Landcare Research - Manaaki Whenua

Landcare-Research -Manaaki Whenua

Guide to New Zealand's freshwater invertebrates

Double gill mayfly ( Leptophlebiidae : Neozephlebia )

Diagnostic features

Neozephlebia mayfly nymphs have a flattened body form, a long oval abdomen and very slender double gills.

Typical habitats

larvae are less common than other mayflies like Zephlebia or Austroclima but they can be found in gravelly or woody, often bush-covered streams.


Leptophlebiid mayflies feed by scraping diatom algae and other organic matter from stone or plant surfaces.

Indicator value

Neozephlebia larvae are most common in streams and rivers with good water quality. They have tolerance values of 7 (hard bottom sites) and 7.6 (soft bottom sites).