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Diagnosis: Lattice shell ovoidal, pear-, heart-, or spindle-shaped. Pyramids with 2-5 (usually 3) apical spines, with 2-3 distal whorls of 3-4 lateral branches. Branches of terminal whorl with forked or tripartite spathillae; branches of inner whorl with simple spathillae.

Length: 3.0-6.8 mm.

Sagenoarium chuni