Live birth in lizards developed earlier than thought
|August 1, 2011||Posted by News under Evolution|
In “Fossil ‘is first pregnant lizard,'” (BBC News , July 21, 2011), Victoria Gill tells us of a lucky find in China: A 120-million-year-old fossil pregnant lizard, 30 cm long, very complete, and within days of giving birth to about a dozen sharply detailed embryos. And,
The fossil is especially interesting to scientists because it is a reptile that produced live young rather than laying eggs.
Only 20% of living lizards and snakes produce live young, and this shows it is an ancient, if unusual, trait.
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“It implies physiological adaptations, like adequate blood supply to the embryos and very thin shells – or no shells at all – to allow oxygen supply, evolved very early on.”
Apparently, mm was a Yabeinosaurus, thoght to be a “primitive” lizard.
File under: Change name of that “Overwhelming evidence for evolution” file cabinet to “Earlier than thought”
See also: Stone tools nearly two million years old, and Michael Cremo is still wrong?
No fossil rabbbits in the preCambrian, but what about complex cells?
Ancient and well-travelled worm
Earlier than thought: Freshwater animals