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| Keywords: Mesosaurus tenuidens holotype original drawing.png en Historical drawing of a cast of the holotype specimen MNHN 1865-77 of the aquatic reptile Mesosaurus tenuidens G<small>ERVAIS</small> 1865 from the Lower Permian of South Africa The specimen consists of the anterior half of a skeleton in ventral view Note the thick heavy pachyostotic ribs a trait which is not unusual for secondary aquatic vertebrates du Mesosaurus tenudiens Reptile fossile de l'Afrique australe Académie des Sciences et Lettres de Montpellier Mémoires de la Section des Sciences 6 2 169-175 Paul Gervais 1865 PD-old-70-1923 Mesosaurus fossils | ||||
