Leptoceratopsidae is an extinct family of neoceratopsian dinosaurs from Asia and North America. They resembled, and were closely related to, other neoceratopsians, such as the families Protoceratopsidae and Ceratopsidae, but they are more primitive and generally smaller. Definitive leptoceratopsids have so far been found exclusively in the Late Cretaceous period (late Santonian - late Maastrichtian stages) of Asia and Western North America, however material referred to leptoceratopsids from the early Campanian of North Carolina and possibly Sweden extends their geographic range into Eastern North America and potentially Europe. A possible leptoceratopsid ulna, named Serendipaceratops, has been found in Victoria, Australia. However, a 2010 study showed that it could not be confidently refer