Gametogenesis and fertilization in the Mesozoan Dicyema aegira

  title={Gametogenesis and fertilization in the Mesozoan Dicyema aegira},
  author={C. R. Austin},
  pages={597 - 600}
Evidence is presented of a periodicity of oogenesis and spermatogenesis in D. aegira. Pauses in oogenesis were detected between successions of oogonial divisions; in spermatogenesis, the intervals appeared to be longer and the pauses came before division of primary spermatocytes. Regulation of division rates was such that between two and three times as many spermatozoa as oocytes were produced. Observations indicated that spermatozoa emerged from the axial cell soon after their formation and… 

Reproductive traits in dicyemids

Several characters involved in the life cycle in dicyemids were examined to understand reproductive strategy and adaptations to cephalopod hosts and an inverse proportional relationship was found between the number of infusorigens and the gametes, suggesting a trade-off between them.

The cell lineages of two types of embryo and a hermaphroditic gonad in dicyemid mesozoans

The present review summarizes the patterns of cell division and the cell lineages of the two types of embryo, namely, the vermiform embryo and infusoriform embryo, of the dicyemid mesozoan Dicyema

Developmental patterns of the hermaphroditic gonad in dicyemid mesozoans (Phylum Dicyemida)

The development of the hermaphroditic gonad, the infusorigen, was studied in fixed specimens of 16 species belonging to four genera of dicyemid mesozoans and found that mature infusorigens are similarly organized in all species examined.

Electron Microscopic Studies on Dicyemid Mesozoa. II. Infusorigen and Infusoriform Stages

In the dicyemid mesozoans, infusorigens develop from infusorigen mother cells found within the axial cells of rhombogens, and it is suggested that eosinophilic granules within the capsule cells might perform some sort of lytic function, possibly serving in the release of the urn cells from the infusOriform.

How the sperm lost its tail: the evolution of aflagellate sperm

  • E. H. Morrow
  • Biology
    Biological reviews of the Cambridge Philosophical Society
  • 2004
Weak evidence is provided suggesting that the evolution of aflagellate sperm could be linked to the removal of selective pressures generated by sperm competition, which occurs when the sperm of two or more males compete to fertilize a female's ova.

Marine Flora and Fauna of the Eastern United States Dicyemida

This manual treats the six species of dicyemid mesozoans from the eastern coast of North America and the Gulf of Mexico, including the Florida Keys, which are parasites of species of Octopus and are in the genus Dicyema, family Dicyemidae.

Mesozoan parasites of Octopus vulgaris

  • Lam. from Florida. J. Parasit
  • 1952

Les dicyemides . l re partie : systematique , generations vermiformes , infusorigene et sexualite

  • 1947

Dicyemid mesozoans from the Gulf of Mexico

  • J . Parasit .
  • 1957