26-11-2018, 08:49 PM
Your nr1 is especially convincing - JKP wrote about this as well. Since then I've been paying attention to the pattern down the middle, and it's generally used to draw the spines of critters that are seen from above. Invertebrates like insects can have this "spine", but frogs, lizards and so on as well. So I would say it's very likely You are not allowed to view links. Register or Login to view. alludes to some kind of bug with prominent mandibles.
I agree with Don though, it's historically impossible for one-cell organisms to be included.
I agree with Don though, it's historically impossible for one-cell organisms to be included.