Metanema
Guenée, [1858]
Species Guides
3- Metanema brunneilinearia
- Metanema determinata(Dark Metanema Moth)
- Metanema inatomaria(Pale Metanema Moth)
Metanema is a of in the Geometridae, Ennominae. The genus was erected by Achille Guenée in 1857 (published 1858) and currently contains approximately 14 described distributed primarily in the Americas. Species within this genus are part of the diverse geometrid moth fauna, commonly known as inchworm or geometer moths due to the characteristic looping locomotion of their larvae.
Pronunciation
How to pronounce Metanema: /ˌmɛtəˈniːmə/
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Identification
of Metanema generally exhibit the typical wing of Ennominae geometrids, with relatively broad, somewhat triangular forewings and more rounded hindwings. Specific diagnostic features for distinguishing Metanema from related within the tribe Boarmiini (or related ennomine groups) are not well-documented in available literature; examination of genitalic structures is typically required for definitive identification. The genus name has occasionally been confused with similar-sounding geometrid genera, necessitating careful attention to spelling.
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Distribution
of Metanema are known from the Americas, with records from North America (United States, Mexico), Central America, and South America (including Ecuador, Peru, and other Andean regions). The appears to have its greatest diversity in tropical and subtropical regions of the New World.
Similar Taxa
- BoarmiaSimilar wing pattern and body form in some ; both belong to Ennominae and may require genitalic examination for separation.
- SelidosemaOverlapping distribution and general morphological similarity; distinguished by subtle differences in wing venation and male genitalia.
- IridopsisNorth American of Metanema may be confused with this common geometrid ; Iridopsis typically shows more pronounced forewing markings and different resting posture.
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Taxonomic History
The authorship date is sometimes cited as 1857 (when Guenée erected the ) versus 1858 (publication date). The genus has been placed in various tribes within Ennominae, with current classification generally assigning it to Boarmiini or a related group, though precise tribal placement may vary among authorities.
Species Diversity
The number of included has fluctuated with taxonomic revisions. Several species were described by Schaus in the early 1900s from Central and South American material, suggesting significant undescribed diversity may remain in poorly collected Neotropical regions.