| Summary: | The present dataset is a compilation of georeferenced occurrences of the littorinid genus Laevilacunaria Powell, 1951 (Mollusca, Gastropoda) in the Southern Ocean. Occurrence data were obtained from field expeditions (Antarctic and sub-Antarctic sampling) between 2015 and 2022, together with a review of published literature including records from 1887 to 2022. Three Laevilacunaria species have been recorded from the Southern Ocean: Laevilacunaria bennetti, L. antarctica and L. pumilio. Si The research was supported by projects FONDECYT Regular 1210787, FONDECYT Initiation 11140087, Institutos Milenio BASE ICN2021_002, PIA CONICYT ACT172065, Fondap-IDEAL 15150003, ANID/BASAL FB210018, INACH RG_18-17 to CGW and INACH DG_10-22 to SR. Postdoc FONDECYT 3210063 for CSM. The authors are thankful to Karin Gérard for helping in collecting individuals of littorinids for the study (SCUBA diving and intertidal work). A great thank you to the project PROTEKER for the sampling on Crozet and Kerguelen Islands. In addition, many thanks to Valentina Aliaga Vargas for the map designs and Dr. Lafayette Eaton for the English revision. Thanks to the Instituto Antártico Chileno (INACH) and the Universidad Austral de Chile for providing technical support to this project.
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