Cladornis

Cladornis; Temporal range: Oligocene PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Infraclass:	Neognathae
Clade:	Neoaves
Genus:	†Cladornis; Ameghino, 1895
Type species
	†Cladornis pachypus; (Ameghino, 1895)

Cladornis is an extinct genus of bird from the early Oligocene of Argentina. Known from a single partial tarsometatarsus, its taxonomic placement is uncertain. It has been variously described as some kind of terrestrial penguin, a pelecaniform, and a "very large and extremely weird land bird". The shaft of the tarsometatarsus of Cladornis was very flat and short, and the distal head suggests strong development of the toes.

References

1 2 3 Mayr, Gerald (2022). Paleogene fossil birds. Fascinating life sciences (2nd ed.). Cham: Springer. ISBN 978-3-030-87644-9.
↑ Olson, Storrs (1985). Avian biology. New York: Academic Press. p. 193. ISBN 0122494083.

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[paleogene-birds-1] 1 2 3 Mayr, Gerald (2022). Paleogene fossil birds. Fascinating life sciences (2nd ed.). Cham: Springer. ISBN 978-3-030-87644-9.

[2] Olson, Storrs (1985). Avian biology. New York: Academic Press. p. 193. ISBN 0122494083.