Diplocynodon sp. quadrate collected from the Oligocene Hamstead Beds of Hamstead, Isle of Wight. Diplocynodon is an extinct genus of alligatoroid; they were similar in appearance to the modern caiman and they exploited European waters between the Paleocene and middle Miocene. The quadrate is a bone which is in the skull of most tetrapods, its forms part of the jaw joint. Bones such as these provide useful information when interpreting a prehistoric environment e.g. the fauna present in the Hamstead beds suggests a predominantly freshwater environment with occasional marine influences.These specimens measure between 30 and 50 mm and are supplied in a small plastic bag with an information label.