user: Question: What is Authors, when Novelty is gen et sp nov, and when Name is Lanthanocephalus?
Columns: ['Name', 'Novelty', 'Status', 'Authors', 'Location']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Criocephalosaurus', 'gen nov', 'Valid', 'Kammerer & Sidor', 'South Africa']
SQL:

assistant: SELECT "Authors" FROM "Table" WHERE "Novelty" = 'gen et sp nov' AND "Name" = 'Lanthanocephalus';