Pyromorpha dimidiata
Herrich-Schäffer, 1854
Orange-patched Smoky Moth
Pyromorpha dimidiata is a leaf skeletonizer in the Zygaenidae, native to eastern North America. display distinctive orange and dark gray forewings with a pattern that resembles toxic net-winged beetles (Calopteron spp.) in a Müllerian mimicry complex. All life stages contain hydrogen cyanide, which the moth synthesizes independently rather than sequestering from plants. The is active primarily in spring and early summer.
Pronunciation
How to pronounce Pyromorpha dimidiata: /paɪroʊˈmɔrfə ˌdɪmɪˈdaɪətə/
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Identification
Forewings divided into two solid color regions: orange in the basal half (except near inner margin) and dark gray to black in the terminal half (extending into basal area near inner margin), sometimes with blue sheen. Hindwings uniformly dark. Wings held horizontally over at rest. Distinguished from similar Lycomorpha pholus (black-and-yellow lichen moth, Erebidae) by black hind margin of forewing and earlier period (L. pholus appears late summer). Both resemble net-winged beetles (Calopteron spp.) and require close examination to separate from beetles.
Images
Habitat
Mature deciduous forests, particularly white oak (Quercus alba) forests. Associated with oak-dominated woodlands in mesic conditions.
Distribution
Eastern North America: from Mississippi, Oklahoma, and Missouri westward to Florida, New York, and Rhode Island eastward.
Seasonality
reported March through August, with peak activity in May and June.
Diet
Larvae feed on leaf litter, particularly decomposing oak leaves.
Life Cycle
Larval stage feeds on leaf litter. and timing corresponds with spring-early summer period. Specific details of and pupal stages not documented in available sources.
Ecological Role
Participant in Müllerian mimicry complex with net-winged beetles ( Lycidae), specifically Calopteron terminale and related . from hydrogen cyanide serves as chemical defense against . Contributes to leaf litter decomposition as larva.
Similar Taxa
- Lycomorpha pholusSimilar two-toned orange-and-black forewing pattern, but has yellow (not black) hind margin of forewing and flies in late summer rather than spring-early summer. Unrelated in Erebidae.
- Calopteron terminaleNet-winged beetle ( Lycidae) that shares orange-and-black warning coloration; both participate in Müllerian mimicry complex. has hardened forewings () and different body shape.