Notocelia illotana

Distinguished from similar Notocelia species by subtle differences in forewing pattern and genitalia; reliable identification requires dissection and examination of male genitalic structures, particularly the shape of the valva and aedeagus. Externally similar to Notocelia cynosbatella and Notocelia trimaculana, but illotana tends to show less distinct maculation and a more uniform ground color. In the field, specimens from the western Canadian range are most likely to be confused with other prairie-dwelling Eucosmini; genitalic examination is necessary for definitive identification.

Adults are small moths with wingspan approximately 12–16 mm. Forewings are narrow, somewhat elongate, and colored in muted shades of gray-brown with indistinct darker fasciae or mottling. The wing pattern lacks strong contrasting markings typical of some related tortricids. Hindwings are pale grayish, narrower than forewings, with fringed margins. Antennae are filiform and approximately half the body length. Labial palps are relatively short, curved upward.

Associated with open habitats in the prairie provinces, including grasslands, meadows, and edges of aspen parkland. Larval host plants are unconfirmed but likely include herbaceous or shrubby Rosaceae based on related species.

Recorded from Alberta, Manitoba, and Saskatchewan in Canada. The species appears restricted to the northern Great Plains region. Distribution records suggest it may be endemic to or most abundant in the Canadian prairie provinces, though survey gaps in adjacent regions may affect this interpretation.

Adults have been recorded from June to August, with peak activity likely in July. The univoltine life cycle is inferred from related species, but specific phenology data are sparse.

Complete metamorphosis with egg, larva, pupa, and adult stages. Larval biology is undocumented; related Notocelia species are internal feeders in stems, fruits, or roots of Rosaceae. Pupation likely occurs in soil or within the host plant.

Adults are nocturnal and attracted to light. Daytime resting posture is typical of Tortricidae, with wings held roof-like over the body.

As a probable internal feeder in larval stage, may contribute to nutrient cycling in prairie ecosystems and serve as prey for parasitoid wasps and other insectivores.

No documented economic importance. Occasionally collected in light trap surveys and biodiversity inventories.

• Notocelia cynosbatellaOverlaps in range and general appearance; distinguished by more distinct forewing markings and different male genitalia.
• Notocelia trimaculanaSimilar size and coloration; trimaculana typically shows three more prominent dark spots on the forewing and has different genitalic structure.
• Pelochrista speciesMany Pelochrista in the same region are similar in size and color; genitalic examination required for separation.

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