Traits taxon details
original description
Rowell, A. J. (1966). Revision of some Cambrian and Ordovician inarticulate brachiopods. <em>University of Kansas Paleontological Contributions.</em> 7: 1-36. [details]
basis of record
Nazarov, B. B.; Popov, L. E. (1980). Stratigrafiya i fauna kremnisto-karbonatnykh otlozhenij Kazakhstana (Stratigraphy and fauna of Ordovician siliceous-carbonate deposits of Kazakhstan). <em>Geologicheskiy Instituta Akademii Nauk SSSR, Trudy.</em> 331: 1-190, 32 pls. note: Uses the generally unaccepted spelling "Phyzotreta" rather than "Physotreta" for this genus. [details] Available for editors 
additional source
Treatise on Invertebrate Paleontology. (1997-2007). Part H revised, Brachiopoda. <em>Geological Society of America, Boulder; and University of Kansas Press, Lawrence,.</em> vol. 1-6. note: Williams et al. (2000) Part H Brachiopoda (revised): Volumes 2 & 3, Linguliformea, Craniiformea, Rhynchonelliformea (part). [details]
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