Abstract
Light and electron microscopy were used to examine the sequential changes in embryos and maternal reproductive tubules in the vaejovid scorpion, Paruroctonus mesaensis. The early stages are described, from oogenesis to the time of embryogenesis just before spiracles and booklungs begin to appear. The oocytes and associated trophic cells originate in the epithelium of the maternal ovariuterine tubules. Each oocyte with follicle (primary trophic) cells forms a protuberance on the tubular surface. After fertilization and cleavage, the morula appears to be pulled into the tubular lumen by tissue invaginated from the wall opposite the protuberance. Secondary trophic cells originating near each oocyte form a trophic layer parallel and connected to the ovariuterine tubules. These cells encircle the tubular epithelium and apparently induce or transform it to a trophic mode. Within the tubules, each embryo develops in a specialized region (uterus) where the embryo abuts a cell mass (follicular placenta). The latter, along with the tubular and uterine epithelia, apparently releases nutrients that are absorbed through the embryo epidermis. The main structures of the embryo body develop from the germinal disc of the blastula. Segments and ...Continue Reading
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