Arandaspis prionotolepis

Arandaspis is an extinct genus of jawless fish that lived in Australia during the early Ordovician period around 480 to 470 million years ago. It contains two species, A. prionotolepis and A. sp.

== Discovery == Its remains were found in the Stairway Sandstone near Alice Springs, Australia in 1959, but it was not determined that they were the oldest known vertebrates until the late 1960s. The discovery of Arandaspis makes it one of the first record of a Ordovician vertebrate from the southern hemisphere.