The beetles belonging to the famiy Dytiscidae are all aquatic. They spend their biological cycle in aquatic environments and are carnivores. Its body is hidrodinamyc and it has got hairs on its rear legs to swim more efficiently. They keep the air underneath their elytra, which are the hardened forewings which function like a case for the hindwings. When they need to get more air they go up to the surface exposing their rear part first. Though they are aquatic their wings are fully developed and can fly very well.