sentences:  All istiodactylid remains are known from deposits in the Northern Hemisphere, dating from the Barremian–Aptian ages of the Early Cretaceous period.They are distinguished from other pterosaurs by features such as the shape and position of their teeth, broad snouts, narrowed orbits, and large naso-antorbital fenestrae.The cladogram below follows Witton's 2012 analysis, wherein he found Istiodactylidae to consist of five taxa (the first three species listed are outgroup or reference taxa)