Pill millipede

Superorder of millipedes

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); rather, this is a case of convergent evolution.

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