Bacillariophyceae de los canales de drenaje de Corfo (Río Colorado, Buenos Aires, Argentina)

Abstract

Bacillariophyceae from the channels of CORFO (Colorado River, Buenos Aires. Argentina). This work is a contribution to the knowledge of the diatomaceous flora from the drainage channels of brackish water of CORFO (Colorado River), located in the southern area of the province of Buenos Aires, Argentina. Ninety species were identified; seven of them belong to the order Centrales and the remaining eighty-three to the order Pennales. Cylindrotheca gracilis (Brébisson) Grunow and Nitzschia agnita Hustedt are new records for Argentina, while Hyalodiscus Ientiginosus John, Navicula circumtexta Meister, Plagiotropis lepidoptera (Pfitzer) Cleve, Nitzschia desertorum Hustedt, N. heuflen'ana Grunow, N. rautenbachiae Cholnoky, and N. reverse W. Smith are new records for Buenos Aires. This study includes a table showing the presence/absence of the identified taxa, as well as a description of the species which are either new or rare for Argentina and the province of Buenos Aires, or interesting because of their morphology and/or taxonomy.

Esta es una contribucién al conocimiento de la flora diatomolégica de Ios canales de drenaje de agua salobre de CORFO (Rio Colorado), al sur de la provincia de Buenos Aires, Argentina. Se iden- tificaron noventa especies, siete pertenecientes al orden Centrales y ochenta y tres al orden Pennales. Se cita Cylindrotheca gracilis (Brébisson) Grunow por primera vez para la Argentina, mientras que Hyalodiscus lentiginosus John, Navicula circumtexta Meister, Plagiotropis Iepidoptera (Pfitzer) Cleve, Nitzschia desertorum Hustedt, N. intermedia Hantzsch, N. rautenbachiae Cholnoky y N. reverse W. Smith son nuevas citas para la provincia de Buenos Aires. Se describen especies nuevas o raras para Argentina y la provincia de Buenos Aires y [es que por su morfologia y/o taxonomia resuitan de interés.