Last seen in 1964: Plethodon ainsworthi, sp. nov. Ainsworth’s salamander is known only from two specimens collected by biologist Jackson Harold Ainsworth in 1964, two miles south of Bay Springs in Jasper County, Mississippi. Ainsworth initially assumed that these individuals were Northern slimy salamanders (Plethodon glutinosus). However, more than 30
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This is what remains of the holotype of the Ainsworth's salamander. The specimen is kept in the Museum of Comparative Zoology at Harvard University in Cambridge, Massachusetts, USA. (© DesmognathusFuscus, via Wikimedia Commons)