Mucrospirifer mucronatus is a species of articulate brachiopod from the middle Devonian.

The cardinal extremities on the posterior are elongated in adolescent specimens to form spines.

[4] Mucrospirifer mucronatus was a filter feeder, that lived anchored to the seafloor.

The species would’ve been common to reefs in the middle Devonian, was attached to the seafloor through a pedicle.

Like modern brachiopods, Mucrospirifer mucronatus would have tolerated relatively anoxic conditions.