Claassenia

Wu, 1934

common stoneflies

Species Guides

1

Claassenia is a of perlid stoneflies containing approximately 12 described . Members are predatory aquatic insects with nymphal stages inhabiting cobble substrates in lotic freshwater systems. The genus has been studied primarily in western North American streams, with detailed data available for Claassenia sabulosa.

Common stonefly, Claassenia sabulosa (7882547330) by Bob Henricks from Charlottesville, United States. Used under a CC BY-SA 2.0 license.Golden Stonefly Nymph by Mike Cline. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Claassenia: /klaˈseːni.a/

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Images

Habitat

Cobble substrates in lotic freshwater streams and rivers. Nymphs are benthic and strongly associated with rocky substrates in flowing water.

Distribution

North America including Colorado, Alberta, and Arizona; Russian Far East; China. Records span Subarctic America through temperate western North America and East Asia.

Seasonality

occurs late spring to early summer. Nymphal growth period extends from fall through spring, with during summer months.

Diet

Predatory. Nymphs are active in stream benthic .

Life Cycle

(one per year). undergo during summer. Nymphal development occurs from fall through spring. emerge late spring to early summer.

Behavior

engage in mate-finding . Nymphs exhibit restricted seasonal growth patterns aligned with cooler water temperatures.

Ecological Role

Predatory component of benthic stream . Contributes to energy transfer in cobble-dominated lotic .

Sources and further reading