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spiral valve

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spiral valve


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This indicates that these cololites are not from taxa that contained a spiral valve, and are thus not attributed to sharks or rays.
The narrow diameter of the spiral valve in the elasmobranch gastrointestinal tract would likely be too narrow to allow the undamaged passage of an object the size of a PSAT, even for a large shark.
The fish also has a long spiral valve in its intestine, which slows the passage of food and enables it to be more completely digested.
 
 
 
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