MadSci Network: Evolution

Subject: A comb as common ancestor for bilateralia and radiata?

Date: Wed Mar 20 19:48:40 2013
Posted by Barend
Grade level: undergrad School: Central Washington University - Dropout
City: Ellensburg State/Province: WA Country: USA
Area of science: Evolution
ID: 1363834120.Ev

Looking at ediacaran organism's staggered symmetry, a thought arose in me, then 
an intuition. Looking at staggered symmetry arrangements, you can make a comb 
like structure with a spine by alternating each segment between a spine segment 
and a tooth segment. This comb like structure can be rolled up, radially, into 
wheel where the teeth radiate outward and the spine segments combine together in 
the center as a hub, or the spine segments can serve as pivots that grow a tooth 
on one side, and then an inverted pivot that grows a tooth on the other, 
creating a bilaterally symmetric structure. I've drawn a picture here: . How good is this 
intuition, and what are the problems with it?

Re: A comb as common ancestor for bilateralia and radiata?

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