You're talking about hexagonal arowana! The head is wide, the eyes are small, the tongue is big, and only two sides are free. The vomeroid teeth are arranged horizontally, some are far apart, and some are "M"-shaped. No forehead scale arc. Spinal biconcave type. The costal groove on the side of the body is obvious. Most species of adults are mainly terrestrial, burrowing in soil holes and fertilizing in vivo. There are about 30 kinds. Widely distributed, north to southeastern Alaska and south to the Mexican Plateau. When they breed in early spring, they enter ponds or streams to lay eggs, and some species lay eggs on land in autumn. When the winter rain comes, the larvae enter the water to live. Eggs attach to branches or other objects. The female salamander lays about 100 ~ 300 eggs, which are divided into several clusters, with an average of about 16 eggs in each group. The eggs are very dark brown, and they hatch in about 30 ~ 45 days. The larvae are about 12 mm long and the branches are balanced.