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†Ensigraptus Riva 1989
urn:lsid:organismnames.com:name:754073
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†Ensigraptus Riva 1989
Riva 1989. Ordovician graptolites from the northern Sierra de Cobachi, Sonora, Mexico. Transactions of the Royal Society of Edinburgh Earth Sciences, 80(2) 1989: 71-90