Exema canadensis
This record describes Exema canadensis (species). Recorded family: Chrysomelidae. Recorded order: Coleoptera.
Identification and Appearance
Emargination of eyes black, not yellow. Shiny black with yellowish markings; male with antennal scape and longitudinal bar next to each eye transversely connected to central spot that merges with triangular frontal spot, yellow; frontal slope black; all tibiae with subbasal and subapical yellow rings; front femora with basal yellow ring, female similar with facial yellow markings reduced to spots; pronotum with large elliptical punctures, largest posteriorly; elytra coarsely punctate with prominent umbone and large tubercules.
Classification
- Kingdom
- Animalia
- Phylum
- Arthropoda
- Class
- Insecta
- Order
- Coleoptera (Beetles)
- Suborder
- Polyphaga
- Superfamily
- Chrysomeloidea
- Family
- Chrysomelidae (Leaf Beetles)
- Subfamily
- Cryptocephalinae
- Tribe
- Fulcidacini
- Genus
- Exema
Imported taxonomy record. Source availability varies; see the source references and editorial policy below.
Habitat and Range
Habitat
Beaten and swept from species of Solidago, Corylus, Salix, Cornus , elm, chokecherry, blackberry, ragweed, and others.
Geographic Range
e NA (TX-FL-NS-MB) - Map
Additional species information
Species notes from the sources
Etymology: Exema canadensis Pierce, 1940
About Primitive Winged Insects: the wider group
Order-level background for Coleoptera, the group containing Exema canadensis. Species-specific details appear above.
Group overview
Coleoptera is the largest order of insects with over 400,000 described species, representing ~25% of all known animal species and ~40% of all insects. In the U.S. alone, nearly 30,000 beetle species have been identified.
Ecological role of the group
Beetles are prominent decomposers, especially in forests, breaking down dead wood and recycling nutrients. As predators, they reduce populations of pest insects. Many species are also important pollinators of flowering plants.
Economic and practical significance of the group
Beetles have major economic significance: leaf beetles (Chrysomelidae) and weevils (Curculionoidea) are among the most destructive agricultural pests globally, costing billions annually, while predatory species like ladybugs provide natural pest control.
Recorded sources for this group: Britannica, Smithsonian, NCSU Entomology. Imported estimates may describe particular regions or reporting periods.
Photos of Exema canadensis (2)
Photo credits: Contributed by Cotinis; Additional contributions by Bbarnd , Mike Quinn , Ben Coulter
Frequently Asked Questions About Exema canadensis
What is Exema canadensis?
Exema canadensis is a species in the family Chrysomelidae, within the order Coleoptera.
How big is Exema canadensis?
2.4 to 2.7 mm
How do you identify Exema canadensis?
Emargination of eyes black, not yellow. Shiny black with yellowish markings; male with antennal scape and longitudinal bar next to each eye transversely connected to central spot that merges with triangular frontal spot, yellow; frontal slope black; all tibiae with subbasal and subapical yellow rings; front femora with basal yellow ring, female similar with facial yellow markings reduced to spots; pronotum with large elliptical punctures, largest posteriorly; elytra coarsely punctate with prominent umbone and large tubercules.
Where is Exema canadensis found?
| Feature | Details |
|---|---|
| Habitat | Beaten and swept from species of Solidago, Corylus, Salix, Cornus , elm, chokecherry, blackberry, ragweed, and others. |
| Range | e NA (TX-FL-NS-MB) - Map |