Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Cleavage Patterns and Mesentoblast Formation in the Gastropoda: An Evolutionary Perspective

Jo A. M. van den Biggelaar and G. Haszprunar
Evolution
Vol. 50, No. 4 (Aug., 1996), pp. 1520-1540
DOI: 10.2307/2410889
Stable URL: http://www.jstor.org/stable/2410889
Page Count: 21
  • Read Online (Free)
  • Download ($4.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Cleavage Patterns and Mesentoblast Formation in the Gastropoda: An Evolutionary Perspective
Preview not available

Abstract

The larger gastropod taxa are characterized by distinctive cleavage patterns. The cell stage at which the mesentoblast is formed appears to be crucial. In none of the taxa is it formed earlier than the 24- and not later than the 63-cell stage. A heterochronic shift from late to early mesentoblast formation appears to coincide with successive steps in gastropod evolution. Comparison of the early cleavage patterns appears to be a powerful method for investigating the evolutionary relations between major gastropod taxa.

Page Thumbnails

  • Thumbnail: Page 
1520
    1520
  • Thumbnail: Page 
1521
    1521
  • Thumbnail: Page 
1522
    1522
  • Thumbnail: Page 
1523
    1523
  • Thumbnail: Page 
1524
    1524
  • Thumbnail: Page 
1525
    1525
  • Thumbnail: Page 
1526
    1526
  • Thumbnail: Page 
1527
    1527
  • Thumbnail: Page 
1528
    1528
  • Thumbnail: Page 
1529
    1529
  • Thumbnail: Page 
1530
    1530
  • Thumbnail: Page 
1531
    1531
  • Thumbnail: Page 
1532
    1532
  • Thumbnail: Page 
1533
    1533
  • Thumbnail: Page 
1534
    1534
  • Thumbnail: Page 
1535
    1535
  • Thumbnail: Page 
1536
    1536
  • Thumbnail: Page 
1537
    1537
  • Thumbnail: Page 
1538
    1538
  • Thumbnail: Page 
1539
    1539
  • Thumbnail: Page 
1540
    1540