Gambusia quadruncus (Llanos Mosquitofish) is a species of ray-finned fishes in the family livebearers. They are associated with freshwater habitat. Individuals can grow to 2.8 cm.
Central America: Mexico within the following drainages: RÃo Guayalejo-TamesÃ, RÃo Pánuco, Laguna de Tamiahua, RÃo Tigre, RÃo Carrizal and RÃo Soto La Marina
Definition: length of a fish measured from the tip of the snout to the posterior end of the last vertebra or to the posterior end of the midlateral portion of the hypural plate. Simply put, this measurement excludes the length of the caudal fin