Botulinus is a type of bacterium which produces a poisonous toxin that could cause botulism in humanoid bodies.
History and specifics[]
After performing an autopsy on Scott Darnell in the year 2266, USS Enterprise CMO, Doctor Leonard McCoy, used botulinus as an example of fast acting poisons which leave little-or-no-trace in the body. (TOS - Star Trek 1 novelization: The Unreal McCoy)