What specialized external respiratory organs do terrestrial isopods (Oniscidea) use for breathing?
Answer
pseudotracheae (pleopods)
The woodlouse, a member of the Suborder Oniscidea, has adapted to terrestrial life while still being constrained by the need for moisture because its respiratory system is derived from its aquatic ancestry. These specialized structures are known as pseudotracheae, which are modifications of the ancestral gill structures called pleopods. These organs function by absorbing oxygen from the environment, but critically, they must remain moist to facilitate efficient gas exchange. This physiological requirement explains why woodlice are rarely found in dry environments and must seek out humid refuges to maintain respiratory function.
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