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# w4 h' x- H% r& [5 E2 pWoodlice (known by many common names; see below) are terrestrial crustaceans with a rigid, segmented, calcareous exoskeleton and fourteen jointed limbs. They form the suborder Oniscidea within the order Isopoda, with over 3,000 known species.& P$ k4 z# F' I9 q7 {
Woodlice in the genus Armadillidium can roll up into an almost perfect sphere as a defensive mechanism, hence some of the common names such as pill bug. Most woodlice, however, are not able to do this.3 A7 E. Y4 R- t8 n$ k, O
: ~' t) B2 `6 A$ jPorcellio scaber (left) and Oniscus asellus (center) |
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