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摘要
an investigation of genera euastrum ehrenberg ex ralfs and micrasterias c.agardh from an amazon floodplain lake of the negro river basin was undertaken. the samples were collected using a plankton net in four stations on the tupe lake and one station near a lake on the negro river. the species were identified and described on the basis of morphological and morphometrical characteristics. a total of 12 species were identified, five species of euastrum genus (e. evolutum var. perornatum; e. gemmatum var. monocyclum; e. ornans; e. sinuosum; e. spinulosum), and seven of micrasterias genus (m. borgei; m. radiata var. brasiliensis; m. torreyi; m. laticeps var. acuminata; m. mahabuleshwarensis var. amazonensis; m. rotata var. rotata; m. siolii). all species, except m. radiata hassal var. brasiliensis grˋnblad, were found in the negro river; on the other hand, only seven species were found in the tup谷 lake, three of euastrum and four of micrasterias.
