333X: SciFi Plot Fragment – Tacretude, species on the run from galactic gene police

I read this book at the Boulder Library, it was written in this century (I think).
The plot was a little reminiscent of Sundiver.  It was a story of species (humans among them) who were on the run from galactic genetic police.  The time scales were long enough for tectonic plate subduction to bury middens.  A species’ essential nature and behavior was called Tarcretude or Tacreteude.

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