The pre-Cambrian animal rollover: A micro-evolutionary event becomes a major macro-evolutionary distinction in 600 million years.
At 10am Central tomorrow morning, you can watch this video about the dorsal-ventral inversion of key signaling molecules in the developing embryo. Or you can watch it on Patreon right now if you’re a member.
This is a discussion of this paper:
De Robertis EM, Tejeda-Munoz N (2022) Evo-Devo of Urbilateria and its larval forms. Developmental Biology 487:10-20.
Dear PZ, I enjoyed the video, and understood the basics of it regarding embryonic development, even though my level of sophistication in biology is limited.
However, regarding dorsal-ventral inversion, in a societal context, as I understand it most of us humans have our anal sphincters at the bottom, but Corporations have their anal sphincters at the top !
Lobsters being sideways fish? Did you miss an opportunity for a Jordan Peterson lobster people joke or did I miss it?
Also Halibut! Plus Flounder and other “Flatfish” that kinda transform themselves sideways over their lives
Like this example seen over just 39 seconds – Flatfish Metamorphosis – although it doesn’t turn into a crustacean.
PS You do have me wondering now what flavours bacteria have or might come in..
Plus, not to flounder around too much on this but folks can also see this YT one – via the Science Dream channel lasting almost 7 minutes.