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†Ptygmactrum Cooper & Grant 1976
urn:lsid:organismnames.com:name:2090369
Microreference
1939
...
†Ptygmactrum Cooper & Grant 1976
Cooper & Grant 1976. Permian brachiopods of west Texas, 4. (Part 1: text, Part 2: plates). Smithsonian Contributions to Paleobiology, No. 21 1976: 1923-2607