Goa'uld & Tok'ra Symbiotes
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The Tok'ra: Tok'ra symbiote Selmak blends with willing host/partnerJacob Carter.  Selmak is uniquely pink. Pretense: Tok'ra forcibly remove mature symbiote Klorel from host Skaara.  No toxin excreted (Summit). Crossroads: Tanith, the mature Goa'uld symbiote with whom Shan'auc has communicated during Kel'No'Reem.
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Crossroads: The mature Tanith must take a host or Shan'auc dies, yet Amaunet was borne comfortably. Crossroads: Tanith launches himself at host Hebron, entering him through the throat soft tissue. The First Ones: Cleo, fossilised predatory primordial Goa'uld queen.  No naquadah in aboriginal Goa'uld.