Tag: bilateral symmetry
Fossil Friday: Dickinsonia, the Ediacaran Animal that Wasn’t
Gregory Retallack is a kind of maverick paleontologist, who endorses a fringe hypothesis that Ediacaran organisms were not marine but terrestrial lichens.
Was Spriggina an Evolutionary Ancestor of Arthropods?
For those wedded to an evolutionary interpretation of life’s history, the fossil and genetic evidence leave the origin of arthropods a major mystery.
Namacalathus Revisited — Not Much to See
The new evidence is very ambiguous and totally inconclusive. No far-reaching conclusions should be drawn from such dubious material.
Scientific Paper Reaffirms New Genes Required for Cambrian Explosion
The notion that many genes would be required for the Cambrian explosion may seem unsurprising — what is surprising is that anyone would challenge the idea.
Namacalathus, Alleged Ediacaran “Animal,” Fails to Refute Abrupt Cambrian Explosion
It could be anything, from a coelenterate-grade or sponge-grade organism to even a protist or an alga.