Abstract
In this paper, sixth in the series ‘Studies on Insect Spermatogenesis’ observations on the cytoplasmic inclusions in the living male germ cells of Pyrilla sp. and Dysdercus cingulatus have been presented.
The mitochondria appear as granules and delicate fibrils in the spermatogonium of Pyrilla sp. and Dysdercus cingulatus respectively. Some of the mitochondrial granules align to form filaments of low phase-change in the spermatocyte of Pyrilla sp. Some of the filamentous mitochondria bend to form ovals or rings or vesicles during meiotic stages.
The mitochondrial nebenkern, to start with, is ‘vacuolar’ in Pyrilla sp. and later reveals an ‘onion like’ pattern lacking in Dysdercus cingulatus. The ‘central substance’ is conspicuous by its absence in both the species.
‘Chondriokinesis’ without fragmentation of the individual mitochondria has been recorded in Pyrilla sp., and D. cingulatus.
During spermateleosis the fusion of the Golgi bodies result in the formation of the acroblast to which is later on associated the acrosomal vesicle. This vesicle condenses to form the acrosome, there being no acrosomal granule in both the species.
