Phylogenetic significance of the structure of adult ovary and oogenesis in a primitive chilognathan diplopod, Hyleoglomeris japonica Verhoeff (Glomerida, Diplopoda)

Journal of Morphology
Kensuke Yahata, Toshiki Makioka

Abstract

Some histological details of the adult ovary of Hyleoglomeris japonica are described for the first time in the glomerid diplopods. The ovary is a single, long sac-like organ extending from the 4th to the 12th body segment along the median body axis, lying between the alimentary canal and the ventral nerve cord. The ovarian wall consists of a layer of thin ovarian epithelium which surrounds a wide ovarian lumen. A pair of longitudinal "germ zones," including female germ cells, runs in the lateral ovarian wall. Each germ zone consists of two types of oogenetic areas: 1) 8-12 narrow patch-shaped areas for oogonial proliferation, arranged metamerically in a row along each of the dorsal and ventral peripheries, and 2) the remaining wide area for oocyte growth. Oogonial proliferation areas include oogonia, very early previtellogenic oocytes, and young somatic interstitial cells, among the ovarian epithelial cells. The larger early previtellogenic oocytes in the oogonial proliferation areas are located nearer to the oocyte growth area, and migrate to the oocyte growth area. They are surrounded by a layer of follicle cells and are connected with the ovarian epithelium of the oocyte growth area by a portion of their follicles. They grow...Continue Reading

References

Jan 1, 1968·Zeitschrift für Zellforschung und mikroskopische Anatomie·D F Crane, R R Cowden
Jan 1, 1991·Tissue & Cell·J Kubrakiewicz

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