This punctuated, even saltational increase in hominid skull sizes over time continues to be recognized in the literature.
Why would Eldredge and Gould propose such a model? Because they knew the data showed that potential transitional fossils are an extreme rarity.
Tiktaalik discoverer Neil Shubin from the University of Chicago searches for genetic clues between fish fins and tetrapod toes.
Considering the number of fossils attributed to the human lineage, an absence of such fossils for the great African ape lineages raises an obvious suspicion.
For those wedded to an evolutionary interpretation of life’s history, the fossil and genetic evidence leave the origin of arthropods a major mystery.