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Abstract
The morphology and taxonomy of species of the genera Cocconeis Ehrenberg and Psammococconeis Garcia from the Gulf of San Matías (Patagonia, Argentina) is documented in the present study. A total of 16 taxa of Cocconeis and one species of Psammococconeis were found in surface net hauls taken in shallow coastal waters of the Gulf. Cocconeis fluminensis var. fluminensis, C. fluminensis var. subimpleta, C. guttata, C. peltoides and C. neothumensis var. marina are new records for the southwestern Atlantic Ocean.