amniote

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amniote

[′am·nē‚ōt]
(zoology)
An animal that develops an amnion during its embryonic stage; includes birds, reptiles, and mammals.
References in periodicals archive ?
Essentially, "turtles have the same body plan as other amniotes.
Knowing how a basic amniote embryo ends up developing into something so radically different could shed light on turtle history, says paleontologist Michael Lee of the South Australian Museum at the University of Adelaide.
The developing muscle tissue that would lie along adult ribs in a standard amniote began to fold underneath itself in the turtle.
Along with its surprises, the tetrapod from Cheese Bay also offers some confirmation for a 30-year-old theory about how amniotes arose.
In 1970, Carroll proposed that amniotes evolved from a line of miniature amphibians, much smaller than brutes like Acanthostega.
These modern amphibians that can lay eggs on land and have direct development suggested a model for a transitional animal between the aquatically reproducing amphibians and the terrestrially reproducing early amniotes," says Carroll.
These midgets, he suggests, were the ancestors of amniotes, and Casineria looks like the best candidate so far.
It's almost small enough to represent a transition between amphibians and amniotes, he suggests.