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In diatoms the use of molecular tools to corroborate traditional (morphological) identification offers a new perspective in the field of biogeography. This manuscript reports the first record of the raphid pennate diatom  Nitzschia volvendirostrata  along the coast of Mexico, which in turn represents an expansion of the geographic range along the American continent. The cells were isolated from benthic samples taken from Balandra lagoon, La Paz, Baja California Sur, Mexico and cultured as a monoclonal culture. Morphology and morphometry of the diatom obtained from light and electron microscopy reveal that they correspond to the original description of  N. volvendirostrata  and also its chloroplast sequences,  rbcL  and  psbC , showed 98.7 to 100 % similarity and a close phylogenetic relationship with  N. volvendirostrata . The reported places for this taxon show that it has a tropical-temperate biogeographical affinity.

marine biodiversity records

Geographical range expansion of Nitzschia volvendirostrata Ashworth, Dąbek &amp; Witkowski, 2016 (Bacillariophyta: Bacillariaceae) based on morphological and molecular analysis