Claassenia Stonefly vs Spring Fishfly

Side-by-side species comparison

Claassenia Stonefly

A large predatory stonefly with a mottled yellow and brown pattern. The nymphs are active nocturnal hunters that roam the stream bed seeking prey.

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Nymphs often crawl out of the water at night to hunt, making them vulnerable to bats and spiders.

A medium-sized fishfly with pectinate antennae found in eastern North America. Adults are attracted to lights near rivers and streams during spring.

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Spring fishflies can be distinguished from dobsonflies by their feathery, comb-like antennae and smaller body size.