The termite was a lifeform type, an Earth insect animal.
In the year 2267, Spock used this insect as an example of symbiosis, as the termite requires bacteria to consume wood. (TOS - Star Trek 2 novelization: Operation -- Annihilate!)
Years later, Leonard McCoy jokingly mused that with Spock's half-Vulcan metabolic rate; he could consume a bowlful of termites with little or no digestive malfunction. (TOS movie: The Final Frontier)