Nemotelus

Distinguished from the similar genus Oxycera by the forked R4+5 wing vein and faint R2+3; Oxycera species lack this forked vein pattern. The conical, prominent facial lobe and dorsal antennal placement on a pointed snout are diagnostic. Males identified by nearly contiguous eyes with reduced ventral facets; females by more widely separated eyes. Species-level identification requires examination of male genitalia: basal segment of gonopods fused with hypandrium on lower side, which bears two elongated median outgrowths and a lateral outgrowth at the apex.

Fens, marshes, and damp meadows, often in association with seepages or standing water; some species occur in coastal salt marshes and calcareous dune slacks. Larval habitats include moss-covered seepages with flowing water, mud surfaces, and standing water margins. Adults frequently observed on flowers of Apiaceae (Umbelliferae) and Asteraceae (Compositae).

Nearctic, Afrotropical, and Palaearctic regions. Within the Palaearctic, recorded from Albania, Armenia, Austria, Azerbaijan, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, England, Estonia, France, Germany, Greece, Hungary, Ireland, Israel, Italy, Latvia, Morocco, Netherlands, Norway, Poland, Romania, Russia, Slovakia, Spain, Sweden, Switzerland, Tajikistan, Turkey, Wales, and Yugoslavia. In the British Isles, common in southern England and Wales, less common in northern England, scarce in Scotland, with scattered Irish records. Nearctic records include North America; Afrotropical records include South Africa.

Adult flight period primarily May to August, with peak activity in late June to early July for well-studied species. Some variation exists among species and geographic regions.

Larvae yellow to pale brown with dark median stripe and irregular dark oblique lateral stripes; found in wet habitats including fens, seepages, and standing water margins. One species (N. nigrinus) has been reared from a swan's nest. Puparium undescribed for most species. Adults emerge primarily in summer months.

Adults are notably sluggish and easily captured by hand. Often observed in aggregations on flowers, particularly Apiaceae and Asteraceae. Not lively fliers compared to other soldier flies.

Subject of recent genomic research including whole-genome sequencing of Nemotelus pantherinus (Darwin Tree of Life Project) and Nemotelus nigrinus, contributing to biodiversity genomics and dipteran phylogenetic studies. Of minor interest to entomologists studying wetland faunas.

• OxyceraSimilar body shape and wing venation, but distinguished by unforked R4+5 wing vein and more prominent R2+3; lacks the conical facial lobe and pointed snout of Nemotelus

• Stratiomyidae
• soldier flies
• wetland insects
• Palaearctic
• Nearctic
• Afrotropical
• genome sequenced
• sexual dimorphism

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• The Genera Nemotelus and Oxycera (Diptera, Stratiomyidae) in the Arasbaran Forests
• The genome sequence of a soldier fly, Nemotelus pantherinus (Linnaeus, 1758).
• The genome sequence of a soldierfly, Nemotelus nigrinus (Fallén, 1817).