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re: eggshell request

Earlier I wrote:

>>Also, found a good paper on tuatara eggshell structure.
Seems it retains calcite crystals.

David Marjanovic wrote:

>>Why "retains"?

>>>>>

Turtles retain them, Archosaurs retain them, both split off from Lepidosaurs 
prior to tuatara.

Thus calcite crystal eggshell was lost somewhere between tuatara and iguana 
(perhaps, hence the earlier request for data) and geckos.

David Peters
St. Louis