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Fig. 21 in The Perinate Skull of Byronosaurus (Troodontidae) with Observations on the Cranial Ontogeny of Paravian Theropods

Fig. 21. Scanning electron microscopy images (A–C) of a portion of dentary and associated dentition removed from the left side of IGM 100/972. The teeth are set relatively low in a dental groove but are divided by interdental septae that appear to extend from the groove's labial margin. Medial view of the left mandible of Dromaeosaurus albertensis (AMNH FR 5356) (D). Note the similar height of the labial and lingal margins of the dental groove that characterizes dromaeosaurs (Currie, 1987) among coelurosaurs and the apparent lack of a distinct textural difference between the proposed fused interdental plates and laminar bone of the dentary. Medial view of a partial right mandible of the tyrannosaurid Tarbosaurus baatar (IGM 100/1841) (E) showing the distinct difference between the labial and lingual margins of the dental groove and a distinct textural difference between the interdental plates and dentary bone.

Fig. 16 in The Perinate Skull of Byronosaurus (Troodontidae) with Observations on the Cranial Ontogeny of Paravian Theropods

Fig. 16. Lateral (A) and medial (B) views of an articulated prootic and exoccipital/opisthotic in a perinate Struthio camelus. Note the medial opening of the metotic fissure is divided—in contrast to the undivided metotic foramen of IGM 100/974.

Fig. 18 in The Perinate Skull of Byronosaurus (Troodontidae) with Observations on the Cranial Ontogeny of Paravian Theropods

Fig. 18. Parabasisphenoid of IGM 100/974 in left lateral (A, A9), right lateral (B, B9), and rostrodorsal

Fig. 15 in The Perinate Skull of Byronosaurus (Troodontidae) with Observations on the Cranial Ontogeny of Paravian Theropods

Fig. 15. Horizontal slice (A) through the braincase of the holotype of Byronosaurus jaffei (IGM 100/983) (B) showing the presence of pneumatic cavity in the base of the paroccipital process. The cavity is associated with a pair of rostral foramina and is inferred to result from invasion of the paroccipital process by diverticula of a posterior tympanic sinus residing in the posterior tympanic recess. The pneumatic cavity in the paroccipital process is largely infilled with a mineral inclusion that renders as a bright white in the figure. The white, horizontal line through the braincase (B) shows the position of the slice (A). Rostral is to the left, dorsal to the top.

Fig. 12 in The Perinate Skull of Byronosaurus (Troodontidae) with Observations on the Cranial Ontogeny of Paravian Theropods

Fig. 12. Left dorsolateral view of IGM 100/972. Note the broad lacrimal shelf and well-preserved left palatine.

Fig. 11 in The Perinate Skull of Byronosaurus (Troodontidae) with Observations on the Cranial Ontogeny of Paravian Theropods

Fig. 11. Right dorsolateral view of the caudal half of IGM 100/972 showing the right ectopterygoid and jugal, the caudal ends of both pterygoids, and the rostral end of the parasphenoid process of the parabasisphenoid.

Fig. 13 in The Perinate Skull of Byronosaurus (Troodontidae) with Observations on the Cranial Ontogeny of Paravian Theropods

Fig. 13. Left caudolateral view of the rostrum of IGM 100/972 showing the rostral walls of the antorbital fossa and maxillary antrum.

Fig. 5 in The Perinate Skull of Byronosaurus (Troodontidae) with Observations on the Cranial Ontogeny of Paravian Theropods

Fig. 5. Map of Mongolia showing the geographic position of Ukhaa Tolgod (Late Cretaceous, Djadoktha Formation).

Fig. 9 in The Perinate Skull of Byronosaurus (Troodontidae) with Observations on the Cranial Ontogeny of Paravian Theropods

Fig. 9. Lacrimal and surrounding region of IGM 100/972 (A, A9 right; B, B9 left) and IGM 100/974 (C, C9, right).

Fig. 1 in The Perinate Skull of Byronosaurus (Troodontidae) with Observations on the Cranial Ontogeny of Paravian Theropods

Fig. 1. Right (A, A9) and left lateral (B, B9) views of IGM 100/972, a Late Cretaceous perinate troodontid from Ukhaa Tolgod, Mongolia.

Fig. 34 in A Review of the Mongolian Cretaceous Dinosaur Saurornithoides (Troodontidae: Theropoda)

Fig. 34. Proximal end of right metatarsus with fused distal tarsal in Zanabazar junior (IGM 100/1) in posterior (A), anterior (B), dorsal (C), and medial (D) views.

Fig. 3 in The Perinate Skull of Byronosaurus (Troodontidae) with Observations on the Cranial Ontogeny of Paravian Theropods

Fig. 3. Right (A, A9) and left lateral (B, B9) views of IGM 100/974, a Late Cretaceous perinate troodontid from Ukhaa Tolgod, Mongolia. The partial braincase preserved with this specimen was removed and prepared separately.

Fig. 33 in A Review of the Mongolian Cretaceous Dinosaur Saurornithoides (Troodontidae: Theropoda)

Fig. 33. Distal end of the right tibia with coossified astragalus and calcaneum of Zanabazar junior (IGM 100/1) in lateral (A), medial (B), posterior (C), and anterior (D) views.

Fig. 30 in A Review of the Mongolian Cretaceous Dinosaur Saurornithoides (Troodontidae: Theropoda)

Fig. 30. Lateral view of closely appressed teeth in the left dentary of Zanabazar junior (IGM 100/1).

Fig. 29 in A Review of the Mongolian Cretaceous Dinosaur Saurornithoides (Troodontidae: Theropoda)

Fig. 29. The mandible of Zanabazar junior (IGM 100/1). A, above. Left mandible in dorsal, medial, and lateral views. B, opposite. Right mandible in dorsal, medial, and lateral views.

Fig. 31 in A Review of the Mongolian Cretaceous Dinosaur Saurornithoides (Troodontidae: Theropoda)

Fig. 31. The five preserved sacral vertebrae of Zanabazar junior (IGM 100/1) in dorsal (A) and ventral

Fig. 32 in A Review of the Mongolian Cretaceous Dinosaur Saurornithoides (Troodontidae: Theropoda)

Fig. 32. Series of five articulated distal caudal vertebrae of Zanabazar junior (IGM 100/1) in right lateral

Fig. 28 in A Review of the Mongolian Cretaceous Dinosaur Saurornithoides (Troodontidae: Theropoda)

Fig. 28. Continued. Isosurface rendering of the endocranial cast of Zanabazar junior (IGM 100/1) in anterior (E) and posterior (F) views.

Fig. 7 in The Perinate Skull of Byronosaurus (Troodontidae) with Observations on the Cranial Ontogeny of Paravian Theropods

Fig. 7. Left lateral views of the rostrum in IGM 100/972 (A) and IGM 100/974 (B) and a dorsolateral view of the right side of the rostrum in IGM 100/974 (C).

Fig. 27 in A Review of the Mongolian Cretaceous Dinosaur Saurornithoides (Troodontidae: Theropoda)

Fig. 27. Posteroventral view of the left lateral depression of the braincase in Zanabazar junior (IGM 100/1). Anterior is to the top of the page.