RESUMENSe hace un estudio taxonómico detallado de P. rioi (Nyst y Galeotti, 1840) basado sobre el material proveniente de la región fosilífera del Aptiano de San Juan Raya y Zapotitlán, en el Estado de Puebla. En el presente trabajo se aclara el status taxonómico de P. rioi, la cual había permanecido fuera de la nomenclatura, debido a la carencia de una revisión taxonómica detallada. Se demuestra que P. onoense (Stanton) 1895 es un sinónimo secundario.
ABSTRACTA detailed toxonomic study of P. rioi (Nyst y Galeotti, 1840), is given based on the material from the Aptian fossiliferous localities near San Juan Raya and Zapotitlán, Puebla.1t is suggested that P. onoense (Stanton) 1895, is a junior synonym of P. rioi. However P. rioi has been left out of the nomenclature because the lack of detailed taxonomic studies.
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