Figure 11 from: Sereno P (2012) Taxonomy, morphology, masticatory function and phylogeny of heterodontosaurid dinosaurs. ZooKeys 226: 1-225. https://doi.org/10.3897/zookeys.226.2840

Figure 11 - Premaxilla of Echinodon becklesii from the Lower Cretaceous Purbeck Formation of England. Left premaxilla in anterdorsolateral view (NHMUK 48209). Stereopair (A) and line drawing (B). Hatching indicates broken bone; dashed lines indicate estimated edges; tone indicates matrix. Scale bars equal 5 mm. Abbreviations: apmf anterior premaxillary foramen di diastema l left m1 maxillary tooth 1 nf narial fossa pm premaxilla pm1, 3 premaxillary tooth 1, 3 r right ru rugosity.