The purpose of the scientific cruise CEAMARC was to explore the East-Antarctic sector, off Georges V and Terre Adélie, to study the biodiversity of plankton, fishes and benthic fauna. The aim of the current study is to focus on a major part of this benthic fauna, highlighting the representatives of the phylum Brachiopoda. Still present in all oceans, brachiopods, suspension feeders, are not often studied. They are marine invertebrates with a calcite bivalved shell, living attached to various substrates by means of their pedicle or by cementation. The purpose of this study was to review their diversity compared to the equivalent representatives, when available, in circumpolar and/or subantarctic waters, the characteristics of the species and the micro and nanostructure of their shells (biomaterial). The ecology and depth ranges are reported. As well, the results of multiproxy assessment of the brachiopod calcite shell highlight the role these organisms play in reflecting the environmental conditions of the surrounding seawater. As highlighted in a recent study on modern shells, including some subaustral and Austral species, geochemical thermometers like carbonate clumped isotopes (Δ47), independent from δ18Osw values, were used.