Acmaeops discoideus
(Haldeman, 1847)
Acmaeops discoideus is a flower longhorn beetle ( Lepturinae) distributed across the United States and Canada. The feeds on Virginia pine (Pinus virginiana) as a larva, boring in the wood of this conifer . are active during autumn and have been observed into December in some regions. The species was formerly spelled A. discoidea, but A. discoideus is now the accepted name.
Pronunciation
How to pronounce Acmaeops discoideus: /ækˈmiːɒps dɪˈskɔɪdiˌuːs/
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Identification
are small to medium-sized longhorn beetles with relatively short compared to many cerambycids. The can be distinguished from similar flower longhorns by association with its specific conifer , Virginia pine, and by geographic range. The are typically somewhat flattened and may show subtle sculpturing.
Habitat
Associated with Virginia pine (Pinus virginiana) forests. Larvae develop in the wood of living or recently dead Virginia pine. are found on or near trees.
Distribution
Eastern North America. Documented from the United States and Canada, with records from New Brunswick, Nova Scotia, and Québec in Canada.
Seasonality
are active in autumn, with observations extending into December. This late-season activity pattern is unusual among cerambycids and represents an adult stage.
Diet
Larvae feed on the wood of Virginia pine (Pinus virginiana). Specific feeding habits are not documented in available sources.
Host Associations
- Pinus virginiana - larval Virginia pine; larvae bore in wood of living or recently dead trees
Life Cycle
Larvae bore in the wood of Virginia pine. occurs under bark in lined with and wood shavings. emerge in autumn and overwinter, becoming active again in early spring. This pattern— as adults rather than larvae—is unusual among North American cerambycids.
Ecological Role
As a wood-boring , larvae contribute to the decomposition of Virginia pine wood and nutrient cycling in coniferous forest . The is a primary consumer of living or recently dead pine tissue.
Human Relevance
Minor significance. Not known to be a major pest of timber or ornamental plantings. May be encountered by entomologists and naturalists during late-season collecting.
Similar Taxa
- Rhagium inquisitorAlso a lepturine with active in late season, but R. inquisitor has heavily ribbed , big-shouldered build, and shorter ; uses Pinus and other conifers but not specifically Virginia pine
- Other Acmaeops speciesSeveral congeneric occur in similar ; precise identification requires examination of subtle morphological characters and association
- Crossidius discoideusDifferent but similar name; C. discoideus is a flower-visiting cerambycid in Cerambycinae with different color pattern and , associated with Gutierrezia flowers rather than conifers