The longnose gar (Lepisosteus osseus), also known as longnose garpike or billy gar, is a ray-finned fish in the family Lepisosteidae. The genus may have been present in North America for about 100 million years. References are made to gars being a primitive group of bony fish because they have retained some primitive features, such as a spiral valve intestine, but gars are a highly evolved group of fish, and not primitive in the sense of not being fully developed.
They have an olive-brown to green, torpedo-shaped body armored with ganoid scales, elongated jaws that form a needle-like snout nearly three times the length of their head, and a row of numerous sharp, cone-shaped teeth on each side of the upper jaw. They typically inhabit freshwater lakes, brackish water near coastal areas, swamps, and sluggish backwaters of rivers and streams. They can breathe both air and water, which allows them to inhabit aquatic environments that are low in oxygen.
Longnose gar is found along the east coasts of North and Central America and ranges as far west in the US as Kansas, Texas, and southern New Mexico. They are the only species of the family Lepisosteidae found in New Mexico. Their populations are stable and in some areas abundant in the interior portions of their range.