Behningiidae

Definition

A primitive family of burrowing mayflies (Ephemeroptera) distributed across the Holarctic region. Nymphs inhabit sediment but lack the tusk-like mandibular projections typical of many burrowing mayflies; instead, they possess palp-like forelegs and have the mid- and hindlegs modified to cover and protect the ventral gills. The first abdominal gill is single and elongated relative to the paired gills on subsequent segments. Adults are rarely encountered.

Etymology

Example

The genus Dolania, the sole North American representative of Behningiidae, inhabits sandy riverbeds in the southeastern United States, where nymphs burrow without the tusk-assisted excavation seen in related families like Ephemeridae.

Related Terms

• Ephemeroptera
• Mayfly
• burrowing mayfly
• Holarctic
• Mandible
• ephemeral gill
• Dolania

Usage Notes

Distinguished from other burrowing mayfly families (Ephemeridae, Polymitarcyidae) by the absence of mandibular tusks and the protective leg modification over gills. The family is small—comprising only four genera—and its members are among the least frequently collected mayflies due to their subterranean nymphal habit and brief adult stage.