Cladornis Temporal range: Oligocene PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
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.^[1] It has been variously described as some kind of terrestrial penguin, a pelecaniform, and a "very large and extremely weird land bird".^[1][2] The shaft the tarsometatarsus of Cladornis was very flat and short, and the distal head suggests strong development of the toes.^[1]

v t e Genera of ibis, herons, pelicans and their extinct allies
Kingdom: Animalia Phylum: Chordata Class: Aves Clade: Aequornithes Order: Pelecaniformes
Pelecaniformes incertae sedis †Cladornis? †Torotigidae? Torotix Pelecani Balaenicipitidae Balaeniceps †Goliathia †Paludiavis Pelecanidae †Eopelecanus †Miopelecanus Pelecanus Scopidae Scopus Ardei See below ↓
Ardei incertae sedis †Ardeacites? †Xenerodiopidae Xenerodiops Threskiornithidae incertae sedis †Gerandibis †Milnea †Mopsitta? †Protibis †Rhynchaeites †Vadaravis †Xenicibis Plataleinae Platalea Threskiornithinae †Apteribis Bostrychia Cercibis Eudocimus Geronticus Lophotibis Mesembrinibis Nipponia Phimosus Plegadis Pseudibis Thaumatibis Theristicus Threskiornis Ardeidae †Ardeagrandis Calherodius †Eoceornis †Matuku †Nyctisoma Oroanassa †Proardeola Agamiinae Agamia Ardeinae Ardea Ardeola Bubulcus Butorides Egretta Gorsachius Nycticorax Nyctanassa Pilherodius †Proardea Syrigma †Zeltornis Zonerodius Botaurinae Botaurus Ixobrychus †Pikaihao Zebrilus Cochleariinae Cochlearius Tigriornithinae †Taphophoyx Tigriornis Tigrisoma