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Scientists
have described what they say is the first known fossil of a four-legged
snake. The limbs of the 120-or-so-million-year-old, 20-centimeter-long
creature are remarkably well preserved and end with five slender digits
that appear to have been functional. Thought to have come from Brazil,
the fossil would be one of the earliest snakes found, suggesting that
the group evolved from terrestrial precursors in Gondwana, the southern
remnant of the supercontinent Pangaea. But although the creature’s
overall body plan -- and indeed, many of its individual anatomical
features -- is snakelike, some researchers aren’t so sure that it is a part
of the snake family tree. The team’s scientific interpretation may be the least controversial aspect of the discovery, which they report online today in Science. More
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