Summary
Spermatogenesis of H. nodulosa from Catostomus commersoni (Catostomidae) from New York (USA) was studied by means of sections and squashes and found to consist of the following stages. Primary spermatogonia undergo a series of mitotic divisions resulting in successive linked clusters of two secondary, four tertiary, and eight quaternary spermatogonia. With succeeding divisions, sixteen primary spermatocytes are formed that have their nuclei arranged toward the periphery of a central syncytial mass. Thirty-two secondary spermatocytes arise from the first maturation division. A second maturation division yields sixty-four spherical spermatids that, still connected to the central cytoplasmic mass, subsequently mature to form spermatozoa. Thus this sequence is essentially similar to that reported for Cyclophyllidea and Pseudophyllidea. Drawings and photographs of many of the above mentioned stages supplement the description.
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Kazacos, K., Mackiewicz, J.S. Spermatogenesis in Hunterella nodulosa Mackiewicz and McCrae, 1962 (Cestoidea: Caryophyllidea). Z. F. Parasitenkunde 38, 21–31 (1971). https://doi.org/10.1007/BF00259481
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DOI: https://doi.org/10.1007/BF00259481