Moths of North Carolina
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99 NC Records

Thyridopteryx ephemeraeformis (Haworth, 1803) - Evergreen Bagworm Moth

Thyridopteryx ephemeraeformis
view caption 		Thyridopteryx ephemeraeformisThyridopteryx ephemeraeformis
view caption 		Thyridopteryx ephemeraeformis
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Taxonomy
Superfamily:
Tineoidea		 Family:
Psychidae		Subfamily:
Oiketicinae		Tribe:
[Oiketicini]		P3 Number:
300015.53		 MONA Number:
457.00		 Other Common Names:
Belted Clearwing, Common Basket Worm, Eastern Bagworm, Common Bagworm, North American Bagworm
Comments: The family Psychidae contains as many as 1,350 species that are found worldwide. The females of many species are flightless, and the larvae of all species live in constructed cases or bags, hence the name bagworms. There are 28 species in North America, including five species of Thyridopteryx.
Species Status: Thyridopteryx ephemeraeformis can often reach high densities on host plants and can become a defoliating pest on woody ornamentals.
Identification
Field Guide Descriptions: Covell (1984)Online Resources: MPG, BugGuide, iNaturalist, Google, BAMONA, GBIF, BOLDTechnical Description, Adults: Davis (1964)Technical Description, Immature Stages: Peterson, 1969                                                                                 
Adult Markings: This species is difficult to confuse with any other species. The body of the male has a woolly appearance from long, dark, dense scales that cover the head, thorax, and abdomen. Those on the abdomen often wear away to varying degrees with time. The antenna is broadly lanceolate with a broad base that tapers to a fine tip. Both the forewing and hindwing are almost devoid of scales except for concentrations along the costal margin and the anal area (Davis, 1964). The exposed wing membrane is transparent. The wingless females live in distinctive bags that are 30-50 mm long and 10-15 mm in diameter, with the greatest diameter at or near the middle. The bag consists of a silk lining that is covered with plant material. The ornamentation is variable depending on the food plant, but the bag never has an external sheet of silk like certain other psychids (Davis, 1964). When pieces of stems are incorporated, they are applied longitudinally and usually are of moderate length (15 mm or less in most cases). On cedars, the cases are frequently adorned with the fruit of the host.
Wingspan: 17.5-36 mm for males; 20-24 mm for females (Davis, 1964).
Adult ID Requirements: Identifiable from good quality photos of unworn specimens.
Immatures and Development: Mating occurs in the late summer or early fall, and the female lays overwintering eggs inside her bag. The larvae hatch in late spring or early summer, and they often balloon on silken threads to nearby host plants, particularly if the resident plant is defoliated or of poor quality (Rhainds et al. 2009). Hatchlings construct bags that are adorned with plant material and/or organic debris and enlarge them as they grow. Upon completion of feeding, the larva tightly attaches the anterior portion of its bag onto a substrate. Pupation occurs within the bag, and the male emerges from the caudal end of the bag. The wingless females remain in their bags and attract males by releasing pheromones. Males insert their abdomens into the bags to mate. After ovipositing on their shed pupal cases, most females drop from their bags and die shortly thereafter (Peterson, 1969). The late-instar larva has a blackish body, with the head and thoracic segments mottled with black-and-white markings and reticulations. The large, dorsolateral white marks on the thorax usually have a single black dot in each mark. The larvae might be confused with Abbot's Bagworm Moth (Oiketicus abbotii) in coastal areas, but the latter has the marks on the thorax better organized as three irregular, longitudinal stripes, with the dorsolateral white marks lacking a black spot in each mark as seen in T. ephemeraeformis.
Larvae ID Requirements: Identifiable from good quality photos, especially where associated with known host plants.
Distribution in North Carolina
Distribution: Thyridopteryx ephemeraeformis occurs in the eastern half of North America southward to northern South America. In North America, it occurs in Ontario and throughout most of the eastern and central US. It occurs statewide In North Carolina, but appears to be rare or absent from the higher elevations in the mountains.
County Map: Clicking on a county returns the records for the species in that county.
Thyridopteryx ephemeraeformis
Flight Dates:
 High Mountains (HM) ≥ 4,000 ft.
 Low Mountains (LM) < 4,000 ft.
 Piedmont (Pd)
 Coastal Plain (CP)

Click on graph to enlarge
Immature 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: Local populations are univoltine, with mating occurring in late summer or early fall. Most of our records for males are from July through early October.
Habitats and Life History
Habitats: The larvae are polyphagous, but are most commonly found on evergreen conifers, particularly Eastern Red Cedar and Southern Red Cedar. Eastern Red Cedar is a successional species that is common in abandoned fields, and along fence rows and roadways. Southern Red Cedar is found along the coast where it grows in maritime forests as well as more open habitats such as dunes and shell middens. These species generally prefer areas with high soil pH.
Larval Host Plants: The larvae are extremely polyphagous and are known to feed on members of over 50 families of plants, including numerous deciduous and evergreen trees and shrubs (Rhainds et al., 2009). They show a strong preference for evergreen conifers, including Eastern Red Cedar (Juniperus virginiana), Southern Red Cedar (J. salicicola), and ornamentals such as Leyland Cypress (Cupressus × leylandii) and Arborvitae (Thuja spp.). In North Carolina, larval bags have been recorded on countless different plants, with confirmed feeding records from Eastern Red Cedar and Box-elder (Acer negundo). - View
Observation Methods: The males occasionally visit lights, and the bags are easily spotted on the host plants such as Eastern Red Cedar and Southern Red Cedar.
Wikipedia
Status in North Carolina
Natural Heritage Program Status:
Natural Heritage Program Ranks: GNR [S5]
SPE: 0
State Protection: Has no legal protection, although permits are required to collect it on state parks and other public lands.
Comments: This species is often locally common and can become a pest on ornamentals. It appears to be secure within the state.

 Photo Gallery for Thyridopteryx ephemeraeformis - Evergreen Bagworm Moth

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

Recorded by: Mark Basinger on 2024-12-08
Brunswick Co.
Comment: 		Recorded by: Dean Furbish and Joy Wiggins on 2024-10-29
Pender Co.
Comment:
Recorded by: Dean Furbish on 2024-10-28
Pender Co.
Comment: 		Recorded by: John Petranka on 2024-09-14
Orange Co.
Comment:
Recorded by: R. Newman on 2024-09-10
Carteret Co.
Comment: 		Recorded by: R. Newman on 2024-08-26
Carteret Co.
Comment:
Recorded by: Lior S. Carlson, Dean Furbish on 2024-06-18
Lincoln Co.
Comment: 		Recorded by: Mark Basinger on 2024-06-18
Brunswick Co.
Comment:
Recorded by: Mark Basinger on 2024-06-18
Brunswick Co.
Comment: 		Recorded by: Mark Basinger on 2024-05-19
Rowan Co.
Comment:
Recorded by: Mark Basinger on 2024-04-28
Brunswick Co.
Comment: 		Recorded by: David George, Jeff Niznik, Rich Teper on 2024-04-17
New Hanover Co.
Comment:
Recorded by: Dean Furbish on 2024-03-12
Wake Co.
Comment: 		Recorded by: Mark Basinger and Donald Zepp on 2024-02-22
Greene Co.
Comment:
Recorded by: Mark Basinger on 2024-01-08
Wilson Co.
Comment: Cocoon found on Morella cerifera in loblolly pine forest.		Recorded by: Mark Basinger on 2023-11-24
Brunswick Co.
Comment: Numerous on cultivated juniper with blue-green foliage.
Recorded by: Mark Basinger on 2023-11-24
Brunswick Co.
Comment: 		Recorded by: Dean Furbish on 2023-10-23
Pender Co.
Comment:
Recorded by: Stephen Dunn on 2023-10-17
Orange Co.
Comment: 		Recorded by: R. Newman on 2023-09-30
Carteret Co.
Comment:
Recorded by: R. Newman on 2023-09-05
Carteret Co.
Comment: 		Recorded by: Stephen Dunn on 2023-09-03
Orange Co.
Comment:
Recorded by: David George on 2023-09-01
Chatham Co.
Comment: 		Recorded by: Stephen Dunn on 2023-08-08
Orange Co.
Comment:
Recorded by: David George on 2023-07-18
Durham Co.
Comment: 		Recorded by: David George on 2023-05-02
Carteret Co.
Comment:
Recorded by: David George on 2023-05-01
Lenoir Co.
Comment: 		Recorded by: Dean Furbish on 2023-05-01
Pender Co.
Comment:
Recorded by: David George, Stephen Dunn, Jeff Niznik on 2023-04-19
Orange Co.
Comment: 		Recorded by: David George on 2023-04-13
Durham Co.
Comment: