Platycheirus clypeatus (Meigen, 1822)

Identification

Identification difficulty = 3. according to Ball & Morris, 2024¹

Synonymy

Speight & Goeldlin (1990)² and Goeldlin et al. (1990)³ split Platycheirus clypeatus into a complex of species, separating off P. europaeus, P. occultus and P. ramsarensis. Records of P. clypeatus that predate this split may relate to any of these species unless  a specimen is available for redetermination.

Biology

The early stages of this common species require further investigation. The larva is rarely found at aphid colonies, and may be a generalised predator within the litter layer. It is found in all sorts of grassy situations, but most abundantly in damp grassland including pond, stream and ditch margins. Adults fly low down amongst tall vegetation and are easily found by sweeping. They also visit a wide range of flowers including sedges and grasses.

Flight period

The following plots show the number of unique records per week excluding those reported to be of immature stages.

Distribution

Of the segregates from the P. clypeatus complex, this remains by far the commonest and most widespread, occurring throughout Britain although it has shown a marked decline in the frequency with which it is recorded over the last few decades.

Trends

The following plots show the Frescalo TFactor vs year and a map of the rescaled frequency (all records) for the species.