Contributions to Zoology, 71 (1/3) (2002)

Divergence and convergence in early embryonic stages of metazoans

Frietson Galis , Barry Sinervo

Institute of Evolutionary and Ecological Sciences, Leiden University P.O. Box 9516, 2300 RA Leiden, Netherlandsgalis@rulsfb.leidenuniv.nl

Biology Department, University of California Santa Cruzsinervo@biology.ucsc.edu

Keywords: evolutionary conservation, pleiotropy, cleavage, gastrulation, organogenesis, multicellularity, phylotypic stage