Mosineia is a genus of euthycarcinoid arthropods that lived on tidal flats of Laurentia at what is now central Wisconsin from the Middle Cambrian to the Late Cambrian.

Associated trace fossil evidence suggests that this genus spent some of its time subaerially, possibly to mate and to feed on the microbial mats that blanketed the beaches.

[2] The genus is named after Mosinee---the city in Marathon County, Wisconsin, near which the fossils were found.

The collecting site is known as Blackberry Hill, which is a well known Konservat-Lagerstätte that produces abundant exceptionally preserved fossils.

Since the mid-1800s, trackways named Protichnites (Greek for "first footprints") had been found on Cambrian tidal flat strata in North America.