ISSN:
1573-5192
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary The features by which the body-form of a species of Zelleriella may be described are defined and compared with those of Opalina and Protoopalina. Z. africana Sandon: The two forms previously included under this name are re-examined, some developmental stages are described and the relationships between the two forms discussed. The following new species are described: Z. angusticeps from Bufo angusticeps Smith from Cape Town; two species from Nile fish, namely, Z. distichodi from Distichodus rostratus Gunther (Citharinidae) and Z. synodontis from Synodontis clarias (Linnaeus) (Siluridae). Two types of cyst are described, one small, usually mononucleate, and relatively thick-walled, the other much bigger, binucleate, thin-walled and ciliated. In Z. angusticeps separation of the two halves in cytokinesis begins at the posterior end of the body, the falx being the last part to divide. Such division is contrasted with the kind of interkinetal fission found in other opalinids and with the longitudinal fission of flagellates. The evidence that there are two types of longitudinal fission among the Zelleriellas is discussed. Life-cycles, geographical distribution and host relationships are also discussed. ac]19790807
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00009844
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