 513: 1–43. ISSN 2410-7492.
↑ Agnolín, Federico L. (2023). "A new species of the Falcon genus Thegornis (Aves) from the Miocene of Northwestern Argentina" (PDF). Historia Natural. 13 (2): 15–24.
↑ Jorge I. Noriega; Juan I. Areta; Sergio F. Vizcaíno; M. Susana Bargo (2011). "Phylogeny and Taxonomy of the Patagonian Miocene Falcon Thegornis musculosus Ameghino, 1895 (Aves: Falconidae)". Journal of Paleontology. 85 (6): 1089–1104. Bibcode:2011JPal...85.1089N. doi:10.1666/10-122.1. hdl:11336/76576. S2CID 84262902.
↑ Mayr, Gerald; Noriega, Jorge (2013). "A well-preserved partial skeleton of the poorly known early Miocene seriema Noriegavis santacrucensis (Aves, Cariamidae)". Acta Palaeontologica Polonica. doi:10.4202/app.00011.2013. hdl:11336/41730.
↑ Noriega, Jorge Ignacio; Mayr, Gerald (2017). "The systematic affinities of the putative seriema Noriegavis santacrucensis (Noriega et al., 2009) from the Miocene of Argentina". Contribuciones del MACN. 7: 133–139. ISSN 1666-5503.

[T.spivacowi-1] Agnolín, Federico L. (2022). "New fossil birds from the Miocene of Patagonia, Argentina". Poeyana. 513: 1–43. ISSN 2410-7492.

[T.sosae-2] Agnolín, Federico L. (2023). "A new species of the Falcon genus Thegornis (Aves) from the Miocene of Northwestern Argentina" (PDF). Historia Natural. 13 (2): 15–24.

[3] Jorge I. Noriega; Juan I. Areta; Sergio F. Vizcaíno; M. Susana Bargo (2011). "Phylogeny and Taxonomy of the Patagonian Miocene Falcon Thegornis musculosus Ameghino, 1895 (Aves: Falconidae)". Journal of Paleontology. 85 (6): 1089–1104. Bibcode:2011JPal...85.1089N. doi:10.1666/10-122.1. hdl:11336/76576. S2CID 84262902.

[4] Mayr, Gerald; Noriega, Jorge (2013). "A well-preserved partial skeleton of the poorly known early Miocene seriema Noriegavis santacrucensis (Aves, Cariamidae)". Acta Palaeontologica Polonica. doi:10.4202/app.00011.2013. hdl:11336/41730.

[5] Noriega, Jorge Ignacio; Mayr, Gerald (2017). "The systematic affinities of the putative seriema Noriegavis santacrucensis (Noriega et al., 2009) from the Miocene of Argentina". Contribuciones del MACN. 7: 133–139. ISSN 1666-5503.

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