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

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 fo...

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Bibliographic Details
Published in:Evolution 1996-08, Vol.50 (4), p.1520-1540
Main Authors: Jo A. M. van den Biggelaar, Haszprunar, G.
Format: Article
Language:English
Subjects:
Analysis
Blastomeres
Capsules
Cell lines
Cleavage pattern
Daughter cells
Eggs
Embryos
Evolution
Flowers & plants
Gastropoda
gastropods
Genetic aspects
Genetics
Mesoderm
mesodermal stem cell
Mollusca
phylogeny
Quadrants
Stem cells
Taxa
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Summary: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.
ISSN:0014-3820
1558-5646
DOI:10.1111/j.1558-5646.1996.tb03925.x