Identification difficulty = 3.
according to Ball & Morris, 20241
Cheilosia nasutula Becker in Stubbs & Falk (1983)2.
The larva of this species remains unknown. Adults are most often found visiting flowers in either open or wooded situations (both deciduous or coniferous), or (especially males) basking on sun-lit leaves.
The following plots show the number of unique records per week that were not reported to be of eggs, larvae or pupae.
This species has a markedly northern distribution. It is frequent from North Wales and the Pennines northwards, and is amongst the commonest Cheilosia in Scotland. There are a few records from southern England, but confusion with C. antiqua and C. nigripes is possible and consequently several such records have been discounted.
The following plots show the Frescalo TFactor vs year and a map of the rescaled frequency (all records) for the species. For an explanation see here.