Central American River Turtle, carapace from dorsal (left) and young animal (right)
G.H.Ford
1870
<i>Proceedings of the Zoological Society of London</i> (<a rel="nofollow" class="external text" href="https://archive.org/details/proceedingsofgen70zool">vol. 1870</a>, <a rel="nofollow" class="external text" href="https://archive.org/stream/proceedingsofgen70zool#page/n819/mode/1up">plate XLII</a>)