"Until the internal structure of these brachiopods has been studied no reliance can be placed on generic identifications, and even members of different families may be confused when owing to poor preservation the exact nature of the peduncle opening is not clearly decipherable." Serial sections, therefore, are necessary for the determination of species. Mentzelia persica n. sp. is described, from the Permian of Qashgai Sarhad, Iran.

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