Magusa divaricata
(Grote, 1874)
Variable Narrow-wing, Orbed Narrow-wing
Magusa divaricata is a noctuid first described by Augustus Radcliffe Grote in 1874. The species was formerly treated as a synonym of Magusa orbifera but has been reinstated as valid. It is a migratory species with an exceptionally broad geographic range spanning from eastern Canada to southern South America. The species exhibits seasonal northward movement in late summer and fall.
Pronunciation
How to pronounce Magusa divaricata: /məˈɡuːsə ˌdaɪvəˈraɪkətə/
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Identification
Previously confused with Magusa orbifera, from which it has been separated based on taxonomic revision. The specific epithet 'divaricata' refers to spreading or diverging characteristics, though the precise diagnostic features separating it from M. orbifera are not detailed in available sources. The 'Orbed Narrow-wing' has been applied to both , contributing to historical confusion.
Images
Appearance
Wingspan approximately 40 mm. Detailed morphological description not available in sources.
Distribution
Eastern Canada southward through the Caribbean and Central America to Paraguay and Argentina. Records indicate presence across North America, Middle America, Caribbean, and South America. Irregular occurrence reported in Manitoba, Canada.
Seasonality
are active during late summer and fall in northern portions of range, coinciding with northward migratory movement. Specific in tropical portions of range not documented.
Behavior
Exhibits migratory , traveling northward in late summer and fall. Specific details regarding migratory triggers, distances, or return movements not documented.
Similar Taxa
- Magusa orbiferaFormerly treated as ; the two share the 'Orbed Narrow-wing' and have been subject to taxonomic confusion requiring revision to separate.
More Details
Taxonomic history
Originally described as Stictoptera divaricata by Grote in 1874. Long treated as a synonym of Magusa orbifera but recently reinstated as a valid based on taxonomic revision. The specific epithet 'divaricata' (Latin for 'spread apart' or 'diverging') may refer to wing pattern or structural characteristics.
Nomenclatural note
The 'Orbed Narrow-wing' has been applied to both M. divaricata and M. orbifera, potentially causing confusion in historical literature and specimens. The alternative common name 'Variable Narrow-wing' appears to be more specifically associated with this .