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Figure 55 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 55 - Posterior dentition of Heterodontosaurus tucki from the Lower Jurassic Upper Elliot and Clarens formations of South Africa. Posterior half of worn maxillary and dentary tooth row in an adult skull in right lateral view (SAM-PK-K1332). Stereopair (A) of right posterior dentary tooth row tipped labially (laterally) exposing the wear facets in dorsolateral view. Stereopair (B) and line drawing (C) of the posterior half of the tooth rows in natural articulation in lateral view. Hatching indicates broken bone; grey tone indicates matrix; pink tone indicates wear facets; yellow tone indicates accessory wear surfaces. Scale bars equal 1 cm in A and B, 5 mm in C. Abbreviations: aws accessory wear surface be buccal emargination d dentary d5, 8, 11 dentary tooth 5, 8, 11 m maxilla m5, 8, 11 maxillary tooth 5, 8, 11 pc pulp cavity wf wear facet.
Figure 56 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 56 - Postcaniniform dentary tooth row of Heterodontosaurus tucki from the Lower Jurassic Upper Elliot and Clarens formations of South Africa. Worn right dentary tooth row in an adult skull (SAM-PK-K1332). Stereopair (A) and line drawing (B) in medial view. Dashed lines indicate estimated edges; tone indicates matrix. Scale bars equal 1 cm in A and B. Abbreviations: c coronoid d dentary d2, 8, 11 dentary tooth 2, 8, 11 fo foramen imf internal mandibular fenestra; Mc Meckel's canal sp splenial.
Figure 5 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 5 - More recent heterodontosaurid discoveries from southern Africa. A Partial skull of Abrictosaurus consors in left lateral view (NHMUK RU B54) B Lower jaws of Pegomastax africanus gen. n. sp. n. (SAM-PK-K10488) in right ventrolateral view. Scale bars equal 2 cm in A and 1 cm in B.
Figure 48 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 48 - Tooth structure, occlusion, and replacement in Heterodontosaurus tucki from the Lower Jurassic Elliot and Clarens Formations of South Africa.Successive horizontal computed-tomographic sections in cutaway view of a subadult skull (AMNH 24000). A Posterior portion of skull in right lateral view showing the location of horizontal cross-sections B, C Cross-sections (anterior toward top of page) through the maxilla. Abbreviations: j jugal m10, 11 maxillary tooth 10, 11 q quadrate qj quadratojugal rm9, 11 replacement maxillary tooth 9, 11.
Figure 45 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 45 - Tooth structure, occlusion, and replacement in Heterodontosaurus tucki from the Lower Jurassic Elliot and Clarens Formations of South Africa.Successive sagittal computed-tomographic sections in cutaway view of a subadult skull (AMNH 24000). A Posterior portion of skull in anterior view showing the location of sagittal cross-sections B, C Cross-sections in right lateral view through right maxillary and dentary rami. Abbreviations: pc pulp cavity rd11 replacement dentary tooth 11 rm11 replacement maxillary tooth 11 sac superior alveolar canal.
Figure 50 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 50 - Tooth structure, occlusion, and replacement in Heterodontosaurus tucki from the Lower Jurassic Elliot and Clarens Formations of South Africa.Successive horizontal computed-tomographic sections in cutaway view of a subadult skull (AMNH 24000). A Posterior portion of skull in right lateral view showing the location of horizontal cross-sections B, C Cross-sections (anterior toward top of page) through occluding portions of maxillary and dentary tooth rows.Abbreviations: d9, 10, dentary tooth 9, 10 m8-11 maxillary teeth 8-11 ocp occlusal plane q quadrate rm11 replacement maxillary tooth 11.
Figure 44 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 44 - Tooth structure, occlusion, and replacement in Heterodontosaurus tucki from the Lower Jurassic Elliot and Clarens Formations of South Africa.Successive coronal computed-tomographic sections in cutaway view of a subadult skull (AMNH 24000). A Posterior portion of skull in right lateral view showing the location of coronal cross-sections B Cross-section through maxillary tooth 10 and dentary tooth 9 C Cross-section through dentary tooth 11. Abbreviations: d dentary d9, 11 dentary tooth 9, 11 iac inferior alveolar canal j jugal m maxilla m10 maxillary tooth 10 ocp occlusal plane r replacement tooth rd11 replacement dentary tooth 11 sac superior alveolar canal sp splenial.
Figure 47 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 47 - Tooth structure, occlusion, and replacement in Heterodontosaurus tucki from the Lower Jurassic Elliot and Clarens Formations of South Africa. Successive sagittal computed-tomographic sections in cutaway view of a subadult skull (AMNH 24000). A Posterior portion of skull in anterior view showing the location of sagittal cross-sections B, C Cross-sections in right lateral view through left maxillary and dentary rami. Abbreviations: pc pulp cavity q quadrate rd10 replacement dentary tooth 10 rm11 replacement maxillary tooth 11.
Figure 64 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 64 - Pectoral girdle and forelimb of Heterodontosaurus tucki from the Lower Jurassic Upper Elliot and Clarens formations of South Africa. Pectoral girdle and forelimb of an adult skeleton (SAM-PK-K1332). Photograph (A) and line drawing (B) of the sternal plates and left forelimb in dorsal and medial view, respectively. Hatching indicates broken bone; dashed lines indicate estimated edges; tone indicates matrix. Scale bar equals 3 cm. Abbreviations: I, II digit I, II ar articular surface for a sternal rib C9 cervical 9 dc2 distal carpal 2 dpc deltopectoral crest fen fenestra h humerus hd head l left mc1, 2 metacarpal 1, 2 ph phalanx r rib or right ra radius rae radiale stp sternal plate ul ulna ule ulnare un ungual.
Figure 72 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 72 - Skeleton of Heterodontosaurus tucki from the Lower Jurassic Upper Elliot and Clarens formations of South Africa. Silhouette skeletal reconstruction in lateral view showing preserved bones (based on SAM-PK-K1332). Distal most caudal vertebrae unknown.
Figure 49 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 49 - Tooth structure, occlusion, and replacement in Heterodontosaurus tucki from the Lower Jurassic Elliot and Clarens Formations of South Africa. Successive horizontal computed-tomographic sections in cutaway view of a subadult skull (AMNH 24000). A Posterior portion of skull in right lateral view showing the location of horizontal cross-sections B Cross-section (anterior toward top of page) through the maxilla C Cross-section (anterior toward top of page) through occluding portions of maxillary tooth rows.Abbreviations: m8, 10, 11 maxillary tooth 8, 10, 11 pc pulp cavity q quadrate rm9, 11 replacement maxillary tooth 9, 11.
Figure 59 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 59 - Skull of Heterodontosaurus tucki from the Lower Jurassic Upper Elliot and Clarens formations of South Africa. New skull reconstruction in lateral view showing the dentition with intermediate wear (scleral ring not shown). Pink tone indicates wear facets. Abbreviations: a angular aantfe accessory antorbital fenestra adf anterior dentary foramen adi arched diastema antfo antorbital fossa apd articular surface for the predentary apmf anterior premaxillary foramen asaf anterior surangular foramen be buccal emargination bo basioccipital bt basal tubera c coronoid d dentary d2, d11 dentary tooth 2, 11 dbo dentary boss eantfe external antorbital fenestra emf external mandibular fenestra emfo external mandibular fossa en external naris f frontal iantfe internal antorbital fenestra j jugal jfl jugal flange jh jugal horn l lacrimal lrfo lateral retroarticular fossa m maxilla m1, 11 maxillary tooth 1, 11 n nasal nf narial fossa p parietal pap palpebral pd predentary pm premaxilla pm1, 3 premaxillary tooth 1, 3 pmfo promaxillary fossa po postorbital pof postorbital fossa popr paroccipital process prf prefrontal psaf posterior surangular foramen q quadrate qf quadrate foramen qj quadratojugal sa surangular sar surangular ridge sq squamosal.
Figure 68 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 68 - Hip and posterior trunk of Heterodontosaurus tucki from the Lower Jurassic Upper Elliot and Clarens formations of South Africa. Hip and posterior trunk in an adult skeleton (SAM-PK-K1332). Photograph (A) and line drawing (B) of the left ilium and pubis and sacral vertebrae in left lateral view. Hatching indicates broken bone; dashed lines indicate estimated edges; tone indicates matrix. Scale bar equals 3 cm. Abbreviations: ant antitrochanter CA caudal vertebra cat coossified anterior trochanter ch chevron D dorsal vertebra fe femur il ilium is ischium l left of obturator foramen ot ossified tendon poap postacetabular process pped pubic peduncle prap preacetabular process pu pubis r rib S sacral vertebra tp transverse process.
Figure 63 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 63 - Presacral vertebrae of Heterodontosaurus tucki from the Lower Jurassic Upper Elliot and Clarens formations of South Africa. Cervical and anterior dorsal vertebrae and ribs of an adult skeleton (SAM-PK-K1332). Stereopairs of C1-3 (A), C4-6 (B), and C7-D4 (C) in left lateral view. Scale bars equal 2 cm in A and B, 3 cm in C.
Figure 43 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 43 - Tooth structure, occlusion, and replacement in Heterodontosaurus tucki from the Lower Jurassic Elliot and Clarens Formations of South Africa. Successive coronal computed-tomographic sections in cutaway view of a subadult skull (AMNH 24000). A Posterior portion of skull in right lateral view showing the location of coronal cross-sections B Cross-section through maxillary tooth 9 and dentary tooth 7 C, D Cross-sections through maxillary tooth 9 and dentary tooth 8. Abbreviations: d7-9 dentary teeth 7-9 m9, 10 maxillary tooth 9, 10 ocp occlusal plane pc pulp cavity rm9 replacement maxillary tooth 9.
Figure 42 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 42 - Posterior dentition of Heterodontosaurus tucki from the Lower Jurassic Upper Elliot and Clarens formations of South Africa. Tooth wear and replacement in posterior maxillary and dentary teeth in a juvenile skull (AMNH 24000). Stereopair (A) and line drawing (B) in left lateral view. Hatching indicates broken bone; grey tone indicates matrix; pink tone indicates wear facets. Scale bars equal 5 mm in A and B. Abbreviations: d dentary d8-10 dentary tooth 8–10 m maxilla m10, 11 maxillary tooth 10, 11 pc pulp cavity pri primary ridge ri ridge wf wear facet.
Figure 40 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 40 - Posterior end of the skull of Heterodontosaurus tucki from from the Lower Jurassic Upper Elliot and Clarens formations of South Africa. Posterior portion of a juvenile skull (AMNH 24000). Stereopair (A) and line drawing (B) in right lateral view. Hatching indicates broken bone; dashed lines indicate estimated edges; grey tone indicates matrix; pink tone indicates wear facets. Scale bars equal 1 cm in A and B. Abbreviations: aa articular surface for angular aqj articular surface for quadratojugal asaf anterior surangular foramen d dentary d7, 11 dentary tooth 7, 11 j jugal jfl jugal flange l left m maxilla m8, 11 maxillary tooth 8, 11 psaf posterior surangular foramen q quadrate qj quadratojugal r right sa surangular wf wear facet.
Figure 61 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 61 - Jaw joints of Heterodontosaurus tucki from the Lower Jurassic Upper Elliot and Clarens formations of South Africa. Dentary symphysis and quadrate-articular jaw joint A Reconstruction of the anterior portion of the right dentary in medial view (based on SAM-PK-K1332) B Reconstruction of the anterior end of the lower jaws in ventral view (based on SAM-PK-K1332) C Stereopair of the right lower jaw joint in lateral view (the lateral edge of the quadrate condyle and articular are broken away exposing the tight jaw articulation) in a subadult skull (AMNH 24000) D Stereopair of the left lower jaw joint in lateral view (the lateral edge of the quadrate condyle is broken away exposing the inclined trough of the jaw articulation) in a subadult skull (AMNH 24000). Scale bar equals 1 cm in C and D. Abbreviations: d dentary d1, 2 dentary tooth 1, 2 dbo dentary boss fo foramen Mc Meckel's canal pd predentary sym symphysis symt symphyseal trough vp ventral process.
Figure 4 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 4 - Controversial early heterodontosaurid specimen from southern Africa. Drawing of specimen NHMUK RU A100 as embedded in matrix in A top and B bottom views (from Thulborn 1970). Abbreviations: F frontal JL left jugal JR right jugal LTF left lateral temporal opening MDR right mandible MXL left maxilla MXR right maxilla N left nasal PMXR right premaxilla PO postorbital STF supratemporal fossa. Scale bar equals 5 cm.
Figure 70 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 70 - Hindlimb of Heterodontosaurus tucki from the Lower Jurassic Upper Elliot and Clarens formations of South Africa. Tibiotarsus in an adult skeleton (SAM-PK-K1328). Photograph (A) and line drawing (B) of the right tibiotarsus in anterior view. Hatching indicates broken bone; dashed lines indicate estimated edges; tone indicates matrix. Scale bar equals 5 cm. Abbreviations: as astragalus asp ascending process at anterior trochanter ca calcaneum cc cnemial crest fi fibula ti tibia.
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