Abstract: Theropod footprint assemblages from the Sanjianfang Formation (Middle Jurassic) at the Shanshan tracksite, Turpan City, Xinjiang, northwest China are documented and re-described in detail. Together with new discoveries from this locality, they shed light on the different preservation and extramorphological variation of a total of 143 footprints. Ichnotaxonomically, they are assigned to the ichnospecies Changpeipus carbonicus, well known from other Jurassic tracksites of China. The presence of two distinct morphotypes, as has been proclaimed in earlier studies, is related to extramorphological variation on surfaces that indicate a soft, wet and slippery substrate. Anatomically based features supporting different ichnospecies are not present. Furthermore, the comparison with similar footprints from other localities suggests a monotypic ichnogenus Changpeipus with the type speciesC. carbonicus. Footprint lengths of 12.2 cm (a few isolated examples) to 47 cm at the Shanshan tracksites reflect small to medium-sized trackmakers that can be interpreted either as different age classes or different biological species. Peculiar preservational features include a footprint that documents slipping movement of the pes by three parallel bands obviously reflecting digits II, III and IV. An associated “normally” impressed tridactyl footprint suggests that both constitute a single step. The depositional environment was a gradually expanding and deepening lacustrine setting. This is also supported by the co-occurrence of abundant invertebrate trace fossils. Contrary to earlier interpretations resulting in an assignment to Lockeia the invertebrate traces are re-assigned here to the ichnogenus Fuersichnus that can be attributed to deposit-feeding insect larvae or other invertebrates. Fuersichnus is a characteristic dwelling and/or feeding burrow of muddy floodplains or lake margin settings.