New occurrences of Chonetoidea (Brachiopoda) in the Devonian of Bolivia, Peru and Antarctica

• Published in: Brazilian Journal of Geology
• Main Authors: Roberto Videira-Santos, Sandro Marcelo Scheffler, Antonio Carlos Sequeira Fernandes
• Format: Article in Journal/Newspaper
• Language: English; Spanish; French; Portuguese
• Published: Sociedade Brasileira de Geologia 2022
• Subjects: chonetoids; Malvinokaffric realm; Gondwana; systematic paleontology; Geology; QE1-996.5; Argentina; Uruguay; Antarc*; Antarctica
• Online Access: https://doi.org/10.1590/2317-4889202120210080; https://doaj.org/article/ce0a0f8ef9d74d5396d7c185f819886a

Abstract Chonetoidea corresponds to one of the most abundant superfamilies throughout the Malvinokaffric Realm (Argentina, Uruguay, Bolivia, Paraguay, Antarctica, Peru and South-Central Brazil). In this paper we provided a better understanding of the diversity of this superfamily during the Devonian in southern Gondwana. For Bolivian specimens, we corroborate both the occurrence of Pleurochonetes anteloi in the Huamampampa Formation, that is, this species may have occurred at least in the Givetian, and the occurrence of Australostrophia mesembria in the Pragian-Emsian of Bolivia. We further identify both Aseptonetes isaacsoni in the Icla/Gamoneda Formation, which represents the oldest occurrence of this species, and Chonostrophia truyolsae in the Belén Formation/Bolivian Altiplano, thereby expanding its geographical distribution. We also provide the first description and illustration of a specimen of Chonetoidea from Antarctica and record the first occurrence of Australostrophia mesembria, Devonochonetinae indet. and Eodevonaria sp. in the Cabanillas Formation of Peru. Because A. mesembria is a typical Malvinokaffric species, this corroborates the extension of this realm into southern Peru.