Snnanagfashtalli was a felinoid officer who served in Starfleet in the 23rd century. Her species was similar to the Eeiauoans, but proved immune to ADF syndrome. She and Doctor Evan Wilson fought, pitting her claws and against Wilson's quarterstaff, with mixed results before reaching Sivao.
Snnanagfashtalli was described as a two-legged leopard with maroon, scarlet and cream colored fur, and ruby colored fangs. She proved popular with the crew of the Enterprise and was nicknamed "Snarl" and "Fashtall". She also became good friends with Jenniver Aristeides. (TOS novel: The Entropy Effect)
By 2285, Snnanagfashtalli was a Lieutenant commander, and beamed down to Gateway with Beranardi al Auriga and Max Arrunja in order to return Spock to the USS Enterprise. (TOS novel: Time for Yesterday)