Moths of North Carolina

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View PDF	Depressariidae Members:	Agonopterix Members:	79 NC Records

Agonopterix thelmae Clarke, 1941 - Thelma's Agonopterix

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Taxonomy

Superfamily:
Gelechioidea

Family:
Depressariidae

Subfamily:
Depressariinae

Tribe:
[Depressariini]

P3 Number:
59a0097

MONA Number:
884.00

Comments: Agonopterix is a large holarctic genus with more than 125 species, with most occurring in the Palearctic Region. Currently, there are 47 recognized species in North America. Our species are largely confined to the western mountains.

Identification

Field Guide Descriptions:

Online Resources: MPG, BugGuide, iNaturalist, Google, BAMONA, GBIF, BOLD

Technical Description, Adults: Clarke (1941); Hodges (1974)

Adult Markings: The following is based primarily on descriptions in Clarke (1941) and Hodges (1974). The labial palp is whitish ochreous, with the second segment irrorated exteriorly with reddish fuscous. The third segment has a blackish-fuscous sub-basal and supra-medial band. The antenna has a whitish ochreous basal segment that is indistinctly annulated with fuscous basally. The whitish ochreous section grades towards fuscous in the apical third. The head, thorax, and ground color of the forewing are whitish ochreous, and the thorax and forewing are speckled with fuscous and suffused with dull reddish. There is a fuscous spot on each side of the thorax beneath the inner edge of the tegula. A narrow fuscous line is usually evident just beyond the light basal area that extends to the costa. At the basal third there are two diagonal blackish-fuscous discal spots. The latter is just above an orange-red streak on the cell, which has a third dark spot at its terminus (sometimes inconspicuous). A somewhat rounded, diffuse dark blotch is present between the orange-red streak and the costa. A diffuse, brownish, longitudinal band usually adjoins the streak on the inner side. The band often extends both anteriorly and posteriorly beyond the streak. The portion that extends posteriorly eventually curves towards the inner margin, then sharply angles back towards the apex. A series of indistinct fuscous spots occurs along the costa and around the termen. The cilia are whitish ochreous with a reddish tint. The hindwing is fuscous with cilia that are whitish ochreous and banded with fuscous. The legs are whitish ochreous and suffused and irrorated with reddish fuscous except at the joints. Two features that help to distinguish this species are the red to reddish-orange streak along the cell, and the dark blotch between the streak and the costa.

Agonopterix robiniella is superficially similar, but lacks the reddish-orange streak along the cell and has a curved, diffuse band that extends from the mid-costal region towards the inner margin of the wing base. Agonopterix thelmae also lacks a brick-red sub-basal annulus on the third segment of the labial palpus that is present in A. robiniella. Agonopterix dimorphella also superficially resembles A. thelmae), but is darker and smaller, lacks the reddish-orange streak, and has a pale yellow spot at the end of the cell.

Wingspan: 17-25 mm (Clarke, 1941).

Forewing Length: 7.3-11.3 mm (Hodges, 1974).

Adult Structural Features: Clarke (1941) provides detailed descriptions and illustrations of the male and female genitalia, and Hodges (1974) discusses genitalic differences that are useful in distinguishing A. robiniella from A. thelmae. In particular, males of A. robiniella have the transtilla slightly indented medially, whereas it is uniformly broad in A. thelmae. In A. robiniella the heavily sclerotized costal margin of the sacculus usually is equal to the length of the process, whereas in A. thelmae it is 1/4 to 1/3 longer than the process. In the female, the anterior margin of the eight abdominal sternum is straight in A. robiniella, while in A. thelmae it bears a rounded medial projection.

Structural photos

Adult ID Requirements: Identifiable from good quality photos of unworn specimens.

Immatures and Development: The larval life history is undocumented.

Distribution in North Carolina

Distribution: Agonopterix thelmae is found in eastern North America in southern Canada (Ontario; Quebec; Nova Scotia; New Brunswick), and from the northeastern states westward and southwestward to Iowa, Illinois, Kentucky, Tennessee, and western North Carolina. This species is absent from most of the southeastern Piedmont and Coastal Plain. As of 2023, our records are all from the Blue Ridge,

County Map: Clicking on a county returns the records for the species in that county.


Flight Dates: High Mountains (HM) ≥ 4,000 ft. Low Mountains (LM) < 4,000 ft. Piedmont (Pd) Coastal Plain (CP) Click on graph to enlarge
Flight Comments: This species is univoltine. Adult have been found from June through November in different areas of the range, with a peak in numbers from August to October. As of 2023, our records extend from early-July through early-November.

Habitats and Life History

Habitats: The hosts and specific habitat requirements are unknown. Many of our records are from wooded, residential neighborhoods.

Larval Host Plants: The hosts are poorly documented. Hodges (1974) surmised that this species may use legumes since it is closely related to A. robiniella. There is a BugGuide record of a larva feeding on Black Locust (Robinia pseudoacacia), but we do not have any feeding records in North Carolina. - View

Observation Methods: The adults are attracted to lights.

Wikipedia

Status in North Carolina

Natural Heritage Program Status:

Natural Heritage Program Ranks: GNR SU

State Protection: Has no legal protection, although permits are required to collect it on state parks and other public lands.

Comments: As of 2020 we have 15 site records for the western mountains which suggests that this species is somewhat secure. Additional information is needed on its distribution and abundance before we can accurately assess its conservation status.

Photo Gallery for Agonopterix thelmae - Thelma's Agonopterix

40 photos are available. Only the most recent 30 are shown.

	Recorded by: Jim Petranka on 2024-10-22 Madison Co. Comment:		Recorded by: Jim Petranka on 2024-10-03 Madison Co. Comment:
	Recorded by: David George, Jeff Niznik on 2024-08-06 Transylvania Co. Comment:		Recorded by: Jim Petranka on 2023-11-09 Madison Co. Comment:
	Recorded by: Owen McConnell on 2023-10-25 Graham Co. Comment:		Recorded by: Owen McConnell on 2023-10-01 Graham Co. Comment:
	Recorded by: Jim Petranka, Bo Sullivan and Becky Elkin on 2023-09-15 Macon Co. Comment:		Recorded by: Jim Petranka, Bo Sullivan and Becky Elkin on 2023-09-14 Macon Co. Comment:
	Recorded by: David George, Stephen Dunn, Jeff Niznik on 2023-07-31 Macon Co. Comment:		Recorded by: David George, Stephen Dunn, Jeff Niznik, Rich Teper, Becky Watkins on 2023-07-30 Swain Co. Comment:
	Recorded by: David George, Rich Teper on 2023-07-30 Swain Co. Comment:		Recorded by: David George, Stephen Dunn, Jeff Niznik, Rich Teper, Becky Watkins on 2023-07-29 Swain Co. Comment:
	Recorded by: Jim Petranka on 2022-11-05 Madison Co. Comment:		Recorded by: Jim Petranka on 2022-10-24 Madison Co. Comment:
	Recorded by: Jim Petranka on 2022-10-16 Madison Co. Comment:		Recorded by: Jim Petranka on 2022-10-15 Madison Co. Comment:
	Recorded by: John Petranka on 2022-08-08 Watauga Co. Comment:		Recorded by: Jim Petranka on 2021-10-24 Madison Co. Comment:
	Recorded by: Jim Petranka on 2021-10-14 Madison Co. Comment:		Recorded by: Jim Petranka on 2021-10-09 Madison Co. Comment:
	Recorded by: tom ward on 2021-10-04 Buncombe Co. Comment:		Recorded by: Stephen Hall on 2021-09-13 Ashe Co. Comment:
	Recorded by: Jim Petranka on 2020-11-10 Madison Co. Comment:		Recorded by: Jim Petranka and Becky Elkin on 2020-09-23 Madison Co. Comment:
	Recorded by: Jim Petranka and Becky Elkin on 2020-09-13 Madison Co. Comment:		Recorded by: Owen McConnell on 2019-10-15 Graham Co. Comment:
	Recorded by: Jim Petranka and Becky Elkin on 2019-09-26 Madison Co. Comment:		Recorded by: Jim Petranka and Becky Elkin on 2019-09-23 Madison Co. Comment:
	Recorded by: Jim Petranka and Becky Elkin on 2019-09-10 Madison Co. Comment:		Recorded by: Jim Petranka and Becky Elkin on 2019-09-09 Madison Co. Comment: