tetrapods

Although this pattern of genes clearly helps to make hands and feet today in tetrapods, that may not be their original intent, Shubin said.

Ancestral Expression Patterns 2007

"We found that the genetic capability seen in tetrapods to build limbs is present in even more primitive fish," said lead author Marcus Davis, PhD, a postdoctoral fellow in Neil Shubin's lab at the University of Chicago.

Ancestral Expression Patterns 2007

The scientists studied the development of paddlefish fins to test whether the genes activated to make hands and feet in tetrapods were different from the genes activated to make fish fins.

Ancestral Expression Patterns 2007

"We found that the genetic capability seen in tetrapods to build limbs is present in even more primitive fish," said lead author Marcus Davis, PhD, a postdoctoral fellow in Neil Shubin's lab at the University of Chicago.

Ancestral Expression Patterns 2007

"We found that the genetic capability seen in tetrapods to build limbs is present in even more primitive fish," said lead author Marcus Davis, PhD, a postdoctoral fellow in Neil Shubin's lab at the University of Chicago.

Ancestral Expression Patterns 2007

I'm starting to notice a common theme to many of your posts: that the diversity of extant and recently-extinct tetrapods is considerably greater than what has so far been described.

The small, recently extinct, island-dwelling crocodilians of the south Pacific Darren Naish 2006

Some plethodontids curl up into a ball and roll downhill to escape predators (García-París & Deban 1995), a behaviour reported elsewhere in tetrapods among pangolins by the way (Tenaza 1975).

Archive 2006-06-01 Darren Naish 2006

For nearly 80 years, palaeontologists have been scouring the planet for fossil bones and skeletons of the earliest land vertebrates or "tetrapods" - the ultimate progenitors of all later amphibians, reptiles, birds and mammals, including ourselves.

Gaea Times (by Simple Thoughts) Breaking News and incisive views 24/7 2010

Amphibians like this one -- in the large category of four-limbed creatures called tetrapods -- stand near the base of the evolutionary tree, between the fish that came before them and the birds and mammals that followed.

BETWEEN SWIMMING AND CRAWLING 2007

Earliest four-limbed animals left mud tracks animals, called tetrapods, crawled on land much earlier than scientists thought, judging by tracks left behind by some of the animals in a prehistoric

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