Sphaeroma oregonensis Dana, 1853 Gnorimosphaeroma oregonensis (Dana, 1853) Gnorimosphaeroma oregonense, the Oregon pill bug, is a small intertidal isopod crustacean.

It is an oval-shaped organism roughly 6 mm in length,[2] and about twice as long as it is wide.

The primary habitat of G. oregonense is the mid-Californian to Alaskan coast, where it inhabits tidal pools and the intertidal region up to depths of 24 metres (79 ft).

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