Turtle history:origin of shell (Introduction)
by David Turell 
, Tuesday, July 09, 2013, 15:42 (4156 days ago) @ David Turell
Turtles appear out of nowhere in the fossil record. The appearance of such a disadventageous form turns natural selection on its head. This article tries to explain the origin:-http://phys.org/news/2013-07-turtle-shell-mystery.html
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- Turtle history -
David Turell,
2012-11-19, 20:28
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- Turtle history: no shell fossil -
David Turell,
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- Turtle history: no shell fossil -
dhw,
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- Turtle history: no shell fossil -
David Turell,
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- Turtle history: no shell fossil -
dhw,
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- Turtle history: no shell fossil -
David Turell,
2018-08-24, 23:01
- Turtle history: no shell fossil -
dhw,
2018-08-24, 11:45
- Turtle history: no shell fossil -
David Turell,
2018-08-23, 18:40
- Turtle history: neck retraction -
David Turell,
2017-03-06, 18:22
- Turtle history:origin of shell -
David Turell,
2013-07-09, 15:42
- Turtle history:genetics -
David Turell,
2013-04-29, 15:49