Systenus albimanus
Wirth, 1952
Systenus albimanus is a of in the , described by Wirth in 1952. It belongs to the Medeterinae, a group of small to -sized predatory commonly found in moist . The species is characterized by its distinctive fore , referenced in its specific epithet 'albimanus' (white hand). Like other dolichopodids, it is presumed to be predatory as both and larval stages, though specific ecological studies on this species are limited.
Pronunciation
How to pronounce Systenus albimanus: /ˈsɪstɛnəs ˌælbɪˈmeɪnəs/
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Identification
Distinguished from congeneric primarily by the fore referenced in its name. Medeterinae can be separated from other by characters, including the position of crossveins and the shape of the . Within Systenus, examination of male and leg coloration patterns is typically required for species-level identification. The combination of white fore tarsi with otherwise typical dolichopodid should separate this species from most .
Images
Appearance
Small to -sized with the characteristic slender body and elongated legs typical of . The specific epithet 'albimanus' refers to the fore , a distinctive diagnostic feature. Body likely metallic green, , or -colored as is common in the . clear with typical for Medeterinae. short with . in size and spacing probable, with males having larger eyes that may meet dorsally.
Habitat
preferences are not specifically documented for this . Members of Medeterinae are generally associated with moist environments including stream banks, marsh edges, wet meadows, and riparian vegetation. Larval stages likely develop in moist soil, decaying vegetation, or mud at water margins.
Distribution
Distribution data are sparse. The is represented in the UCR Research Museum collection, suggesting occurrence in California or the western United States. Seven observations are recorded in iNaturalist, though specific localities are not detailed in available sources.
Similar Taxa
- Other Systenus species share general body plan and metallic coloration; require examination of leg coloration patterns and male for separation
- Other Medeterinae genera (e.g., Medetera)Similar preferences and general ; differ in details and leg proportions
More Details
Taxonomic Note
The Systenus is placed in Medeterinae, which has undergone significant taxonomic revision. in this group rely heavily on male genitalic characters and subtle differences in leg coloration.
Collection History
Specimens of this are present in the University of California, Riverside Research Museum collection, indicating it has been collected in the course of regional faunistic surveys.