Summary
Germ cell clusters are found in the germarial region of ovarioles of Parthenothrips dracenae. Cluster mitoses are synchronized, at least initially. The intercellular bridges are filled with fusomal material, which can fuse to form polyfusomal aggregates which in turn form small rosettes. All cells develop into oocytes. Oocytes become isolated by a secondary detachment process. Intercellular bridges, together with fusomal material and cell membranes, survive for some time as isolated bodies. Phylogenetic consequences are discussed. The data provide strong evidence for a secondary panoistic ovary in thysanopterans, since cluster formation in ovaries of primary panoists has not been shown.
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Pritsch, M., Büning, J. Germ cell cluster in the panoistic ovary of Thysanoptera (Insecta). Zoomorphology 108, 309–313 (1989). https://doi.org/10.1007/BF00312163
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DOI: https://doi.org/10.1007/BF00312163