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Allosaurus , from the Late Jurassic of North America and Europe, is a model taxon for Jurassic basal tetanuran theropod dinosaurs. It has achieved an almost iconic status due to its early discovery in the late, 19th century, and due to the abundance of material from the Morrison Formation of the western U.S.A., making  Allosaurus  one of the best-known theropod taxa. Despite this, various aspects of the cranial anatomy of  Allosaurus  are surprisingly poorly understood. Here, we discuss the osteology of the cheek region, comprised by the jugal, maxilla, and lacrimal. This region of the skull is of importance for  Allosaurus  taxonomy and phylogeny, particularly because  Allosaurus  has traditionally been reconstructed with an unusual cheek configuration, and because the European species  Allosaurus europaeus  has been said to be different from North American material in the configuration of these bones. Based on re-examination of articulated and disarticulated material from a number of repositories, we show that the jugal participates in the antorbital fenestra, contradicting the common interpretation. The jugal laterally overlies the lacrimal, and forms an extended antorbital fossa with this bone. Furthermore, we document previously unrecorded pneumatic features of the jugal of  Allosaurus .

Notes on the cheek region of the Late Jurassic theropod dinosaurAllosaurus