Ephemerythidae

Definition

A family of small mayflies (order Ephemeroptera) characterized by reduced wing venation and simplified mouthparts in the adult stage. Members typically inhabit running waters and exhibit brief adult lifespans typical of the order. The family is distinguished from related mayfly families by specific traits in the nymphal gills and adult genitalia.

Etymology

From Greek ephemeros (short-lived) + erythros (red), referring to the reddish coloration of some species

Example

Nymphs of Ephemerythidae cling to stones in fast-flowing streams, using their flattened bodies and modified gills to withstand current while grazing on periphyton.

Related Terms

• Ephemeroptera
• Baetidae
• Caenidae
• Mayfly
• ephemeral insect
• aquatic insect nymph

Usage Notes

A relatively small family within Ephemeroptera; specialists distinguish Ephemerythidae from the more diverse Baetidae and Caenidae by details of the gill structure and costal margin of the forewing. Adult specimens are rarely encountered due to their extremely short emergence periods.