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Circothecidae
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Brachiopoda
Class:	†Hyolitha
Order:	†Orthothecida (?)
Family:	†Circothecidae

Circothecidae are a family of Cambrian problematica, sometimes attributed to the Hyolitha, though some authors suggest (on the basis of no specified evidence) that they are definitely not.

References

1. Brasier, M. D. (1986). The succession of small shelly fossils (especially conoidal microfossils) from English Precambrian–Cambrian boundary beds. Geological Magazine, 123(3), 237–256. doi:10.1017/S0016756800034737
2. Webers, G. F., & Yochelson, E. L. (1989). Late Cambrian molluscan faunas and the origin of the Cephalopoda. Geological Society, London, Special Publications, 47(1), 29–42. doi:10.1144/gsl.sp.1989.047.01.04

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