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<abstract language="eng">In the present paper five paratype specimens of the Metcalf Collection of Opalinids at the Smithsonian Institution, U. S. National Museum. U.S.A, are studied and figured in detail: Zelleriella uruguayensis quadrata Metcalf, 1940, Z. dubia Metcalf, 1940. Z. ovonucleata Metcalf, 1940, Cepedea ciliata Metcalf, 1940, and, C. plata Metcalf, 1940. Some specimens are not well enough preserved and the restudy of fresh material would probably be worth while

memórias do instituto oswaldo cruz

Revisão dos Parátipos de cinco espécies de opalinídeos do Brasil, depositados na "Smithsonian institution ", nos Estados Unidos (Sarcomastigophora, Opalinata)