In 2016, researchers investigated an intertidal species of fish called a mummichog. On these launches they flew tortoises, rats, and mummichog. The body of the mummichog is elongate but thick, with a deep caudal peduncle. The mummichog belongs to the order Cyprinodontiformes, and the family Fundulidae. Internally, the banded killifish has 4-7 gill rakers, as opposed to 8-12 in the mummichog.