| Summary: | Este artículo contiene 61 páginas, 37 figuras, 2 tablas. The actual diversity of Terebellides (Annelida; Trichobranchidae) in the South East Atlantic Ocean remains largely unknown. Only two species have been reported to date, T. stroemii Sars, 1835 and T. jorgeni Hutchings, 2007. The revision of specimens collected during the Atlantide and Galathea oceanographic cruises in the Atlantic coast of Africa, along with new materials obtained during monitoring surveys off Gabon, Congo and Angola, has allowed us to describe seven new species: T. augeneri sp. nov., T. congolana sp. nov., T. fauveli sp. nov., T. kirkegaardi sp. nov., T. longiseta sp. nov., T. nkossa sp. nov. and T. ramili sp. nov. Moreover, the type material of Terebellides stroemii var. africana Augener, 1918 is redescribed and the variety raised to species. All taxa are morphologically characterised and compared with species described or reported in world seas, particularly from the Atlantic Ocean. The presence of T. stroemii in Africa and the validity of the thoracic uncini as taxonomic character is discussed and a key to all species of Terebellides described from the South Atlantic Ocean is provided. This study was partly supported by two “Fauna Ibérica” research projects (Polychaeta VI, Palpata, Canalipalpata I” (CGL2014-53332-C5-3-P) and Polychaeta VII, Palpata, Canalipalpata II” (PGC2018-095851-B-C64)) to J. Parapar and J. Moreira, funded by the Spanish “Agencia Estatal de Investigación” (AEI), and PopCOmics (CTM2017-88080) to D. Martin, funded by the AEI and the European Funds for Regional Development, and by the Consolidated Research Group on Marine Benthic Ecology of the Generalitat de Catalunya (2017SGR378). This study is a new contribution to the research contract between the CEAB (CSIC) and Créocéan, partly sponsored by TOTAL. Peer reviewed
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