Phasia aldrichii
(Townsend, 1891)
Phasia aldrichii is a small tachinid fly (3–5 mm body length) distributed across most of North America, with additional records in Europe and Asia. The was described by Townsend in 1891 and later synonymized with Phasia karczewskii. As a member of the Phasia, it belongs to a diverse group of flies whose larvae develop inside other insects.
Pronunciation
How to pronounce Phasia aldrichii: /ˈfeɪʒə ælˈdrɪki.aɪ/
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Identification
Distinguishable from other Phasia by genitalia and subtle external characters; definitive identification requires reference to the original description or taxonomic keys in the monographic revision of the . Body size (3–5 mm) is smaller than some .
Appearance
Small tachinid fly with body length of 3–5 mm. Specific coloration and morphological details not documented in available sources.
Distribution
North America (Canada, United States, Mexico); also recorded from Hungary, Germany, Kazakhstan, Mongolia, and Russia. The Eurasian records may represent introductions or misidentifications requiring verification.
Ecological Role
As a tachinid fly, likely functions as a of other insects, though specific for P. aldrichii are not documented in available sources.
Similar Taxa
- Phasia aeneoventrisSimilar size and distribution; distinguished by abdominal coloration and male terminalia structure
- Phasia aurulansOverlapping range in North America; differs in thoracic and abdominal patterning
More Details
Taxonomic history
Phasia karczewskii, described by Draber-Mońko, was synonymized with P. aldrichii in the 2006 monographic revision of the . The belongs to one of six defined species-groups within Phasia, though which group is not specified in available sources.
Data limitations
Biological information (, , ) for this is not captured in the abstract of the primary taxonomic revision. The full 320-page monograph likely contains host records and additional distribution details.