Meris

Species in this genus can be distinguished from related Ennominae by wing pattern and genitalic characters. The five described species show variation in forewing markings and coloration, ranging from gray-brown to more patterned forms. Specific identification requires examination of genitalic structures; external characters alone are often insufficient for distinguishing between species.

Species occur in montane and high-elevation habitats of western North America. Meris alticola, the type species, has been recorded from alpine and subalpine zones. Other species occupy coniferous forest and scrubland habitats at moderate to high elevations.

Restricted to western North America. Documented from California, Oregon, Washington, and adjacent regions. The genus shows a disjunct distribution pattern typical of montane-specialist geometrid moths in this region.

Adults have been recorded from late spring through summer, with peak activity varying by elevation. Higher-elevation species fly later in the season, typically July through August.

• EufidoniaBoth are Ennominae genera with similar wing shape and resting posture, but Eufidonia species generally show more uniform gray coloration and lack the distinct forewing pattern elements seen in Meris.
• LomographaSimilar overall appearance in some species, but Lomographa is primarily Palearctic and has different male genitalic structures; also tends to have more prominent wing markings.

• geometridae
• ennominae
• western north america
• montane
• alpine
• geometer moths

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life