See text Mucrospirifer is a genus of extinct brachiopods in the class Rhynchonellata (Articulata) and the order Spiriferida.

These fossils occur mainly in Middle Devonian strata[2] and appear to occur around the world, except in Australia and Antarctica.

The shell of Mucrospirifer has a fold, sulcus and costae.

It is greatly elongated along the hinge line, which extends outward to form sharp points.

[2] Mucrospirifer lived in muddy marine sediments, and were attached to the sea floor via the pedicle.