Alloperla

Banks, 1906

Species Guides

Alloperla concolor(Duckhead Sallfly)
Alloperla petasata(Woodlands Sallfly)

Alloperla is a of stoneflies in the Chloroperlidae. within this genus inhabit running water environments, including the hyporheic zones of gravel-bed rivers. Some species exhibit extended larval development periods and specialized feeding habits. The genus has a broad distribution across the Holarctic region.

Alloperla by (c) Matt Bowser, some rights reserved (CC BY), uploaded by Matt Bowser. Used under a CC-BY license.

Pronunciation

How to pronounce Alloperla: //ˌæloʊˈpɜːrlə//

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Images

Habitat

Forest streams and rivers; gravel-bed rivers with accessible hyporheic zones. Some occupy the hyporheic zone (subsurface saturated sediments) during larval development. are found in riparian zones near sites. In China, collected at elevations of 364–589 m in mountainous regions.

Distribution

Holarctic distribution including North America (Alberta, Alabama, Arkansas, Tennessee), Asia (Japan, northern China including Heilongjiang, Liaoning, Inner Mongolia, Gansu, South Korea, Russia, Mongolia, Siberia, Afghanistan).

Seasonality

has been observed May–August for at least one .

Life Cycle

Larval development is prolonged; one has been documented with a ~3-year larval stage spent primarily in the hyporheic zone. are short-lived (7–10 days in the documented species). Larval cohorts may show size-structured groups with sex dimorphism in body size.

Behavior

Larvae of some inhabit the hyporheic zone, spending most of their development in subsurface river sediments. Temporal diet shifts with seasonal prey switching have been documented in at least one species.

Ecological Role

in stream , feeding on benthic and hyporheic such as Oligochaeta and Chironomidae. Member of hyporheic alongside other stoneflies (Leuctridae) and (small Lepidostoma).

More Details

Species diversity

The contains multiple ; taxonomic work in China has described new species and provided identification keys for regional fauna.

Research limitations

Detailed data are available for only a few (notably A. ishikariana in Japan and A. mediana in Tennessee). Most ecological and behavioral information derives from single studies that may not represent -wide traits.