Trichoniscus pygmaeus is a species of pygmy woodlouse native to Britain and Ireland.

[1] It has also been seen in the US in a limited distribution area.

[2] This species is about 2.5 mm (0.1 in) in length and is pinkish to yellowish.

It has a semi transparent shell and a yellow to pinkish line down the middle.

This isopod-related article is a stub.