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Buitrón-Sánchez, B.-E.;  Cuen-Romero, F.-J.; Beresi, M.-S.; Monreal, R. First Record of Ubaghsicystis (Eocrinoidea - Echinodermata) from the Cambrian (Miaolingian, Wuliuan) of Sonora, Mexico: Biostratigraphical and Paleoecological Considerations. Rev. Biol. Trop. 2021, 69, S51–S65.