Corydalus affinis is a species of dobsonfly in the genus Corydalus. It is found in Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, and Venezuela. It is found mainly in Amazonian lowlands.
Diagnosis The head is flattened with a subtle dark stripe behind the eye. The male mandibles are long with reduced dentition. Both sexes have thin, very dark thread-like antennae. The wing is brown with small pale dots. The ectoproct of the male genitalia is densely covered by fine setae, elongate and flattened at the apical ¼. The gonostylus 9 is similar to the ectoproct. The 9th sternite is shaped like a square with rounded edges (subquadrate). The gonostyli 10 are moderately convergent and are shaped somewhat like rounded rectangles being 2 times as long as wide. The length of the male forewing is 32.0–58.0 mm and the length of the female forewing is 38.6–61.6 mm.
References