Turtle history:origin of shell

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

Complete thread:

Turtle history David Turell 2012-11-19, 08:28 PM
- Turtle history:genetics David Turell 2013-04-29, 02:49 PM
  - Turtle history:origin of shell David Turell 2013-07-09, 02:42 PM
    - Turtle history: neck retraction David Turell 2017-03-06, 06:22 PM
      - Turtle history: no shell fossil David Turell 2018-08-23, 05:40 PM
        
        Turtle history: no shell fossil dhw 2018-08-24, 10:45 AM
        
        Turtle history: no shell fossil David Turell 2018-08-24, 10:01 PM
        
        Turtle history: no shell fossil dhw 2018-08-25, 10:09 AM
        
        Turtle history: no shell fossil David Turell 2018-08-25, 05:15 PM
        
        Turtle history: no shell fossil dhw 2018-08-26, 07:50 AM
        
        Turtle history: no shell fossil David Turell 2018-08-26, 02:39 PM
        
        Turtle history: a review of aquatic species David Turell 2024-03-14, 05:31 PM
        
        Turtle history: leatherback migrations David Turell 2024-03-16, 06:23 PM

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Turtle history:origin of shell (Introduction)