The initial description of "Incisivosaurus" showed that the skull, about 10 cm in length (4 inches), had the most complete dentition known for any oviraptorosaur. Their cladistic analysis indicated that "Incisivosaurus" lies at the base of the oviraptorosaurs, making it more basal than "Caudipteryx" and "Oviraptor". The distinguishing skeletal features of "Incisivosaurus", include a long snout that made up about half the total length of the skull, a slender lower jaw with a long fenestra (opening), and its distinctive, large, flattened front teeth. In addition to these unique features, "Incisivosaurus" shared many traits with more typical oviraptorosaurs, so it is classified in that group. 