Calopteron discrepans
(Newman, 1838)
banded net-winged beetle
Calopteron discrepans is a colorful net-winged beetle in the Lycidae, recognized by its striking orange with black banding. The occurs in moist woodland across eastern North America, where are active during summer months. It is frequently confused with C. reticulatum and C. terminale, requiring careful examination of antennal and coloration for positive identification. The species participates in Müllerian mimicry complexes with other aposematically colored insects.
Pronunciation
How to pronounce Calopteron discrepans: /kæˈlɒptərɒn dɪˈskriːpænz/
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Identification
Distinguished from Calopteron reticulatum by black metasternum (versus reddish-brown antero-medially in C. reticulatum) and black or fulvous second antennal segment (versus fulvous or brown in C. reticulatum). Distinguished from C. terminale by presence of black band on (typically absent in C. terminale) and non-wavy elytral profile when viewed laterally. C. terminale lacks the sutural extension of the median band toward the elytral bases.
Images
Habitat
Primarily moist deciduous woodlands. Larvae inhabit microhabitats within rotten logs, under loose bark, in soil, or within leaf litter. are found on vegetation and flowers.
Distribution
Eastern United States, ranging from New England south to Florida and west to Oklahoma and Kansas. Range has expanded northward in recent decades, with records from Manitoba, Ontario, and Québec, Canada.
Seasonality
active during summer months (June–August), with peak activity varying by latitude.
Diet
Larvae have been reported as predacious on small arthropods, or feeding on myxomycetes, fungi, or fermenting plant juices—dietary habits remain incompletely resolved. feed on nectar and possibly honeydew from aphids.
Life Cycle
Complete with , larval, pupal, and stages. Larvae develop in decaying wood substrates. occurs within the last instar larval . Larvae aggregate in large shingled masses of hundreds of individuals during pupation, a believed to provide communal defense and microclimate regulation.
Behavior
Larvae form large during , with masses containing hundreds of pupae. exhibit elytral raising and lowering displays. When threatened, adults release noxious defensive fluid from leg joints (reflex-bleeding).
Ecological Role
Larvae contribute to decomposition of wood and nutrient cycling in forest . Potential roles as of small arthropods and as fungal spore dispersers. may serve as of flowering plants.
Human Relevance
Serves as a model organism for studies of Müllerian mimicry and aposematic coloration. No significant economic impact; not considered a pest. Attracts attention due to bright coloration.
Similar Taxa
- Calopteron reticulatumNearly identical elytral pattern; distinguished by reddish-brown antero-medial metasternum and fulvous second antennal segment
- Calopteron terminaleSimilar size and general form; distinguished by lack of elytral band and wavy elytral profile in lateral view
More Details
Defensive chemistry
Like other lycids, C. discrepans possesses brittle elytral ridges that rupture to release defensive compounds. Contains pyrazines contributing to repugnant odor, and lycidic acid and other that render beetles distasteful to .
Mating behavior
Mating pairs have been observed near pupal , but direct mating on pupal masses has not been documented. Male attendance to pupae appears minimal; function of aggregations in mating facilitation remains unclear.