2022-06-202022-06-20197423172880https://hdl.handle.net/10657/9507The ovary of Pennons aztecus is located in the dorsal cephalothorax and consists of anterior, lateral, and posterior lobes. Follicular egg development is exhibited, with the follicular cell layer present until spawning. Vitellogenesis may be divided into early and late production of yolk materials. The swelling of short discontinuous elements of rough endoplasmic reticulum is responsible for the early (intracellular) aspect of yolk production. Micropinocytotic uptake of materials at the oolemma and the subsequent fusion of the micropinocytotic vesicles contribute to the late (extraoocytic) phase of yolk platelet production. The most striking morphological attribute of the mature oocyte is the presence of large cortical rods. These rods demonstrate a partial cortical reaction prior to spawning and a subsequent "explosive" ejection of their contents at spawning.application/pdfenThis item is protected by copyright but is made available here under a claim of fair use (17 U.S.C. Section 107) for non-profit research and educational purposes. Users of this work assume the responsibility for determining copyright status prior to reusing, publishing, or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions requires express permission of the copyright holder.Thesisreformatted digital