Nesameletidae

Definition

A family of mayflies (order Ephemeroptera) comprising small to medium-sized species with reduced mouthparts in the adult stage and aquatic nymphs typically inhabiting cool, fast-flowing streams. The family contains at least three genera and approximately eight described species, distributed primarily in the Southern Hemisphere including Australia, New Zealand, and South America.

Etymology

From the type genus Nesameletus (Greek nesos 'island' + generic element -ameletus, of uncertain derivation) + -idae (family suffix).

Example

Nymphs of Nesameletidae are used as bioindicators of high water quality in montane stream systems, as they require well-oxygenated, silt-free habitats.

Related Terms

• Ephemeroptera
• Mayfly
• Siphlonuridae
• Ameletidae
• bioindicator
• lotic

Usage Notes

Sometimes confused with the related family Ameletidae; Nesameletidae is distinguished by particular wing venation patterns and geographic distribution. The family represents an early-diverging lineage within the suborder Setisura.