Pleopodal lungs

Pleopodal lungs are an anatomical feature of terrestrial isopods and a component of their respiratory system. They are ancestrally derived from pleopodal gills, and they facilitate gas exchange on land. They perform a similar function as spiracles do in insects.[1][2]

The white patches on the first two pairs of pleopods on this specimen of Porcellio laevis identify them as pleopodal lungs.

Armadillidium vulgare, male pleon, ventral view.
en endopodite
ep epimeron
ex exopodite
lg pleopodal lung
pp pleopod
pr protopodite
pt pleotelson
ur uropod

Pleopodal lungs of Porcellio scaber

Pleopodal lungs are identifiable on woodlice as white patches on the lower 5 segments (the pleon) on the ventral side (underside). The number of pleopodal lungs vary by species – they may have up to five pairs, or only two pairs as in Porcellio laevis; a minority of species lack pleopodal lungs entirely.[1]

References

"Woodlice: 'pleopodal lungs'". British Myriapod and Isopod Group. Retrieved 2020-04-24.
Unwin, Earnest Ewart (1931). "On the structure of the respiratory organs of the terrestrial Isopoda". Papers and Proceedings of the Royal Society of Tasmania: 37–104. ISSN 0080-4703.

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[:0-1] "Woodlice: 'pleopodal lungs'". British Myriapod and Isopod Group. Retrieved 2020-04-24.

[2] Unwin, Earnest Ewart (1931). "On the structure of the respiratory organs of the terrestrial Isopoda". Papers and Proceedings of the Royal Society of Tasmania: 37–104. ISSN 0080-4703.