What is "edaphodon"

Edaphodon was a prehistoric chimaeriform fish genus belonging to the family Callorhinchidae (sometimes assigned to Edaphodontidae). So, Edaphodon was a type of rabbitfish, a cartilaginous fish related to sharks and rays. Edaphodon has under 15 known species, all of which are extinct. This genus appeared in Aptian age (end of lower Cretaceous) and vanished in Pliocene. It was most prominent during the Late Cretaceous. All Edaphodon species were situated in the Northern Hemisphere, apart from E. kawai, which was recently discovered in the Chatham Islands near New Zealand. This shows the range of Edaphodon reached further than was previously thought.