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†Ptychagnostus (Acidusus) Opik 1979
urn:lsid:organismnames.com:name:137807
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†Ptychagnostus (Acidusus) Opik 1979
Opik 1979. Middle Cambrian agnostids: systematics and biostratigraphy. Bureau of Mineral Resources Geology and Geophysics Bulletin (Canberra), No. 172 1979: i-xi,1-888;138p