1. Tame a spino

2. Tame the lowest level Rex, trike, Maewing or qoetzal ect you can find may not make sense now, but it’s gonna make sense in later steps(whichever is easiest to you)

3. Go to the swamp spot a rhyniognatha and than agro it

4. Kill (3-4) male rhyniognathas (with a Spino)

5. Look up a rhyniognatha trap were it can still attack you on YouTube

6. Trap a female rhyniognatha in said trap

7. Get it down to 10% health.

8. Get the low level creature that you tamed in step two

9. Put the pheromones you get from the male inside its inventory

10. Get the female Rhyniognatha at 10% health to attack creature tamed at step 2.