Abstract The Late Jurassic Slottsmøya Member Lagerstätte on Spitsbergen offers a unique opportunity to study the relationships between vertebrate fossil preservation, invertebrate occurrences and depositional environment. In this study, 21 plesiosaurian and 17 ichthyosaur specimens are described with respect to articulation, landing mode, preservation, and possible predation and scavenging. The stratigraphic distribution of marine reptiles in the Slottsmøya Member is analysed, and a correlation between high total organic content, low oxygen levels, few benthic invertebrates and optimal reptile preservation is observed. A new model for 3D preservation of vertebrates in highly compacted organic shales is explained. Supplementary material: A taphonomic description of each marine reptile specimen is available at https://doi.org/10.6084/m9.figshare.c.2133549

Abstract: A pterosaur humerus (PRC 64) from the Upper Jurassic of Thailand was initially assigned to the Azhdarchoidea, an important clade of edentulous Cretaceous pterodactyloid pterosaurs. Here it is reassigned, on the basis of morphological comparisons and a phylogenetic analysis, to the Rhamphorhynchidae, a widely distributed clade of small to medium-sized seemingly piscivorous basal pterosaurs. This record extends the geographical range of rhamphorhynchids and confirms recent findings that these pterosaurs inhabited continental as well as marginal marine ecosystems.