BP6-3Q1 insects
From The Stargate Omnipedia
Insects grown from the dead remains of other organisms. Whether these creatures originated from BP6-3Q1 or from somewhere else is a mystery, as it is a hazard to visit the planet. They are a plague to be contained, as confronting them may prove extremely difficult.
The creatures' venomous stinger injects a user with the genetic codes necessary to rewrite their DNA and create more of the insects.
KEY EPISODE
Bane - Teal'c is infected by one of the insects and starts to undergo a genetic transformation similar to that planet's inhabitants.