Species like N. fasciata display distinct banding, whereas other species, like N. erythrogaster, have blotching, and those like N. rhombifer have diamond-shaped patterning. Most species are brown or olive green, or some combination thereof with markings being brown, or black.
Some species of the genus *Necturus* exhibit distinct banding patterns, while others, such as *Necturus erythrogaster*, display blotching, and still others, like *Necturus rhombifer*, have diamond-shaped markings. Most species are brown or olive green with brown or black markings.