IUCN threat status:

Endangered (EN)

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Taxon Biology

Larvae cling to rocks in swiftly-flowing, clear streams, where they graze algae. When ready to pupate, the larvae find depressions in the rocks and pupate facing down-stream. Adults emerge from the pupae with fully-formed wings and gather around the stream edge to mate. Adults are often found hanging on leaves and overhangs by their front legs (or front and middle legs). Females are predatory on smaller insects.

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http://diptera.myspecies.info/users/torsten

Source: The Diptera Site

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