Cookies Policy

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here


No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.

Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

Access this article

+ Tax (if applicable)
Add to Favorites
You must be logged in to use this functionality

image of Journal of Crustacean Biology

ABSTRACT Eggshell ultrastructure is described in a branchiuran, Argulus japonicus. Growing oocytes of various sizes are found on the outer surface of the ovary. They are protruded outward, covered by a thin basal lamina of the ovarian epithelium which connects them on the ovarian surface. Many microvilli develop on the surface of oocytes from the late previtellogenic stage. These microvilli elongate to raise the basal lamina from the oocyte surfaces. In the early vitellogenic oocytes, large and small electron-dense granules appear and increase in number in the outer and inner regions, respectively, of the perivitelline space between the basal lamina and the oocyte surfaces. In the late vitellogenic oocytes, other large electron-lucent granules appear and increase in number in the innermost region of the perivitelline space. Mature eggs in the oviduct have a two-layered eggshell: the outer layer composed of large electron-dense granules and the inner layer of small electron-dense granules and large electron-lucent granules. Some unique features on the origin and formation of the eggshell in A. japonicus are discussed.


Full text loading...


Data & Media loading...

Article metrics loading...



Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to ToC alert
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Your details
    Why are you recommending this title?
    Select reason:
    Journal of Crustacean Biology — Recommend this title to your library
  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation