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Diagnosis: Spheroidal to pear-shaped lattice shell. Pyramids usually with 5-6 sides and stout axial rod, with one or a few (2-5, Reshetnjak, 1966) radial spines at apex, with crown of 10-20 slightly curved terminal branches, sometimes slightly fused at bases. Axial rods sometimes with short lateral branches at apex of pyramids, sometimes forming secondary spherical lattice, rarely with poorly developed crowns of few short terminal branches.

Length: to 3.5 or 4.5 mm.

Sagenoscena irmingeriana