Myllaena cuneata

Members of Myllaena can be distinguished from other aleocharine rove beetles by their small size (typically 2–3 mm), compact oval body shape, and notably reduced wing venation with fewer veins than typical for the subfamily. Within the genus, M. cuneata is distinguished by the wedge-shaped (cuneate) apex of the aedeagus, which gives the species its name. The specific shape of the spermatheca and details of the male genitalia are required for definitive identification to species level.

Specific habitat associations for M. cuneata are poorly documented. Records span diverse environments including forested areas, wetlands, and coastal hammocks. The genus Myllaena as a whole is associated with decaying organic matter, including leaf litter, rotting wood, and fungal substrates.

Eastern and central North America. Documented from Canada (Alberta, Nova Scotia, Ontario) and the United States (Arkansas, Florida, Georgia, Illinois, Louisiana, Massachusetts, Maryland, New Hampshire, Oklahoma, Tennessee, Virginia).

As a member of the Staphylinidae, M. cuneata likely contributes to decomposition processes in soil and leaf litter communities. The genus Myllaena has been associated with fungal feeding in some species, though this has not been specifically documented for M. cuneata.

• Myllaena speciesOther species in the genus require dissection and examination of genitalia for separation; M. cuneata is distinguished by the wedge-shaped aedeagal apex.
• Other Aleocharinae generaMyllaena is distinguished by reduced wing venation and compact body form; other aleocharines typically have more complete wing venation and more elongate bodies.

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