Spermatogenesis in several intra- and interspecific hybrids of the lemur (Lemur)

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Abstract
Spermatogenesis of various hybrids of the genus Lemur was studied by testicular biopsy. In hybrids between species whose classification is still much debated, the germinal cells had degenerated after the pachytene stage. This abnormality was variable in intensity depending on the parents'' mating: L. fulvus (2n = 60) subspecies .times. L. macaco sometimes resulted in fertile offspring; L. fulvus collaris .times. L. macaco never did. The defect in spermatogenesis probably is mostly caused by differences in meiotic behavior in the germinal cells. In hybrids between 2 spp., for which there is no taxonomic doubt (L. fulvus .times. L. rubriventer), the gonads were completely devoid of germ cells.

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