Summary
A cytological study has been made, at the light- and electron-microscope levels, of gonadal development in Arion circumscriptus. The gonad appears to be ectodermal in origin and is composed of two cell lines—germinal and non-germinal. These two lineages are established in the embryo. The germinal line is first represented by primordial germ cells while the non-germinal line is first represented by auxiliary cells. The primordial germ cells differentiate into spermatogonia and oogonia, the auxiliary cells into Sertoli cells and follicular cells. Spermatogonia and oogonia differentiate about the time of hatching. All subsequent germ cells appear to differentiate from these initial populations of spermatogonia and oogonia. The concept of a germinal epithelium, as a cell layer in which germ cells differentiate from indeterminate germ cells throughout the life cycle, is not supported by this study.
A model for sex determination of the germ cells is proposed based on the hypothesis that sexually non-determined primordial germ cells are distributed into two physiologically isolated compartments (a male medullar compartment and a female cortical compartment). The spermatogonia and oogonia then differentiate in two different microenvironments.
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Supported in part by NSF Traineeship Grant GZ-198.1 and NIH Developmental Biology Training Grant, No. 5-T01-HD00266-01.
The author extends his thanks to Professors Alan J. Kohn, Edward C. Roosen-Runge, and W. Siang Hsu for their advice, suggestions, and encouragement.
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Luchtel, D. Gonadal development and sex determination in pulmonate molluscs. Z.Zellforsch 130, 279–301 (1972). https://doi.org/10.1007/BF00306943
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DOI: https://doi.org/10.1007/BF00306943