Examples of perissodactyl mammals are horses, rhinoceroses and tapirs. Palaeotheriidae is an extinct family of herbivorous perissodactyl mammals related to equids. It is named after palaeontologist and perissodactyl expert Leonard Radinsky who died prematurely in 1985. There are many perissodactyl fossils of multivariant form. Obergfellia is an extinct genus of stem perissodactyl from the middle Eocene, discovered in 1980. He classified it as a perissodactyl and thought that it was closely related to "Menodus".