Abstract
During the meiotic prophase the nuclei of the spermatocytes and oocytes of Panorpa communis contain a paracrystalloid body (PB). This is built up of about 100 filaments of 80 A thickness all running parallel to one another. The filaments are connected by a network of many thin fibers. At pachytene and diplotene the PB is connected with the nucleolus. In spermatocytes at late diplotene the PB is enveloped by RNP-material, which is produced by certain chromosomes at the “diffuse diplotene” stage. Thereafter the PB is gradually removed. During this process the RNP-material coils up to form three or four spherical RNP-bodies. It is suggested that the PB has a function in assembling and connecting the RNP-material to form long ribbons which build up the RNP-bodies.
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