Stenelmis

Dufour, 1835

riffle beetle

Species Guides

15

Stenelmis is the largest and most widespread of beetles in the Elmidae. Members are commonly known as riffle beetles due to their association with fast-flowing stream . The genus contains numerous distributed across multiple continents, with documented presence in North America, Europe, and the Caucasus region.

Stenelmis occidentalis by (c) Luke Padon, some rights reserved (CC BY), uploaded by Luke Padon. Used under a CC-BY license.Stenelmis moapa by (c) Jason Eckberg, some rights reserved (CC BY), uploaded by Jason Eckberg. Used under a CC-BY license.Stenelmis sinuata by (c) Matthew Pintar, some rights reserved (CC BY), uploaded by Matthew Pintar. Used under a CC-BY license.

Pronunciation

How to pronounce Stenelmis: //stɛnˈɛlmɪs//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Images

Habitat

Riffle in streams—fast-flowing, shallow water with rocky or gravel substrates. Larvae are strictly aquatic and inhabit the fastest-flowing portions of streams. are semi-aquatic, capable of both aerial and aquatic locomotion, and return to water to feed and mate.

Distribution

Widespread across multiple continents. Documented in North America (including Vermont, USA), Europe (Sweden, Norway), and the Caucasus region (Krasnodar Krai, Republic of Adygea, Abkhazia, and possibly Armenia).

Life Cycle

Complete with , larval, pupal, and stages. Larvae are aquatic and inhabit riffle zones. occurs in moist terrestrial environments near the water's edge. Adults are semi-aquatic.

Behavior

possess a —an air bubble held by hydrofuge body hairs—allowing extended underwater respiration. Larvae inhabit fast-flowing riffle zones. Adults are capable of both aerial and aquatic locomotion.

Ecological Role

Aquatic /herbivore in stream ; contributes to nutrient cycling and organic matter processing in riffle .

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Sources and further reading