Name: Onychonycteris ‭(‬Clawed bat‭)‬.
Phonetic: Oh-nik-o-nik-teh-riss
Named By: Nancy B.‭ ‬Simmons,‭ ‬Kevin L.‭ ‬Seymour,‭ ‬Jorg Habersetzer‭ & ‬Gregg F.‭ ‬Gunnell‭ ‬-‭ ‬2008.
Classification: Chordata,‭ ‬Mammalia,‭ ‬Chiroptera, Onychonycteridae, Onychonycteris.
Species: O.‭ ‬finneyi‭ (‬type‭)‬.
Diet: Insectivore.
Size: Roughly‭ ‬25‭ ‬centimetres long,‭ ‬52‭ ‬centimetre wingspan.
Known locations: USA,‭ ‬Wyoming‭ ‬-‭ ‬Green River Formation.
Time period: Ypresian of the Eocene.
Fossil representation: Almost complete skull and skeleton preserved flat on a slab.

       Onychonycteris existed during the Eocene,‭ ‬and is regarded as one of the most primitive bats known.‭ ‬So primitive is Onychonycteris that the fingers all still have large claws on their ends,‭ ‬and study of the skull and ear bones strongly suggests that Onychonycteris was incapable of using echolocation to find prey.‭ ‬This is a clear indication that echolocation was developed in bats after they had already taken to the air.‭

Further reading
-‭ ‬Primitive Early Eocene bat from Wyoming and the evolution of flight and echolocation.‭ ‬-‭ ‬Nature‭ ‬451‭ (‬7180‭)‬:‭ ‬818‭–‬21.‭ ‬-‭ ‬Nancy B.‭ ‬Simmons,‭ ‬Kevin L.‭ ‬Seymour,‭ ‬Jorg Habersetzer‭ & ‬Gregg F.‭ ‬Gunnell‭ ‬-‭ ‬2008.
- A bony connection signals laryngeal echolocation in bats. - Nature. Nature Publishing Group. 463 (7283): 939–942. - Nina Veselka, David D. McErlain, David W. Holdsworth, Judith L. Eger, Rethy K. Chhem, Matthew J. Mason, Kirsty L. Brain, Paul A. Faure & M. Brock Fenton - 2010.


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