Abstract
Summary Taxonomic relationships were determined by comparing isozymic similarity coefficients within and between 4 genera of family Amoebidae. Of the 6 strains of Amoeba proteus , the Ca strain is elevated to the status of subspecies and called A. proteus hopkinsensis while the other 5 strains form a tight proteus cluster. From previous morphological and physiological daui and the present isozymic data, Amoeba amazonas is described as a new and distinct species within genus Amoeba . Since it is shown that the common giant amoeba is interspecifically but intragenerically related to A. proteus , A. amazonas and Amoeba borokensis , its name has been changed to that of a former synonym, Amoeba carolinensis . Finally a new genus, Metamoeba , is established of which M. leningradensis , the former Amoeba leningradensis , is the type species inasmuch as it is not intragenerically related to genus Amoeba and can not be identified with any species previously desenbed and named.
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