CREATE TABLE table_name_90 (authors VARCHAR(255), name VARCHAR(255), novelty VARCHAR(255), location VARCHAR(255))
What is Authors, when Novelty is Gen Nov, when Location is South Africa, and when Name is Criocephalosaurus?
    
SQL: SELECT authors FROM table_name_90 WHERE novelty = "gen nov" AND location = "south africa" AND name = "criocephalosaurus"