Abstract
Meiosis occurs in the resistant sporangium ofCoelomomyces psorophorae, confirming the hypothesis that the diplophase of this obligate parasite is restricted to the mosquito and the haplophase to the copepod host. Preparations for light microscopy indicate that two nuclear divisions occur during germination of the resistant sporangia (RS), and this is accompanied by an appropriate reduction in nuclear volume. Reconstructions of serially sectioned pachytene nuclei reveal 10 synaptonemal complexes that extend in a linear fashion through the nucleus, with their telomeres associated with the nuclear envelope. Microspectrophotometric analysis indicates that the zygote contains twice the amount of DNA found in either gametes or RS zoospores (meiospores). The latter spore contains 5.63 ± 0.64 × 10ȡ14 g DNA/cell as determined by microfluorimetry.
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