Agradecimentos: The authors are thankful to Thais Peixoto Macedo (Universidade Federal de Santa Catarina) for collecting the Sargassum material from the Abrolhos Bank. We are also grateful to Francisco Eriberto de Lima Nascimento (Museu de Zoologia, Universidade de São Paulo) for his assistance with the maps. The first author is extremely thankful to Maria Bernardete Barbosa (Berna) and the team from the Abrolhos National Park Ver menos

Abstract: The genus Pseudaeginella is analysed herein by cladistic methods based on a morphological data matrix of 49 characters x 18 terminal taxa. Based on the results, we comment on the phylogenetic position of Paradeutella within Pseudaeginella, and we propose Pseudaeginella multispinosa comb. nov. and Pseudaeginella tanzaniensis comb. nov. Pseudaeginella freirei sp. nov. is described from the Abrolhos Bank, north-eastern Brazil. We provide an updated key to the Pseudaeginella species Ver menos