Lambertz, M. 2026. An Early Contribution to Chelonian Anatomy by Johannes Müller (1801–1858): The Drawings for the Zootomical Dissertation of Carl August Mohring (1799–1838) on the Osteology of Trionyx aegyptiacus from 1824. Bibliotheca Herpetologica 20(1):1–12.
Johannes Müller (1801–1858) undertook a study visit in Berlin with Karl Asmund Rudolphi (1771–1832) right after defending his dissertation during the early 1820s. During that time he worked on various subjects but did not publish any of it himself. However, he contributed the drawings for the plates that accompanied the dissertation of Carl August Mohring (1799–1838) in 1824. Mohring had received the task to describe the osteology of Trionyx triunguis, which was referred to as “Trionyx aegyptiacus”, and a specimen of which had been recently acquired for the anatomical-zootomical museum by Rudolphi. Friedrich Wilhelm Hemprich (1796–1825) and Christian Gottfried Ehrenberg (1795–1876) were at that time collecting in Egypt and Arabia and in friendly contact with Rudolphi, making them a likely source of origin for the specimen, which today has to be considered lost. Müller provided drawings of the skull in various views, and also of the entire articulated skeleton. These illustrations were at that time the most detailed representations of the anatomy of a trionychid turtle published. For Müller, these were his first contributions to comparative anatomy that actually surfaced in print.
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