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'''Tytthostonyx''' is a genus of prehistoric seabird. Found in the much-debated Hornerstown Formation which straddles the Cretaceous-Paleocene boundary 65 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, 'Tytthostonygidae', but whether this is appropriate cannot be determined at present.