Nosy Pill Woodlouse

Fascinating facts about the Nosy Pill Woodlouse

• When disturbed the nosy pill woodlouse curls up but never closes into a perfect sphere, leaving a visible gap along its sides. This incomplete enrolment is shared with Armadillidium depressum and contrasts with the tight balls formed by most pill woodlice. At up to 21 mm long, the animal can still protect its soft underside while remaining slightly exposed.
• A small rectangular protrusion sits on the apex of the head, giving the nosy pill woodlouse a distinctive "nose" that instantly separates it from similar species. Although its overall colour is a dark grey like Armadillidium vulgare, this nose is the primary visual cue used by experts for identification. Some individuals also display pale longitudinal stripes running from head to rear, but these markings vary and are not reliable for distinguishing the species.
• The telson of Armadillidium nasatum ends in a rounded tip with sides that curve inward, a shape that stands out from the flatter, smaller tails typical of most Armadillidium relatives. This rounded, incurved tail provides a clear visual cue for identification when the animal is examined from behind. While many pill woodlice have a compact, flat tail that aids in tight ball formation, the nosy pill's tail shape reflects its tendency to enrol only partially.
• The nosy pill woodlouse favours habitats that are drier than those preferred by most other woodlice, seeking out places altered by human activity. It is especially common on railway lines and on industrial waste ground, where moisture levels are lower and shelter is scarce. Despite this preference for dry, disturbed sites, the species still shelters under stones and pieces of wood when the opportunity arises, using these micro-habitats for moisture and protection.
• Originally native to Western Europe, the nosy pill woodlouse has been carried across the Atlantic and now occurs in North America. Its arrival there was alongside the closely related Armadillidium vulgare, which shares a similar European origin. Both species were introduced beyond their native range, expanding their distribution far from the patches in southern England and Ireland where they are most common.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

At a glance

About the Nosy Pill Woodlouse

In the damp, hidden recesses of the forest floor, the Nosy Pill Woodlouse navigates its miniature world with deliberate, unhurried purpose, its armored shell glistening with dew as it rolls into a perfect ball for defense. As it moves, the woodlouse leaves behind a trail of subtle, almost imperceptible disturbance, a testament to its quietly industrious nature. With its distinctive, elongated snout twitching as it senses the surroundings, this small, unassuming creature embodies a remarkable blend of resilience and adaptability.

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