See text Myriacanthidae is an extinct family of holocephalan cartilaginous fish, closely related to living chimaeras.

[1] Like other cartilaginous fish, most myriacanthids are only known from their teeth (and in a few cases their fin spines), though a handful of species are known from partial skeletons which preserve the cartilage.

[1] Members of Myriacanthidae generally have elongate rostra with long frontal claspers.

Like living chimaeras, myriacanthids probably consumed a variety of invertebrate prey.

[2]46 Traditionally, Myriacanthidae has been considered one of two families within the clade Myriacanthoidei, alongside the monotypic family Chimaeropsidae (which only contains Chimaeropsis, which lacks the distinctive rostrum that characterises typical myriacanthids),[2]46,112,124[3] though some studies have placed this genus within Myriacanthidae as traditionally defined.