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Double gill mayfly (Neozephlebia)

Taxonomic group

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

  • Hard bottom: 7
  • Soft bottom: 7.6

The tolerance values (ranging from 0 to 10) give an indication of which are the sensitive taxa (values of 8 or more) and which are the tolerant taxa (values of 3 or less). For more information see: Indicator species

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).