Otariconulus

Holmer, L. E.; Popov, L. E.; Koneva, S.; Bassett, M. G. (2001). Cambrian–early Ordovician brachiopods from Malyi Karatau, the western Balkhash region, and Tien Shan, central Asia. <em>Special Papers in Palaeontology.</em> 65: 1-180.

Holmer, L. E.; Popov, L.E. (2000). Order Acrotretida. pp. 321-440. In: Kaesler, R.L. (Ed.). <em>Treatise on invertebrate paleontology. Part H. Brachiopoda (revised).</em> Vol. 2, Geological Society of America & University of Kansas, 453 pp.