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The eastern dobsonfly, Corydalus cornutus, is the most well-known North American species among the dobsonflies. These genera have distinctive elongated mandibles in males and form the subfamily Corydalinae. The genera in which the males have normal mandibles, called fishflies, form the subfamily Chauliodinae.
The Asian Acanthacorydalis fruhstorferi can have a wingspan of up to 21.6 cm (8.5 in), making it the largest dobsonfly and the largest aquatic insect in the world by this measurement. [ 4 ] [ 5 ] The wings vary from a grayish to translucent shade, depending on the species, and the anal region of the hindwing is wide and folded at rest.
Eastern Dobsonfly (Corydalus cornutus) female. The adult dobsonfly is a large insect up to 140 millimetres long with a wingspan of up to 125 millimetres. [8] The female has short powerful mandibles of a similar size to those of the larva while the mandibles of the male are sickle-shaped and up to 40 millimetres long, half as long as the body. [1]
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Corydalus is a transliteration from the Greek κορδαλος (korúdalos) [3] meaning a crested lark or the flower, larkspur, apparently related to Greek corys (κορυς) a helmet crest. [4]
Corydalus cornutus - MHNT. Megaloptera is an order of insects.It contains the alderflies, dobsonflies and fishflies, and there are about 300 known species.. The order's name comes from Ancient Greek, from mega-(μέγα-) "large" + pteryx (πτέρυξ) "wing", in reference to the large, clumsy wings of these insects.
The male genitalia are diverse across the genus and can be useful only for species-level identification, especially the shape and size of the tenth tergum and the subgenital plate at the ninth sternum. Nuptial gifts in Protohermes may as large as 20% of the total body mass of the male and can require up to 2 days to recover before mating again. [4]
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. Forewing length ranges from 32-58 millimeters, with the females slightly larger than the males. [1] [2] [3]