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)
- Rehk (Half)
- Ultimate Diamondhead
- Ultimate Diamondhead (BTOU)
- Ultimate Diamondhead (Noah 10)
- Patrick (from the borg10 series)
- Diamondhead (C10)
- Diamondguy (Michael 10)
- Igbrac Sharp
- Ahst Reflector
- Cameron Bruce
- Threshold 1/5 Mutant Hybrid
- Petro (Ben 10: Unbound)
- Diamondhead (Earth-121)/Dimension 2
- Rhinestone (the Atomnitrix's DNA sample of a Petrosapien)
- Crystalshard (The Delta-X's DNA sample of a Petrosapien)