Moths of North Carolina
Scientific Name:
Common Name:
Family (Alpha):
« Home »
View PDFTischeriidae Members: Coptotriche Members: 7 NC Records

Coptotriche fuscomarginella (Chambers, 1875) - No Common Name


Coptotriche fuscomarginella
view caption
Coptotriche fuscomarginella
view caption
Coptotriche fuscomarginella
view caption
Coptotriche fuscomarginella
view caption
Taxonomy
Superfamily:
Tischerioidea
Family:
Tischeriidae
P3 Number:
23a0032
MONA Number:
139.00
Comments: Coptotriche is a genus of specialized leafminers that currently consists of 27 recognized Nearctic species. Most species fall within one of two major groups. Members of the first group typically have orangish to yellowish forewings (rarely white) and specialize on oaks and chestnuts, while members of the second group have dark gray, brown, or blackish forewings and mostly feed on members of the Rosaceae (Braun, 1972; Eiseman, 2019).
Identification
Field Guide Descriptions: Online Resources: MPG, BugGuide, iNaturalist, Google, BAMONA, GBIF, BOLDTechnical Description, Adults: Braun (1972)Technical Description, Immature Stages: Braun (1972); Eiseman (2019).                                                                                 
Adult Markings: The following is from Braun's (1972) description based on studies of 15 specimens from throughout the range of the species. The face, the forward projecting scales of the tuft, and the antennal scape are all white, while the crown varies from whitish to ocherous. The forewing is typically reddish ocherous, but sometimes paler, while the costal margin, the apical fourth of the wing, and the outer half of the dorsal margin are reddish fuscous. The scales in the apical fourth are dark-tipped. Dark specimens have a purplish tinge in the outer half of the costal margin where the line of dark scales widens. The cilia are typically reddish ocherous, but are more reddish fuscous in dark specimens. They become paler toward the tornus only in pale specimens. The hindwing is very narrow, pale ocherous, and usually has a reddish tinge. The cilia are reddish ocherous. The legs are pale ocherous, and the posterior tarsi are shaded with fuscous. The abdomen is pale ocherous, with fuscous dusting beneath and sometimes above.
Wingspan: 6.5-7.0 mm (Braun, 1972).
Adult Structural Features: Braun (1972) provides keys for identifying males and females based on genitalia. Her verbatim descriptions of the genitalia are as follows: vinculum not produced, nearly right-angled; apex of costa of harpe acute, setae long; anellus rounded conical, minutely spined; forks of aedeagus very narrow; forks of uncus widely separated, acuminate. Dorsal margin of segment 8 fringed with very long setae. Female genitalia: ovipositor lobes much larger than the very small lateral lobes, densely clothed with small peg setae; sex opening circular, with lateral sclerotized projections, enlarged portion of ductus bursae not spined, constriction beyond minutely spined, bursa copulatrix minutely tuberculate; posterior apophyses gradually widening to tip; segment 8 not reduced, broad posteriorly, arms of patibulum diverging from segment 8 near the median line, articulating in a swollen area of the anterior apophyses; prela small, short.
Immatures and Development: As a larva mines a leaf, it produces a gradually widening, full-depth tract that is translucent and trumpet-shaped. The frass is retained in the mine and packed in a gradually widening track back toward the beginning of the mine, with only a few scattered particles in the outer area of the mine. A thin silken tube leads from the feeding area to the packed frass track. Pupation usually occurs over a lateral vein in an elongate chamber, with the upper epidermis drawn into many fine folds (Braun, 1972). Eiseman (2019) observed that the pupation chamber is typically torn at each end as Braun described for C. zelleriella.
Distribution in North Carolina
Distribution: Coptotriche fuscomarginella is spottily distributed in the eastern US where it has been documented in Ohio, Kentucky, New York, Massachusetts, New Jersey, Virginia, and the Carolinas (Braun, 1972; Eiseman, 2019). Eiseman (2019) reared specimens from North and South Carolina (localities not reported), and Tracy Feldman reared an adult from a mine collected from Scotland Co.
County Map: Clicking on a county returns the records for the species in that county.
Coptotriche fuscomarginellaAlamance Alexander Alleghany Anson Ashe Avery Beaufort Bertie Bladen Brunswick Buncombe Burke Cabarrus Caldwell Camden Carteret Caswell Catawba Chatham Cherokee Chowan Clay Cleveland Columbus Craven Cumberland Currituck Dare Davidson Davie Duplin Durham Edgecombe Forsyth Franklin Gaston Gates Graham Granville Greene Guilford Halifax Harnett Haywood Henderson Hertford Hoke Hyde Iredell Jackson Johnston Jones Lee Lenoir Lincoln Macon Madison Martin McDowell Mecklenburg Mitchell Montgomery Moore Nash New%20Hanover Northampton Onslow Orange Pamlico Pasquotank Pender Perquimans Person Pitt Polk Randolph Richmond Robeson Rockingham Rowan Rutherford Sampson Scotland Stanly Stokes Surry Swain Transylvania Tyrrell Union Vance Wake Warren Washington Watauga Wayne Wilkes Wilson Yadkin Yancey
Flight Dates:
 High Mountains (HM) ≥ 4,000 ft.
 Low Mountains (LM) < 4,000 ft.
 Piedmont (Pd)
 Coastal Plain (CP)

Click on graph to enlarge
Image showing flight dates by month for High Mountains greater than 4,000 feet, Low Mountains, Piedmont, and Coastal Plain: adults.
Immature Dates:
 High Mountains (HM) ≥ 4,000 ft.
 Low Mountains (LM) < 4,000 ft.
 Piedmont (Pd)
 Coastal Plain (CP)

Click on graph to enlarge
Image showing flight dates by month for High Mountains greater than 4,000 feet, Low Mountains, Piedmont, and Coastal Plain: immatures.
Flight Comments: Based on scattered records from the eastern US, the adults appear to be active from late spring through August.
Habitats and Life History
Habitats: This species is dependent on chestnuts and oaks for reproduction and is presumably restricted to forests or successional habitats with oaks or chestnuts.
Larval Host Plants: The larvae mine the leaves of chestnuts and oaks. Braun (1972) reared Kentucky specimens from American Chestnut (Castanea dentata), Chestnut Oak (Quercus montana) and Chinquapin Oak (Q. muehlenbergii). Eiseman (2019) also listed Bear Oak (Q. ilicifolia), Willow Oak (Q. phellos), and Black Oak (Q. velutina) as hosts. As of 2022, we have three records that are from Blackjack Oak (Q. marilandica) in the Sandhills and Southern Red Oak (Q. falcata) in the mountains. - View
Observation Methods: Coptotriche fuscomarginella appears to be uncommon in North Carolina. Direct searches for the mines beginning in late spring or early summer may be the best way to document local populations. This should be coupled with the rearing of adults. Mine characteristics -- in combination with the presence of dark-tipped scales on the apical fourth of the forewings -- should be sufficient to distinguish this species from other species that mine oaks such as C. zelleriella. Most records from the eastern US are from reared adults, suggesting that this species is not strongly attracted to lights.
Wikipedia
See also Habitat Account for General Oak-Hickory Forests
Status in North Carolina
Natural Heritage Program Status:
Natural Heritage Program Ranks: [GNR] S1S3
State Protection:
Comments:

 Photo Gallery for Coptotriche fuscomarginella - None

Photos: 11
Coptotriche fuscomarginellaRecorded by: Jim Petranka and Becky Elkin on 2022-08-31
Clay Co.
Comment: A reared adult from Southern Red Oak (see companion photos of the mine from 2022-08-25).
Coptotriche fuscomarginellaRecorded by: Jim Petranka and Becky Elkin on 2022-08-31
Clay Co.
Comment: A reared adult from Southern Red Oak (see companion photos of the mine from 2022-08-25).
Coptotriche fuscomarginellaRecorded by: Jim Petranka and Bo Sullivan on 2022-08-28
Richmond Co.
Comment: Unoccupied mines were on Quercus marilandica.
Coptotriche fuscomarginellaRecorded by: Jim Petranka and Bo Sullivan on 2022-08-28
Richmond Co.
Comment: Unoccupied mines were on Quercus marilandica.
Coptotriche fuscomarginellaRecorded by: Jim Petranka and Becky Elkin on 2022-08-25
Clay Co.
Comment:
Coptotriche fuscomarginellaRecorded by: Jim Petranka and Becky Elkin on 2022-08-25
Clay Co.
Comment:
Coptotriche fuscomarginellaRecorded by: Jim Petranka and Bo Sullivan on 2021-08-31
Moore Co.
Comment: An adult that was reared from a mine on Quercus marilandica (see companion photos of the mine from 2021-08-09).
Coptotriche fuscomarginellaRecorded by: Jim Petranka and Bo Sullivan on 2021-08-09
Moore Co.
Comment: Occupied mine was on Quercus marilandica.
Coptotriche fuscomarginellaRecorded by: Jim Petranka and Bo Sullivan on 2021-08-09
Moore Co.
Comment: Occupied mine was on Quercus marilandica.
Coptotriche fuscomarginellaRecorded by: Jim Petranka on 2021-08-09
Richmond Co.
Comment: Unoccupied mine was on Quercus marilandica.
Coptotriche fuscomarginellaRecorded by: Jim Petranka on 2021-08-09
Richmond Co.
Comment: Unoccupied mine was on Quercus marilandica.