Miriam points to this set of pictures of the development of the chicken embryo. As I have written before, I did have to learn how to precisely stage the chick embryos, both the older stages and the early stages, in order to manipulate them at exactly the right time. Cool pics.
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The diagram above shows the early cleavages of the embryo of the scaphopod mollusc, Dentalium. You may notice a few peculiarities: the first cleavage is asymmetric, producing a cell called AB and a larger sister cell, CD. Before the second division, CD makes a large bulge, called a polar lobe,…
PvM at the Panda's Thumb has already written a bit about this issue in the article "Human Gland Probably Evolved From Gills", but I'm not going to let the fact that I'm late to the party stop me from having fun with it. This is just such a darned pretty story that reveals how deeply vertebrate…
My previous contributions to the basic concepts in science collection were on gastrulation and neurulation, so let's add the next stage, and the one I named the blog after: the pharyngula.
First, though, a few general remarks on developmental stages. In some ways, these are somewhat arbitrary:…
Clarifying tetrapod embryogenesis, accurately
By OldCola
[Note from pzm: The text of this one is a little rougher than I like, but the content is interesting and addresses the claims of a character who has been lurking about here for a while, and whose work I've criticized before. If nothing else…
Along similar lines, you might appreciate this atlas of quail development:
http://131.215.15.121/
Coturnix in the 4th dimension.