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Pero Moth (Pero spp.)

Detailing the physical features, habits, territorial reach and other identifying qualities of the Pero Moth

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Image Credit: Alex -icycatelf- Bowen
Full-sized image of the Pero-Moth Thumbnail image of the Pero-Moth

Loads of variation among all Pero Moths, as well as different looks for male and female, make it difficult to narrow down species.

Updated: 07/07/2021; Authored By Staff Writer; Content ©www.InsectIdentification.org
The general look of a Pero moth is consistent at the genus level, but the details are where uncertainty comes to play when trying to decipher a species name. Mostly all Pero Moths have a two-toned look thanks to a strong color separation between the upper and lower parts of the wings. The upper two-thirds of the wings darken as the color moves downward, and the lower third is lighter for a sharp contrast. The actual colors of the wings can vary so widely that it pinning down a species can be difficult in many cases. Some are purple and brown. Others are dark brown and light brown. Still others are dark brown and ivory. Many have a crimp or slight overlap in the edges of the wings, which creates shadows on the moth. The bottom edge of the wings is ruffled, though some ruffles are more pointed in some individuals.

The larvae are twig mimics and have skinny, brown bodies. Pine, fir, spruce, tamarack, black cherry, rose, aster, and legumes are all host plants among the different types of Pero caterpillars, though none of them seem to be significant pests.

General Characteristics
Capability, Shape, Texture/Pattern, Benefits, Dangers
Flying insect icon


Taxonomic Hierarchy
Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Lepidoptera
        Family: Geometridae
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          Genus: Pero
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            Species: spp.
Identifying Information
Size, Colors, Features
Scientific Name: Pero spp.
Category: Butterfly or Moth
Size (Adult; Length): 34mm to 40mm (1.33" to 1.57")
Colorwheel Graphic Colors: purple; brown; tan; black
Descriptors: two-toned; purple top; brown bottom; wavy wings; ruffled edge; dark; scallop; flying

Relative Size Comparison
Typical Size Between 34mm (1.3in) and 40mm (1.6in)
Lo: 34mm
Md: 37mm
Hi: 40mm
Territorial Map*
U.S., Canada, and Mexico
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Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Pero Moth may be found (but is not limited to). This sort of data is useful when attempting to see concentrations of particular species across the continent as well as revealing possible migratory patterns over a species' given lifespan. Some insects are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America. States/Territories shown above are a general indicator of areas inhabited by the Pero Moth. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.


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