Porcellio dilatatus (Commonly known as the Giant canyon isopod) is a species of woodlouse in the genus Porcellio belonging to the family Porcellionidae.

[2] They are 15 millimetres (0.59 in) long, are brown coloured and striped.

[3] They can be found feeding on alder leaves,[4] but mostly feeds on organic food substrates, such as lettuce (Lactuca sativa) in the wild.

It also feeds on inorganic metal salts.

[5] The species are considered to be house pests, that can be found in greenhouses, seed boxes, and flower pots.