What distinction separates Pill Bugs from Sow Bugs regarding their morphology?
Answer
Pill bugs have evolved the ability to roll into a protective sphere
The most recognizable morphological difference between the two main groups is the defensive strategy employed by Pill Bugs (family Armadillidiidae). Pill bugs have evolved the specialized ability to roll into a perfect sphere, shielding their vulnerable ventral side and respiratory structures from predators and acute dehydration events. Sow bugs, being flatter and possessing well-developed uropods, rely instead on hiding in damp environments and rapid movement for defense. This rolling behavior in pill bugs represents a more recent evolutionary novelty focusing on structural defense.
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