Petrosapiens are a crystalline species that can shoot and control crystals. They can make spears out of their arms (see picture) and bring crystals out of the ground. Many people think they're made of Taedenite, but they only look like it. Vilgax wiped all of them out, with the exception of Tetrax, but they were revived.They can be hurt by sonic waves.
In John Smith 10, they can be killed if their heads are destroyed. This is shown when Tetrax was killed by a sonic blast by destroying his head.
In OmniDragon 10, when they die, they can be revived if a diamond from their head is planted into Petropian earth and then forced to grow by Petrosapiens powers.
- Diamondhead (the Omnitrix's DNA sample of a Petrosapien)
- Tetrax Shard
- Ultimate Kevin (part petrosapien)
- Diamondhead (the Downgradetrix's DNA sample of a Petrosapien)
- Rhinestone (Dillon Million: Omniforce).
- Rehk (Half)
- Ultimate Diamondhead
- Ultimate Diamondhead (BTOU)
- Ultimate Diamondhead (Noah 10)
- Patrick (from the borg10 series)
- Evil Petrosapien (Chris 10: Total Revolution)
- Diamondhead (C10)
- Diamondguy (Michael 10)
- Igbrac Sharp
- Ahst Reflector
- Cameron Bruce
- Tetrax Shard (Ben 71 Franchise)
- Jonathan Tennyson (Unknown Episode)
- Threshold 1/5 Mutant Hybrid
- Petro (Ben 10: Unbound)
- Diamondhead (Earth-121)/Dimension 2
In The First Mission a Evil Petrosapien who was a ex student of the school attacks the students and Magister Hulka. Chris and Ethan are able to stop him till backup comes and arrest's him. For defeating him Magister Hulka pass's them both.