Woodlouse

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Woodlouse collage x4
Oniscidea all
Oniscidea woodlouse morphology
Gråsuggor (Isopoda) - Ystad-2020
Dysdera crocata

Woodlouse (Oniscidea) is a crustacean belonging to the order Isopoda, with over 5,000 species identified across various habitats worldwide. Woodlice are characterized by their segmented, oval bodies, which can range in color from grey to brown, and their ability to roll into a ball as a defensive mechanism, a trait specific to the family Armadillidiidae, commonly known as pill bugs or roly-polies. Despite their common name, woodlice are not actually lice and do not parasitize humans or animals.

Description[edit | edit source]

Woodlice have a rigid, segmented exoskeleton, which they must periodically shed in a process called molting in order to grow. They possess seven pairs of legs and two pairs of antennae, though one pair is often much smaller and less visible. Their size can vary significantly, from a few millimeters to up to 16 millimeters in length, depending on the species.

Habitat and Distribution[edit | edit source]

Woodlice are found in a wide range of environments, from forests and gardens to caves and deserts, demonstrating their adaptability. They prefer moist environments and are often found under rocks, logs, and leaf litter, where humidity is higher. Woodlice play a crucial role in their ecosystems by breaking down dead plant material, thus contributing to nutrient cycling and soil health.

Behavior and Ecology[edit | edit source]

Woodlice are primarily nocturnal and are known for their detritivorous diet, feeding on decaying leaf litter and other plant matter. Some species are more selective feeders, consuming fungi or algae. Their behavior of rolling into a ball, exhibited by species in the family Armadillidiidae, serves as a defense mechanism against predators by protecting their softer underparts.

Reproduction[edit | edit source]

Woodlice reproduce sexually, with some species capable of parthenogenesis, a form of asexual reproduction. Females carry their fertilized eggs in a pouch called a marsupium until they hatch. The young, which resemble miniature adults, remain in the pouch for several days before emerging to fend for themselves.

Conservation[edit | edit source]

Most woodlice species are not considered threatened and have a wide distribution. However, habitat destruction and pollution can impact local populations. Some species are used as bioindicators to assess the health of their environments.

In Culture[edit | edit source]

Woodlice have been subjects of curiosity and affection, particularly among children, in various cultures. They are often considered beneficial in gardens for their role in decomposing organic matter.


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