Chromosome Morphology and Behavior in Macracanthorhynchus hirudinaceus

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Abstract
Gonads from Macracanthorhynchus hirudinaceus females and males were stained with aceto-orcein, then squashed and examined for morphological changes and behavior of chromosomes during mitosis and meiosis. Mitotic configurations occur in the female in the oogonia of the ovarian masses. The diploid, metaphase karyotype is composed of one homologous pair of acrocentric chromosomes and 2 metacentric pairs. In males at mitotic metaphase in spermatogonia, there is a pair of acrocentric chromosomes, a metacentric pair, and a third pair consisting of one metacentric and one subacroncentric chromosome, the latter being regarded as the Y chromosome. In the spermatocytes at late metaphase of meiosis I, the sex chromosomes separate from the autosomal mass and soon afterwards migrate to opposite poles of the spindle before terminalization of chiasmata in the 2 autosomal bivalents.

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