Stilicina

Stilicina can be distinguished from related subtribes within Lathrobiini by combinations of characters including antennal structure, pronotal shape, and male genitalia morphology. Specific diagnostic features vary by genus; for example, Rugilus species often show distinctive pronotal punctation patterns, while Pachystilicus species tend to be more robust with shorter elytra relative to body length. Accurate identification to subtribe level generally requires examination of microscopic characters and reference to specialized taxonomic keys.

Members of Stilicina occupy diverse terrestrial habitats including leaf litter, soil, decaying wood, and moss. Many species are found in moist, shaded microhabitats. Some genera such as Rugilus are frequently collected in riparian zones and wetland margins. The subtribe shows broad ecological tolerance across its geographic range.

The subtribe has a wide distribution including North America, Europe, Asia, and parts of Africa and South America. Individual genera show varying ranges: Rugilus is primarily Palearctic with some Nearctic representation, while Acrostilicus and Megastilicus are restricted to the Nearctic region. Panscopaeus and Stilicoderus have broader tropical distributions.

Adult activity patterns vary by species and latitude. In temperate regions, most species are active from spring through autumn, with peak abundance during summer months. Tropical species may show year-round activity with peaks during rainy seasons. Specific phenological data are limited for many genera.

Stilicina species function as generalist predators and scavengers in soil and litter communities. They contribute to nutrient cycling through consumption of small invertebrates and organic detritus. Their role in food webs as prey for larger arthropods and small vertebrates has been documented in some ecosystems but remains understudied across the subtribe.

No direct economic importance is documented. Some species occasionally occur in synanthropic habitats such as compost heaps and garden mulch. They are not known to be pests or beneficial organisms in agricultural or medical contexts.

• MedoninaAnother subtribe within Lathrobiini; distinguished by differences in antennal insertion, mesocoxal structure, and aedeagus morphology. Medonina species often show more uniform body sculpturing compared to the variable patterns seen in Stilicina.
• Lathrobiini (remaining subtribes)Stilicina differs from other Lathrobiini subtribes (such as Lathrobiina) in details of the mouthpart structure, tarsal formula, and male genitalia configuration, though these characters require microscopic examination for reliable separation.

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