The genus Oniscus properly contains some of Europe's most recognisable woodlice — including the Common Shiny Woodlouse (Oniscus asellus) that most UK keepers will already know from their gardens. Distinguished from the rough-textured Porcellio by their smooth, glossy exoskeletons with characteristic yellow patches along the sides, Oniscus species reach up to 16mm and properly serve as one of the most familiar terrestrial isopods across the British Isles, Western Europe, and Northern Europe.

What makes Oniscus interesting for hobby keepers isn't usually the standard wild type (you can find those in any UK garden), but rather the captive-bred colour morphs and lesser-known subspecies and species. Our collection includes Oniscus asellus 'Orange' (a properly striking selectively-bred colour morph), Oniscus asellus occidentalis (a recognised subspecies often described as occurring in western coastal regions), and Oniscus lusitanus (a species native to the Iberian Peninsula). Each offers something different from the standard Oniscus asellus you might collect locally.

Husbandry is properly straightforward — these are species adapted to UK and European temperate climates, so they don't need tropical setups. Cool to moderate temperatures (15-25°C), moderate humidity, leaf litter, decaying wood, and standard isopod substrate work well. They're properly excellent options for keepers wanting native European species without the demanding requirements of tropical Cubaris or specialist Troglodillo. Browse our Porcellio isopods collection for the other common UK native genus, or read our common woodlouse article for more on identifying and understanding these familiar UK natives.