It’s covered in the later Frank Herbert books via a trail of various, disparate clues. The worms were created by mankind to produce spice (and are possibly genetically engineered post-humans) and then seeded onto Arrakis with the intent of turning it into a dedicated spice-production planet. Spice and the worms were never natural.
Is that some canon that I’m too not reading Brian Herbert to understand?
It’s covered in the later Frank Herbert books via a trail of various, disparate clues. The worms were created by mankind to produce spice (and are possibly genetically engineered post-humans) and then seeded onto Arrakis with the intent of turning it into a dedicated spice-production planet. Spice and the worms were never natural.
Are you sure you’re thinking worms and not tleilaxu axlotl tanks that produce spice later in the timeline?
Yes, the worms. I think Leto II even states it matter-of-fact in God Emperor, but I’d have to find the exact quote.
Did you read Chapterhouse? If not … then yes.