Species Details

Mesothea incertata

University of Alberta E.H. Strickland Entomological Museum Read more about this collection »

Common NamePlain Emerald, Day Emerald SeasonalityIn Alberta adults fly in May and June, peaking mid May through early June. IdentificationA small dusky green geometrid with a faint (sometimes absent) transverse PM line. Flight-worn individuals can fade to a dusky tan, quite unlike the dusky olive of freshly emerged moths. The small size, uniform green abdomen and absence of a PM line will separate this species from other emeralds (Nemoria, Synchlora and Cheteoscelis). Ferguson (1985) recognized two subspecies, both of which occur in Alberta. The nominate subspecies is slightly smaller with more distinct transverse lines, and occurs across the boreal region to the foothills. Subspecies viridipennata (Hulst) occurs from the Rocky Mountains west.

Scientific Name Mesothea incertata Common Name Plain Emerald, Day Emerald Habitat Dry open mixedwood and pine forest, peat bogs and grasslands. Seasonality In Alberta adults fly in May and June, peaking mid May through early June. Identification
A small dusky green geometrid with a faint (sometimes absent) transverse PM line. Flight-worn individuals can fade to a dusky tan, quite unlike the dusky olive of freshly emerged moths. The small size, uniform green…
A small dusky green geometrid with a faint (sometimes absent) transverse PM line. Flight-worn individuals can fade to a dusky tan, quite unlike the dusky olive of freshly emerged moths. The small size, uniform green abdomen and absence of a PM line will separate this species from other emeralds (Nemoria, Synchlora and Cheteoscelis). Ferguson (1985) recognized two subspecies, both of which occur in Alberta. The nominate subspecies is slightly smaller with more distinct transverse lines, and occurs across the boreal region to the foothills. Subspecies viridipennata (Hulst) occurs from the Rocky Mountains west.
Life History
The caterpillar is green with a brown dorsal stripe. The body is slender and without noticeable bumps or protrusions, and the head and first thoracic segment each bear a pair of pointed horns (Wagner et al. 2001). The…
The caterpillar is green with a brown dorsal stripe. The body is slender and without noticeable bumps or protrusions, and the head and first thoracic segment each bear a pair of pointed horns (Wagner et al. 2001). The pupa overwinters. The adults are strictly diurnal. In the boreal forest, adults fly in open peat bogs, but this species is also found in dry montane and eroding river valley habitats associated with patches of bearberry (Arctostaphylos uva-ursi).
Conservation No concerns. Diet Info
Known larval hosts include a variety of shrubs in the Betulaceae, Salicaceae, Ericaceae and Rosaceae (Wagner et al. 2001). Associated with Labrador Tea (Ledum groenlandicum) and bearberry (Arctostaphylos uva-ursi) in Alberta.
Known larval hosts include a variety of shrubs in the Betulaceae, Salicaceae, Ericaceae and Rosaceae (Wagner et al. 2001). Associated with Labrador Tea (Ledum groenlandicum) and bearberry (Arctostaphylos uva-ursi) in Alberta.
Range
A northern species, found from Alaska and NWT south to New England, south in the mountains to CA, NV and CO (Ferguson 1985). In Alberta it occurs throughout the boreal and foothills regions, and locally in the aspen…
A northern species, found from Alaska and NWT south to New England, south in the mountains to CA, NV and CO (Ferguson 1985). In Alberta it occurs throughout the boreal and foothills regions, and locally in the aspen parkland south to the Rumsey area.
Mesothea incertata
Mesothea incertata
Mesothea incertata

Citation

Page Citation for Mesothea incertata

Page Citation

"Mesothea incertata, University of Alberta E.H. Strickland Entomological Museum." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/2-3789. Accessed 19 Sep. 2021.

Taxonomic Hierarchy

Kingdom Animalia Phylum Arthropoda Class Hexapoda Subclass Insecta Order Lepidoptera Suborder Ditrysia Superfamily Geometroidea Family Geometridae Subfamily Geometrinae Tribe Hemitheini Genus Mesothea Species Mesothea incertata
This hierarchy is created from our museum records, it may not always accurately reflect modern taxonomies.

Taxonomic Hierarchy for University of Alberta E.H. Strickland Entomological Museum