Dear MARMAM Community, On behalf of my coauthors, I am pleased to share our recent publication in Brain, Structure and Function, as part of the Special Issue: "Towards multi-modal, multi-species brain atlases". Avelino-de-Souza, K., Mynssen, H., Chaim, K. *et al.* Anatomical and volumetric description of the guiana dolphin (*Sotalia guianensis*) brain from an ultra-high-field magnetic resonance imaging. *Brain Struct Funct* (2024). https://doi.org/10.1007/s00429-024-02789-1 *Abstract* The Guiana dolphin (*Sotalia guianensis*) is a common species along Central and South American coastal waters. Although much effort has been made to understand its behavioral ecology and evolution, very little is known about its brain. The use of ultra-high field MRI in anatomical descriptions of cetacean brains is a very promising approach that is still uncommon. In this study, we present for the first time a full anatomical description of the Guiana dolphin’s brain based on high-resolution ultra-high-field magnetic resonance imaging, providing an exceptional level of brain anatomical details, and enriching our understanding of the species. Brain structures were labeled and volumetric measurements were delineated for many distinguishable structures, including the gray matter and white matter of the cerebral cortex, amygdala, hippocampus, superior and inferior colliculi, thalamus, corpus callosum, ventricles, brainstem and cerebellum. Additionally, we provide the surface anatomy of the Guiana dolphin brain, including the labeling of main sulci and gyri as well as the calculation of its gyrification index. These neuroanatomical data, absent from the literature to date, will help disentangle the history behind cetacean brain evolution and consequently, mammalian evolution, representing a significant new source for future comparative studies. The full article is open access and available at: https://link.springer.com/article/10.1007/s00429-024-02789-1 Please do not hesitate to reach out with any questions you may have at kamilla_bio@ufrj.br Kind regards, -- *| Kamilla A. de Souza* Director of the Brazilian Neurobiodiversity Network Ph.D. in Morphological Sciences Federal University of Rio de Janeiro, Brazil. *https://lattes.cnpq.br/0983547349106771* <https://wwws.cnpq.br/cvlattesweb/PKG_MENU.menu?f_cod=EBC24F10BBACA52C80481320E9E56792#>