Corydalus

Corydalus is a genus of large aquatic insects belonging to the order Megaloptera and the family Corydalidae. These insects are commonly known as dobsonflies. They are characterized by their powerful mandibles, particularly in the males, which can be quite formidable. The larvae, often called hellgrammites, are predatory and inhabit freshwater streams and rivers. They are an important part of the aquatic ecosystem, serving as a food source for fish and other aquatic organisms. Hellgrammites are known for their tough exoskeletons and aggressive nature.

The life cycle of Corydalus typically involves an aquatic larval stage that can last for several years. During this time, the larvae molt numerous times, growing significantly. Once fully grown, the larva emerges from the water and seeks a moist location, often under logs or rocks, to pupate. The adult dobsonfly emerges from the pupa and has a relatively short lifespan, during which its primary purpose is reproduction. Adult dobsonflies are nocturnal and are attracted to lights. They feed on nectar, fruit, or other insects. The genus Corydalus is found in the Americas.