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Tytthostonyx Temporal range: Late Cretaceous, 66 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Procellariiformes
Family:	†Tytthostonychidae Olson & Parris, 1987
Genus:	†Tytthostonyx Olson & Parris, 1987
Species:	†T. glauconiticus
Binomial name
†Tytthostonyx glauconiticus Olson & Parris, 1987

Tytthostonyx is a genus of prehistoric seabird. Found in the much-debated Hornerstown Formation which straddles the Cretaceous–Paleogene boundary 66 million years ago, this animal was apparently closely related to the ancestor of some modern birds, such as Procellariiformes and/or "Pelecaniformes". A single species is placed herein, Tytthostonyx glauconiticus.

It has been placed into a family of its own, Tytthostonychidae.

References

1. ^ Olson, S. and Parris, D.C. (1987). "The Cretaceous Birds of New Jersey." Smithsonian Contributions to Paleontology, 63: 22pp.

v t e Genera of penguins, petrels, and albatrosses and their extinct allies
Kingdom: Animalia Phylum: Chordata Class: Aves Infraclass: Neognathae Clade: Austrodyptornithes
Sphenisciformes incertae sedis †Arthrodytes †Aprosdokitos †Kaiika †Kumimanu †Kupoupou †Muriwaimanu †Nucleornis †Orthopteryx †Pakudyptes †Petradyptes †Sequiwaimanu †Tonniornis †Waimanu †Wimanornis Spheniscidae †Crossvallia †Dege †Duntroonornis †Korora †Icadyptes †Inguza †Inkayacu †Kairuku †Marambiornopsis †Marplesornis †Palaeoapterodytes †Perudyptes †Pseudaptenodytes †Tasidyptes †Tereingaornis †Palaeospheniscinae Eretiscus Palaeospheniscus †Paraptenodytinae Arthrodytes Paraptenodytes †"Palaeeudyptinae" Anthropodyptes Anthropornis Archaeospheniscus Delphinornis Marambiornis Mesetaornis Pachydyptes Palaeeudyptes Platydyptes Spheniscinae Aptenodytes Eudyptes Eudyptula †Madrynornis Megadyptes Pygoscelis Spheniscus
Procellariiformes incertae sedis †Kievornis †Lonchodytes? †Makahala †Diomedeoididae Diomedeoides Rupelornis †Marinavidae Marinavis †Tytthostonychidae Tytthostonyx Diomedeidae †Aldiomedes †Diomedavus Diomedea †Murunkus †Notoleptos Phoebastria Phoebetria †Plotornis Thalassarche †Tydea Oceanitidae Fregetta Garrodia Nesofregetta Oceanites Pelagodroma Hydrobatidae Hydrobates Procellariidae Aphrodroma Ardenna †Argyrodyptes Bulweria Calonectris Daption †Eopuffinus Fulmarus Halobaena Macronectes Pachyptila Pagodroma Pelecanoides †Primodroma Procellaria Pseudobulweria Pterodroma †Pterodromoides Puffinus Thalassoica

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• Procellariiformes
• Prehistoric bird genera
• Late Cretaceous birds of North America
• Extinct birds of North America
• Fossil taxa described in 1987
• Prehistoric bird stubs