|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Orthothecida - Circothecidae
It was assigned to Calyptoptomatida by Qian and Zhang (1983) and Duan (1984); to Trilobozoa by Sepkoski (2002); and to Circothecidae by Parkhaev and Demidenko (2010).
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|P. Y. Parkhaev and Y. Demidenko 2010||"Shell narrow conical and long, straight or slightly curved. Cross-section widely oval, expansion angle 6°–12°. Apical part of shell spherical. Aperture straight or almost straight. Shell ornamented by transverse ribs."|