. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 76 TZE-TUAN CHEN AND ROBERT M. STABLER contain opalinids parasitized by amoeba1, whereas others are free from the parasites. There is a great range of variation in the percentage infection of opalinids among individual anuran ho^ts (Table I). The zelleriellas in some individuals of Bufo marinus from Taubate, State of Sao Paulo, Brazil, are 100 per cent infected, whereas in Rana plancyi from Peiping only a few specimens of Protoopalina quadrinn- cleata contain any amoebae. It is difficult to explain such an unusually low perc
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 76 TZE-TUAN CHEN AND ROBERT M. STABLER contain opalinids parasitized by amoeba1, whereas others are free from the parasites. There is a great range of variation in the percentage infection of opalinids among individual anuran ho^ts (Table I). The zelleriellas in some individuals of Bufo marinus from Taubate, State of Sao Paulo, Brazil, are 100 per cent infected, whereas in Rana plancyi from Peiping only a few specimens of Protoopalina quadrinn- cleata contain any amoebae. It is difficult to explain such an unusually low percentage of infection in this Protoopalina. In some anuran hosts, when their opalinids are very heavily parasitized, the small, precystic forms also contain numbers of amcebse. The encysted ciliates, when present in these anuran hosts, may also harbor the parasites. In the preparations of Protoopalina nutti in Bufo regular is regular-is from Cairo and zelleriellas in Bufo marinus from Taubate, have been observed within the opalinid cysts (Figs. 7 and 8), lying in the cytoplasm of the ciliates. In the opalinid. I O/u- 20 ju- FIGS. 7 and 8. Cysts of opalinids containing amoeba?. FIG. 7. Cyst of Zelleriella sp. from Bufo marinus containing four amoebae. FIG. 8. Cyst of Protoopalina nutti containing three amoebae. cysts only trophozoites of the amoeba have been found. Such para- sitized encysted opalinids were particularly numerous in the Bufo marinus material; in one individual host nearly 100 per cent of the cysts were infected. These cysts contain from one to seven amoebae, although tjie majority harbor only two, three, or four of them. On one slide, for example, out of 205 cysts taken at random, 67 contain 3 amoebae per cyst, 65 contain 2, 32 contain 4, 23 contain only one, 15 contain 5, 2 contain 6, and only one cyst contains none. It seems likely that the presence of amoeba- within the encysted opalinids constitutes an important method of transmission of amoeba; from ad
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
