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pill millipede
Pill millipedes are any members of two living (and one extinct) orders of millipedes, often grouped together into a single superorder, Oniscomorpha. The name Oniscomorpha refers to the millipedes' resemblance to certain woodlice (Oniscidea), also called pillbugs or "roly-polies". However, millipedes and woodlice are not closely related, belonging to the subphyla Myriapoda and Crustacea, respectively.
Pill millipedes are relatively short-bodied compared to most other millipedes, with only eleven to thirteen body segments, and are capable of rolling into a ball when disturbed. This ability evolved separately in each of the two orders, making it a case of convergent evolution, rather than homology. Pill millipedes are detritivorous, feeding on decomposing plant matter, usually in woodlands.
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==Orders==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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