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

Evidence of selfing hermaphroditism in the clam shrimp Cyzicus gynecia (Branchiopoda: Spinicaudata)

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

The branchiopods display a broad range of reproductive modes, including dioecy, hermaphroditism and parthenogenesis. An order within Branchiopoda, Spinicaudata or the “clam shrimp” are also reported to have all three of these breeding systems; yet parthenogenesis has only been inferred on the basis of a lack of males in several clam shrimp species. Herein we report a detailed analysis of the breeding system of one of these supposed parthenogenetic clam shrimp: Cyzicus gynecia (Mattox, 1950). A RAPD genetic analysis across a three state geographic range (New Jersey, Massachusetts, and New York) showed high levels of genetic differentiation among populations indicative of reproduction without males. Additionally, functional male gametes were found to be produced in a small region of the gonad located just posterior to the head. Thus, we posit that the purported parthenogenetic females of C. gynecia are instead functioning hermaphrodites that produce a small amount of sperm anteriorly in an ovotestis that they then use to fertilize their own eggs. These findings suggest that there are, in fact, no parthenogenetic species within Spinicaudata, but rather all “female” species are most likely self-compatible hermaphrodites.

Affiliations: 1: 1Integrated Bioscience Program, Department of Biology, University of Akron, Akron, OH 44325-3908, USA; 2: 2Biology Department, City University of New York Graduate Center and Queens College, 65-30 Kissena Boulevard, Flushing, NY 11367, USA


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