Braquiópodos chonetoideos del Carbonífero de México

Four species of chonetids from the Carboniferous of Mexico are described. The anopliid Yagonia collinsoni Carter comes from the Vicente Guerrero Formation (Osagean, Lower Mississippian), Tamaulipas, in northeastern Mexico. The anopliid Tornquistia sp., and the rugosochonetids Neochonetes (N.) granulifer (Owen) and Neochonetes (N.) mixteco n. sp. have been found in the Ixtaltepec Formation (Lower-Middle Pennsylvanian), Oaxaca, southeastern Mexico. The find of Yagonia in Osagean rocks of Tamaulipas State represents the oldest record of the genus and it indicates paleogeographic relations between Australia, South America and North America. The report of Tornquistia confirms the presence of the genus in North America. Pennsylvanian Neochonetes (N.) species from Oaxaca State are related to typical North American lineages, the new species is included in that of Neochonetes