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Silva-Morales, I. and Gómez-Vásquez, J.D. 2021. First records and two new species of sipunculans (Sipuncula) from the Southern Mexican Pacific. European Journal of Taxonomy. 740, 1 (Mar. 2021), 77-117. DOI:https://doi.org/10.5852/ejt.2021.740.1283.