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†Protoryctocephalus Chow[sic]
urn:lsid:organismnames.com:name:2172028
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xiCicL
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†Protoryctocephalus Chow[sic]
Chow[sic]. [Bio-environmental control hypothesis and its application to the Cambrian biostratigraphy and palaeozoogeography.]. Memoirs Nanking Inst. Geol Paleont, No. 5 1974: 27-110