Eodiscoglossus is an extinct genus of prehistoric frogs. It is known from the type species E. santonjae from the Early Cretaceous (Barremian) El Castellar Formation of Spain, as well as a referred species E. oxoniensis known from the Forest Marble Formation of the UK[1][2][3] and an indeterminate species from the Dzunbain Formation of Mongolia.[4] It was a small primitive frog, with a length of only 27 mm (1.1 in) from the premaxilla to the ischium.[2] Formerly considered to be closely related to discoglossids, E. santonjae is now regarded as close to the root of the crown group of modern frogs[3] in a position more derived than New Zealand frogs and tailed frogs, but more basal than costatans like alytids and other more advanced frogs like neobatrachians. The morphology of E. santonjae suggests a generalist and unspecialised movement habit.[5] The referral of E. oxoniensis to Eodiscoglossus has been questioned, as it is much earlier than the type species and it is based on homoplasic and plesiomorphic characteristics inherited from a common ancestor, so there is no clear evidence of a close relation.[6]
