Platycerus marginalis

Members of Platycerus can be distinguished from other North American stag beetles by their relatively small size, compact body form, and reduced mandibles that are not strongly sexually dimorphic. Platycerus marginalis specifically may be separated from congeners by subtle differences in elytral sculpture and marginal characters, though precise identification requires examination of male genitalia. The species lacks the prominent antler-like mandibles characteristic of larger lucanids.

Associated with aspen (Populus tremuloides) and related deciduous trees in forested and riparian environments. Found in montane and boreal regions where suitable host trees occur.

Western North America: Canada (Alberta, British Columbia, Manitoba, Northwest Territories, Saskatchewan) and United States (Arizona, California, Idaho, Montana, Nevada, Oregon, Utah, Washington, Wyoming).

• Populus tremuloides - larval developmentcommon name: quaking aspen; inferred from common name and genus-level biology

• Platycerus virescensOverlaps in eastern portion of range; distinguished by subtle differences in coloration and male genitalia structure
• Lucanus spp.Larger North American stag beetles with dramatically enlarged mandibles in males; Platycerus marginalis is smaller with reduced mandibles

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