Onychonycteris

Onychonycteris is an extinct genus of bat, which lived during the Eocene period, 52.5 million years ago, in the area that is now Wyoming. One species has been described, Onychonycteris finneyi. Using this species, it could be shown that these primitive bats first developed the ability to fly, before they had echolocation.[1]

Artists impression what the animal might have looked like

References
  1. Nancy B. Simmons, Kevin L. Seymour, Jörg Habersetzer und Gregg F. Gunnell: Primitive Early Eocene bat from Wyoming and the evolution of flight and echolocation. In: Nature. Band 451, 2008, S. 818–821, doi:10.1038/nature06549, ISSN 0028-0836
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