Description: The William's Toad-head Turtle seems largely confined to northeastern Argentina, and is here seen at the Guira Oga wildlife rescue center in Iguazu. The local name is Tortuga Herradura. www.dixpix.ca/Amazon/fauna/riverlife/index.html. Date: 7 January 2013, 23:37. Source: Phrynops williamsi. Author: Dick Culbert from Gibsons, B.C., Canada.