In this section
Other true flies
- Dance fly (Empididae)
- Horse flies (Tabanidae)
- House fly (Muscidae)
- Long legged flies (Dolichopodidae)
- Marsh flies (Sciomyzidae)
- Mosquito (Coquillettidia)
- Mosquito (Culicidae)
- Moth fly (Psychodidae)
- Pelecorhynchid flies (Pelecorhynchidae)
- Primitive cranefly (Mischoderus)
- Rat tail maggots (Syrphidae)
- Sandfly or black fly (Austrosimulium)
- Shore flies (Ephydridae)
- Soldier fly (Stratiomyidae)
- Wood gnat (Anisopodidae)
The empidid flies are common in many New Zealand streams, but they can be easily overlooked due to their small size. There are different forms of larvae, but the most common form has a maggot-like body with a fully retracted head, and with 7 pairs of caterpillar-like prolegs along the abdomen. The pupae of some empidids are surrounded by radiating threads.
Empidid larvae are found in many stream types, but they can be particularly common amongst algal mats on stony streambeds.
We don’t know much about the diet of New Zealand empidids, but the larvae of overseas species are often predators and/or scavengers.
- Hard bottom: 3
- Soft bottom: 5.4
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
Empidid larvae can be common in farmland streams with some nutrient enrichment. They have low to moderate tolerance values of 3 (hard bottom sites) and 5.4 (soft bottom sites).