Yes, PERIPATUS is a Scrabble word!

Letter values in Scrabble US: P 3, E 1, R 1, I 1, P 3, A 1, T 1, U 1, S 1.

Is it a valid word?

PERIPATUS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms

Also: velvet worm.