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Species Details

Digrammia setonana

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

SeasonalityNo Alberta data; elsewhere adults fly in June (McGuffin 1972). IdentificationA mid-sized, grey geometrid with black antemedian (AM) and post-median (PM) lines across the forewing. The dark wedges along the forewing costa typical of the genus are poorly defined in setonana. Similar to D. decorata, D. curvata and D. rippertaria, which also have the black, even forewing transverse lines. Habitat and distribution will narrow down species identity, but genitalic dissection is necessary to confirm identification; see McGuffin (1972) for genitalic keys and illustrations.

Scientific Name Digrammia setonana Habitat Montane coniferous woods. Seasonality No Alberta data; elsewhere adults fly in June (McGuffin 1972). Identification
A mid-sized, grey geometrid with black antemedian (AM) and post-median (PM) lines across the forewing. The dark wedges along the forewing costa typical of the genus are poorly defined in setonana. Similar to D.…
A mid-sized, grey geometrid with black antemedian (AM) and post-median (PM) lines across the forewing. The dark wedges along the forewing costa typical of the genus are poorly defined in setonana. Similar to D. decorata, D. curvata and D. rippertaria, which also have the black, even forewing transverse lines. Habitat and distribution will narrow down species identity, but genitalic dissection is necessary to confirm identification; see McGuffin (1972) for genitalic keys and illustrations.
Life History
McGuffin (1972) gives a detailed description of the immature stages. The larvae are remarkable mimics of juniper twigs, complete with intricate green and white markings resembling leaf scales. In BC, this species is…
McGuffin (1972) gives a detailed description of the immature stages. The larvae are remarkable mimics of juniper twigs, complete with intricate green and white markings resembling leaf scales. In BC, this species is able to overwinter in either the egg or pupal stage, flying in June or September (Duncan 2003).
Conservation Very localized distribution in Alberta, found only in association with the host. Diet Info
Larvae feed on Rocky Mountain Juniper (Juniperus scopulorum), occasionally also on Western Red Cedar (Thuja plicata); the paucity of records on cedar and the absence of setonata records over most of the range of…
Larvae feed on Rocky Mountain Juniper (Juniperus scopulorum), occasionally also on Western Red Cedar (Thuja plicata); the paucity of records on cedar and the absence of setonata records over most of the range of Western Red Cedar suggests that cedar is not a regular host.
Range Southern BC south to UT and CA. In Alberta, known only from the Crowsnest Pass (Prentice 1963).

Citation

Page Citation for Digrammia setonana

Page Citation

"Digrammia setonana, University of Alberta E.H. Strickland Entomological Museum." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/2-4583/9-194540. Accessed 19 Sep. 2021.

Taxonomic Hierarchy

Kingdom Animalia Phylum Arthropoda Class Hexapoda Subclass Insecta Order Lepidoptera Suborder Ditrysia Superfamily Geometroidea Family Geometridae Subfamily Ennominae Tribe Semiothisini Genus Digrammia Species Digrammia setonana
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