Sources Everywhere

Diplocaulus has made it into books that discuss its relationship to sister taxa and structures, though 1917 is one of the last prominent examples of this. Many examples of the fossils exist. Enough, in fact, that growth series of the lepospondyl have been stastically analysed and the number of stages in that growth series have been hypothesized. My favorite, of course, is the S.W. Williston description of the skull and extremeties of Diplocaulus. In true Williston fashion the articled is back-ended by quality hand drawings of the skull and parts of the limbs from multiple angles. He even includes a plate labelled with the bones, which is always nice.