Eurimyia

Adults can be distinguished from other Eristalini by specific wing venation and facial characteristics, though precise diagnostic features require specialist examination. The genus was separated from Lejops based on morphological differences in male genitalia and larval breathing siphon structure. Species-level identification relies on abdominal patterning and facial markings.

Wetland environments including marshes, swamps, and shallow standing water where larvae develop. Adults are often found in vegetation near aquatic breeding sites.

Recorded from Denmark (DK) and Norway (NO) in Europe; species occur more broadly with E. japonica in East Asia.

Larvae are aquatic and possess an elongated posterior breathing siphon (the 'rat-tail'), allowing them to respire while submerged in shallow, often organic-rich water. This siphon can extend several times the body length. Pupation occurs in moist soil or substrate at the water margin.

Larvae contribute to nutrient cycling in aquatic systems by processing decaying organic matter. Adults may serve as pollinators of wetland flora.

Larvae are medically harmless despite superficial resemblance to parasitic botfly larvae. The common name 'rat-tail maggot' sometimes causes unnecessary concern.

• LejopsFormerly included in this genus; separated based on male genitalia and larval siphon morphology. Lejops species generally have shorter larval breathing tubes.
• EristalisShares aquatic larval habitat and 'rat-tail' morphology; distinguished by adult facial structure and wing venation patterns.

The 'rat-tail maggot' common name leads to confusion with parasitic organisms; these larvae are non-parasitic decomposers.

• hoverfly
• Syrphidae
• rat-tail maggot
• wetland
• aquatic larvae
• Eristalini

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