1, the male body is slim, and the cloaca is swollen and convex;

2. The female body is large and the cloaca is flat.

Larvae can't tell male from female.

The genus Hexagosaurus has a wide head, small eyes, large tongue and only two sides are free. The vomeroid teeth are mostly placed horizontally, some are far apart, and some are in an "M" shape. Hexagonal dragon has no forehead scale arc, and the vertebral body is concave. The costal groove on the side of the body is obvious. Most species of adults are mainly terrestrial and live in caves. In vivo fertilization.

Extended data:

The adult Hexagonal Dinosaur Mystictus lived in humid environment, and only returned to stream to lay eggs in breeding season. Live in a freshwater lake. Due to environmental damage, it has been limited to canals and lagoons around the southern edge of Mexico City. The altitude of survival in the wild is 2290 meters. ?

The Hexagonal Dinosaur Mystictus is inactive during the day, and the gill substrate is open at rest, moving slowly, and sometimes it may take epidermal air to exhale. They eat algae, but also aquatic invertebrates, arthropods, snails, small fish, tadpoles and young frogs. Poor vision, predation mainly depends on smell or lateral line.