 As neoselachians (group of modern sharks) diversified further during the Late Jurassic, hybodontiforms became less prevalent in open marine conditions but remained diverse in fluvial and restricted settings during the Cretaceous.By the Cretaceous, hybodontiforms were primarily (though not solely) restricted to freshwater settings.They remained successful during the Cretaceous by adapting to freshwater conditions, for example seven genera were found in freshwater deposits from Thailand.