They are Tailess whip scorpions/spiders "Amblypygi" They are a order of arachnids along side Spiders and Scorpions+others.
They are harmless, cannot sting no venom,ect, very interesting,
The mantids common names that are in the pictures above are "Ghost mantis" Orchid mantis" Cryptic...
The Tailess whip scorpions are great, they look creepy, but are harmless!!
They live communally in a glass arboreal tank filled with cork bark, they are always out, very interesting creatures to keep, I have 5x adults now too:)