Gregory Retallack is a kind of maverick paleontologist, who endorses a fringe hypothesis that Ediacaran organisms were not marine but terrestrial lichens.
For those wedded to an evolutionary interpretation of life’s history, the fossil and genetic evidence leave the origin of arthropods a major mystery.
The new evidence is very ambiguous and totally inconclusive. No far-reaching conclusions should be drawn from such dubious material.
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.
It could be anything, from a coelenterate-grade or sponge-grade organism to even a protist or an alga.