Petalodontidae
plural noun
Pet·al·o·don·ti·dae
: a family of Carboniferous and Permian elasmobranchs (subclass Holocephali) related to the rays and having peculiar flattened petaloid teeth and greatly enlarged pectoral fins see petalodus
Word History
Etymology
New Latin, from Petalodont-, Petalodus, type genus + -idae