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Abstract
Amphora coffeaeformis (Agardh) Kützing has been reported in Argentina from marine and inland environments. Since this species has frequently been misidentified, we carried out a review of materials corresponding to the records of A. coffeaeformis and compared them with photographs of the type material. All analyzed materials are similar as regards valve outline and dimensions; however, they differ in valve morphology, mainly in the type of striae and areolae. The presence of A. coffeaeformis was corroborated in materials from Buenos Aires (Arroyo Tapalqué), Jujuy, San Luis and La Pampa. The materials from Mar del Plata correspond to Amphora hybrida Grunow, a new record for South America, and those found in samples from Lago Nahuel Huapi correspond to A. veneta var. capitata Haworth. Six other taxa purported to be A. coffeaeformis could not be determined and will be the subject of further research. Considering that A. coffeaeformis has been reported as a potential domoic acid producer, we compared our materials with those in which the toxin was detected. Our results show that the identity of the toxigenic species is uncertain.
