Two xanthoid crabs, Panopeus meridionalis Williams, 1984 and Eurypanopeus depressus Smith, 1869 are reported from Mar Chiquita, a coastal lagoon in the warm-temperate region of the southwestern Atlantic. This study documents the presence of a stable population of P. meridionalis in the lagoon, although there have been some sporadic reports of this species in the region before 2000. It reports the first finding of E. depressus in waters south of the Rio de la Plata estuary. The role of Rio de la Plata as a biogeographical barrier is briefly discussed.
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Vol. 118 • No. 3