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When is secondary feature not a secondary feature?

 I'm pretty sure its the right word.

Example first: cold-blooded reptiles gave rise to warm-blooded descendants, 
which gave rise to cold-blooded crocodilians - crocs are secondarily 

Question:  is there an upper limit to how much time may pass between the first 
and last?  IE, if an island species of Cetiosaurs or Titanosaurs had returned 
to the omnivory/carnivory of their pre-Sauropod ancestors, would we say that 
they are "secondarily-carnivorous Titanosaurs"?  or would we simply say they 
are "carnivorous Titanosaurs"?

thank you.

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