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The present doctoral dissertation comprises new studies on the fossil vertebrate assemblage recovered from the late Early Jurassic marine “Green Series” clay deposits of Grimmen and Dobbertin in north-eastern Germany that contribute to fill the gap of knowledge regarding its faunal composition and its relevance for understanding Early Jurassic vertebrate life. The investigations led to the recognition of wide range of vertebrate taxa, including basal gravisaurian sauropods, secondarily marine reptiles, a diverse fauna of leptolepid fishes, and a new genus and species of pycnodontiform fishes. In addition, a taxonomic revision of the Early Jurassic saurichthyid fish Saurorhynchus was performed, leading to the identification of two new, previously unnamed species. The results provide new insights into the taxonomic, systematic, and ecological diversity of Early Jurassic vertebrates, and hence add significant new data to our knowledge on Lower Jurassic vertebrate palaeobiodiversity patterns.
Certain basal Teleostei from the Early Jurassic of Mecklenburg-Western Pomerania (Germany) and the Late Jurassic of the Franconian Alb (Bavaria, Germany), the Swabian Alb (Baden-Württemberg, Germany) and the western Jura-Mountains (Ain, France) are described. The present doctoral dissertation includes four studies, dealing with representatives of “Pholidophoriformes”, Leptolepidae and Orthogonikleithridae. These studies include anatomical descriptions of new taxa and reviews of poorly known fishes. Furthermore, the stratigraphic and palaeobiogeographical distributions of the examined taxa are discussed.