Protozoa, protists and protoctists in the system of Eucaryota

A.O. Frolov and A. Yu Kostygov

Proceedings of the Zoological Institute RAS, 2013, 317(Supplement 2):

Abstract

History of emergence and usage of kingdom names Protozoa, Protoctista and Protista have been analyzed. It have been demonstrated that despite popular belief they are initially synonyms. At present the results of comparative morphological and molecular phylogenetic studies prove convincingly that microorganisms formerly united according to one or another taxonomic concept (Protozoa, Protoctista или Protista) do not represent a monophyletic group. Therefore taxa with such names are absent in the contemporary system of eukaryotes. Nevertheless there is no need to abolish terms “protozoa”, “protists” and “protoctists”. It is just to be borne in mind that like a widely used term “invertebrates” they denote a non-taxonomic group of organisms.

Key words

protozoa, protists, protoctists, lower eukaryotes, non-taxonomic group

Published September 16, 2013

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