Published November 24, 2025 | Version v1
Journal article Open

Northward range extension of Atrichops crassipes (Meigen, 1820) (Diptera, Athericidae) in the Baltic ecoregion, with the first record from Latvia

  • 1. Latvian Environment, Geology and Meteorology Centre, Riga, Latvia|University of Latvia, Riga, Latvia
  • 2. Latvian Environment, Geology and Meteorology Centre, Riga, Latvia
  • 3. Latvian National Museum of Natural History, Riga, Latvia
  • 4. State Scientific Research Institute Nature Research Centre, Vilnius, Lithuania

Description

The first record of Atrichops crassipes (Meigen, 1920) (Diptera, Athericidae) in Latvia is reported, together with additional findings from Lithuanian waters in 2015. The data are based on larval records collected during freshwater macroinvertebrate research and water‑quality monitoring. Atrichops crassipes represents a new Diptera species record for Latvia and marks the northernmost limit of the species known range. Our data suggest that A. crassipes is expanding its range northward, possibly driven by climate warming.

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