Spermatogenesis, spermiogenesis and sperm structure in Crenobia (Planaria) alpina (Dana)

Linden, A.G.J.M. van der

doi:10.1007/bf00332803

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1970

1975

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“…The mature sperm nucleus is more than twice as long as a spermatid nucleus from the stage of Fig . 2 Exactly the same observations were reported for spermiogenesis in another flatworm species, Crenobia alpina (Linden 1969a) , where also a discussion of the implications of this unusual course of events has been given .…”

supporting

confidence: 52%

“…The particular population mentioned above, should be called a hexaploid when compared with other Crenobia populations. However it was found to be functionally diploid (2n=42), which means that the chromosomes could not be divided into six groups of 7 homologues but only into two groups of 21 homologous chromosomes (Linden 1969b). Furthermore it was thought that all flatworms uniformly possessed a 9+1 pattern of microtubules in their flagellae.…”

mentioning

confidence: 99%

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