long, slanted contact. This shape is produced by an elongated postnarial process (rear prong) of the premaxilla, which extends below and behind the nares (nostril holes). The nasals (bones at the top edge of the snout) are poorly known, but were likely narrow and flat. A 2020 reinvestigation revealed that the front part of the nasals and the inner spur of the premaxillae are too short to keep the nares divided. This leaves a single central narial opening for the nostrils, opening upwards. An undivided naris is seen in few other archosauromorphs, namely rhynchosaurs, most allokotosaurs, modern crocodilians, and Teyujagua. The maxilla is triangular, peaking at mid-length and tapering to the front and rear. There were up to 14 or 15 teeth in the maxilla, though some individuals had fewer. T. longobardicus was a reptile with heterodont dentition, meaning that it had more than one type of tooth shape. In contrast to the simple fang-like premaxillary teeth, most or all of the maxillary teeth have a distinctive tricuspid shape, meaning that the crown was split into three stout triangular cusps (points). The central cusp was larger than the other two cusps, positioned in front and behind it on the crown. Among Triassic reptiles, early pterosaurs such as Eudimorphodon developed an equivalent tooth shape, and tricuspid teeth can also be found in a few modern lizard species. Some individuals of T. longobardicus have tricuspid teeth along their entire maxilla, while in others up to seven maxillary teeth are single-cusped fangs similar to the premaxillary teeth. The front edge of each orbit (eye socket) is marked by two bones; the prefrontal is tall and projects a low vertical ridge in front of the orbit. The small, sliver-shaped lacrimal is nestled further down along the maxilla. The lower edge of the orbit is formed by the jugal, a bone with a slender anterior process (front branch) and a somewhat broader dorsal process (upper branch). There is also a very short pointed posterior process (rear branch) which ends freely and fails to contact any other bone. The shape of the jugal in Tanystropheus is typical for early archosauromorphs; the underdeveloped posterior process indicates that the margin of the infratemporal fenestra (lower skull hole behind the eye) was incomplete and open from below. The postorbital bone, which links the jugal to the top of the skull, was tall and roughly boomerang-shaped, though poor preservation obscures