The small Samoan flying fox (Pteropus allenorum) is a species of fruit-eating megabat whose type specimen was originally collected in Samoa in 1856, but was not identified as a new species until 2009. Its wingspan was at least two feet, and it weighed around 8 oz. As the type specimen is dead, and no other examples of the species are known, it is believed to be extinct.
References
A new species found in a jar, The Philadelphia Inquirer, July 11, 2009 http://www.philly.com/inquirer/local/20090711_A_new_species_found_in_a_jar.html ↩
Helgen, K. M. (Kristofer M.); Helgen, Lauren E.; Wilson, Don E. (2009). "Pacific flying foxes (Mammalia, Chiroptera) : two new species of Pteropus from Samoa, probably extinct". American Museum Novitates (3646): 1–37. doi:10.1206/614.1. S2CID 36030956. http://digitallibrary.amnh.org/handle/2246/5965 https://zenodo.org/record/5357156 ↩