Platycheirus hyperboreus
(Staeger, 1845)
Pearly Sedgesitter
Platycheirus hyperboreus, commonly known as the Pearly Sedgesitter, is a small () distributed across and regions of North America and northern Europe. are 5.3–8.7 mm in length and exhibit distinctive abdominal patterning with pale spots on dark . The is recognized by its modified legs, which are with gradually dilated —an associated with its . It occurs in northern latitudes ranging from Alaska and Greenland through Scandinavia to northern Siberia.
Pronunciation
How to pronounce Platycheirus hyperboreus: //ˌplætɪˈkaɪrəs ˌhaɪpərˈbɔːriəs//
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Identification
Distinguished from other Platycheirus by the combination of: gradually dilated (not strongly clubbed), front and middle legs with blackish middle , and the specific abdominal spot pattern—small rounded spots on 2, large quadrate spots on segments 3–4 that do not extend to segment . The is entirely trichose or nearly so. Similar species with modified front legs include P. trichopus and P. scutatus, which differ in leg coloration and tibial dilation patterns.
Images
Distribution
and regions: North America across Alaska, Canada, Greenland, and northern United States (south to North Carolina east, Nevada west); western and northern Europe including Norway, Finland, northern Russia (Kola Peninsula), and northern Siberia.
Similar Taxa
- Platycheirus trichopusSimilar modified legs, but differs in leg coloration and degree of tibial dilation; P. hyperboreus has more gradual tibial expansion.
- Platycheirus scutatusShares leg modification, but P. hyperboreus distinguished by front and middle legs versus darker leg coloration in P. scutatus.