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†Trifurcatoceras Obata 1940
urn:lsid:organismnames.com:name:3075242
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vLicmidvii
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†Trifurcatoceras Obata 1940
Obata 1940. Studies on the Ordovician Limestones in North China (the Fourth Report). [Japanese] Jour Shanghai Sci Inst, 9 1940: pp. 303-318