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Water discolourations were observed in two localities of the NW Mediterranean (La Fosca and Palmira, Spain) during the summer of 1994 and 1995 caused by a non-toxic dinoflagellate belong- ing to the genus Alexandrium, subgenus Gessnerium. The organism was identified as Alexandrium taylori Balech, although differences were encountered compared to the original description from Arcachon (France). Detailed studies of the 1' plate were conducted on the Spanish material and com- pared with specimens from the type locality. Differences reported here between the Spanish and French populations are considered to be within the range of the morphological variability of this taxon. During the summer of 1994, a green patch was seen off the tourist beach La Fosca (Costa Brava, Spain) caused by a dinoflagellate belonging to the genus Alexan- drium. The waters were characterized by high temperatures and salinities (26°C and 38 p.s.u., respectively). Owing to the occurrence of previous toxic events of paralytic shellfish poisoning caused by Alexandrium species off the Catalan coast (Delgado et al, 1990), mussels were immediately collected from wild banks for toxicity analysis. The result of toxicity analysis by mouse bioassay (Association of Official Analytical Chemists, 1990) in two samples was negative. The dinoflagel- late was kindly identified as Alexandrium taylori by Professor E.Balech. This species is included in the subgenus Gessnerium, characterized by the V plate dis- connected from the apical pore complex.

Morphological variability in three populations of the dinoflagellate Alexandrium taylori