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122 AUDREY M. SHEPHERD'): Interpretation of sperm development in nematodes. With the increased use of the electron microscope to study nematode sper- matogenesis and the cytology and physiology of sperm, interpretation of the processes and the terms applied to various stages have not been consistent. (The basic terminology of spermatogenesis is summarised in Fig. 1). In species of Ascaris (Favard, 1961), Rhabditis (Beams & Sekhon, 1972; Shepherd & Clark, 1977), Dipetalonema (McLaren, 1973), Heterodera and Globodera (Shepherd et al., 1974), Aphelenchoides (Shepherd & Clark, 1976) and Meloidogyne (Shepherd & Clark, 1979), it was considered that the excess cytoplasm containing redundant organelles (the residual body or cytophore) is segregated within the spermatid following the reduction division until it is eventually expelled from the developing germ cell (Fig. 1). However, Gold- stein & Triantaphyllou (1980) stated that in Meloidogyne hapla: ` `The secondary spermatocytes undergo cytoplasmic rejection... similar to other nematodes", and again: "The elimination of the excess cytoplasm... mark[s] the transition of secondary spermatocytes to spermatids. " Wolf et al (1978), referring to the second meiotic division in spermatocytes of Caenorhabditis elegans, stated that: "The cytoplasm in the middle of the dividing cell... is pinched off during cytokinesis". Our
Nematologica – Brill
Published: Jan 1, 1981
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