Platycheirus thylax
Hull, 1944
Yellow-legged Sedgesitter
Platycheirus thylax is a of hoverfly in the Syrphidae, described by Hull in 1944. It is commonly known as the Yellow-legged Sedgesitter. Like other members of the Platycheirus, it is a small fly associated with wetland vegetation. The species is rarely recorded, with only two observations documented on iNaturalist.
Pronunciation
How to pronounce Platycheirus thylax: //ˌplætɪˈkaɪrəs ˈθaɪlæks//
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Identification
Members of the Platycheirus are distinguished from other hoverflies by their elongated, slender legs with modified in males, which are used in mating displays. Specific identification of P. thylax likely requires examination of male genitalia and leg . The 'Yellow-legged Sedgesitter' suggests pale leg coloration may be a distinguishing feature.
Behavior
Males of the Platycheirus perform characteristic mating displays using their modified front legs, waving them in front of females. This is presumed for P. thylax based on genus-level traits, though direct observation has not been documented.
Similar Taxa
- Platycheirus trichopusAnother member of the same with similar and preferences; distinguished by specific leg and genitalia characteristics.
- Other Platycheirus speciesMany share wetland and similar body plans; precise identification requires examination of male terminalia.
More Details
Nomenclature
The specific epithet 'thylax' derives from Greek, meaning 'watcher' or 'guard', possibly alluding to or association.
Data Deficiency
This has minimal occurrence records in major biodiversity databases (GBIF reports no distribution records; iNaturalist shows only two observations), indicating it is either genuinely rare, under-recorded, or taxonomically problematic.