Yes, SILURIDS is a Scrabble word!

Letter values in Scrabble US: S 1, I 1, L 1, U 1, R 1, I 1, D 2, S 1.

Is it a valid word?

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

Old World freshwater catfishes having naked skin and a long anal fin more or less merged with the eellike caudal fin

Also: silurid fish.