Evidence for Meiosis in the Testate Amoeba Arcella |
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| Authors: | JEAN-PIERRE MIGNOT IGOR B. RAIKOV |
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| Affiliation: | Groupe de Zoologie et Protistologie, U.R.A. CNRS 138, UniversitéB. pascal de Clermont-Ferrand, 63177 Aubiére Cedex, France;Institute of Cytology. Academy of Sciences, 4 Tikhoretsky Avenue, 194064 Leningrad, USSR |
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| Abstract: | ABSTRACT. Electron microscopic studies of Arcella vulgaris have revealed a sexual process occurring in cysts. The evidence includes: I) synaplonemal complexes in prophasic nuclei. 2) two consecutive divisions different from vegetative mitosis, 3) degeneration of certain products of these nuclear divisions, and 4) fusion of nuclei indicating karyogamy. The process is apparently autogamy preceded by a two-division meiosis. The testate amoebae can no longer be considered asexual. |
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| Keywords: | Autogamy cysts Rhizopoda synaptoncmal complex ultrastructure |
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