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Fig. 10 in A Small Derived Theropod from Öösh, Early Cretaceous, Baykhangor Mongolia

Fig. 10. Systematic variation in antorbital fossa morphology among coelurosaur theropods. Velociraptor mongoliensis (AMNH FR 6515), top, illustrating a dorsal border of the antorbital fossa formed by the lacrimal and maxilla (character 243.0). Archaeopteryx lithographica (WDC-CSG-100), middle, illustrating a dorsal border of the antorbital fossa formed by the lacrimal and nasal (character 243.1). From Mayr et al. (2005). Reprinted with permission from AAAS. Citipati osmolskae (IGM 100/978), bottom, illustrating a dorsal border of the antorbital fossa formed by the maxilla, premaxilla, and lacrimal (character 243.2). Images not to scale.

Fig. 3 in A Small Derived Theropod from Öösh, Early Cretaceous, Baykhangor Mongolia

Fig. 3. Detail of posterior tooth morphology in IGM 100/1119. Note serrations on posterior carinae and unconstricted root-crown transition.

Fig. 17 in A Small Derived Theropod from Öösh, Early Cretaceous, Baykhangor Mongolia

Fig. 17. Systematic variation in first premaxillary tooth size among coelurosaur theropods. Tsaagan mangas (IGM 100/1015), top, illustrating a first premaxillary tooth similar in size to premaxillary teeth 2 and 3 (character 251.0). Velociraptor mongoliensis (IGM 100/982), middle, illustrating a first premaxillary tooth much smaller than premaxillary teeth 2 and 3 (character 251.1). Incisivosaurus gauthieri (IVPP V13326), bottom, illustrating a first premaxillary tooth much larger than premaxillary teeth 2 and 3 (character 251.2). Images not to scale.

Fig. 1 in A Small Derived Theropod from Öösh, Early Cretaceous, Baykhangor Mongolia

Fig. 1. Map of Mongolia showing geographical relationship of the Öösh locality to other Gobi fossil localities.

Fig. 5 in A Small Derived Theropod from Öösh, Early Cretaceous, Baykhangor Mongolia

Fig. 5. Phylogenetic placement of IGM 100/1119. A. Strict consensus of 552 most parsimonious reconstructions of coelurosaurian interrelationships found in our phylogenetic analysis of 251 characters and 56 coelurosaurian taxa. The new taxon is indicated in bold. B. Adams consensus topology of nonunenlagiine dromaeosaurids recovered in from this analysis.

Fig. 4 in A Small Derived Theropod from Öösh, Early Cretaceous, Baykhangor Mongolia

Fig. 4. Detail of the tooth morphology and size variation seen in the dentary of IGM 100/1119. Anatomical labels in appendix 3.

Fig. 12 in A Small Derived Theropod from Öösh, Early Cretaceous, Baykhangor Mongolia

Fig. 12. Systematic variation in supratemporal fossa morphology among theropod dinosaurs. Mei long (IVPP V12733), top, illustrating a supratemporal fossa with limited extension onto the dorsal surface of the frontal and postorbital (character 245.0). Tyrannosaurus rex (FMNH PR2081), bottom, illustrating a supratemporal fossa with extensive covering of the frontal process of the postorbital and dorsal surface of the frontal (character 245.1). Images not to scale.

Fig. 11 in A Small Derived Theropod from Öösh, Early Cretaceous, Baykhangor Mongolia

Fig. 11. Systematic variation in maxilla morphology among paravian theropods. Velociraptor mongoliensis (AMNH FR 6515), top, illustrating a large, prominent lateral lamina of the ventral ramus of nasal process of maxilla (character 244.0). Shanag ashile (IGM 100/1119), bottom, illustrating a reduced, small triangular exposure of the lateral lamina of the ventral ramus of nasal process of maxilla (character 244.1). Images not to scale.

Fig. 9 in A Small Derived Theropod from Öösh, Early Cretaceous, Baykhangor Mongolia

Fig. 9. Systematic variation in internal antorbital fenestra morphology among paravian theropods. Archaeopteryx lithographica (WDC-CSG-100), top, illustrating a dorsal border of the internal antorbital fenestra formed by the lacrimal and maxilla (character 242.0). From Mayr et al. (2005). Reprinted with permission from AAAS. Confuciusornis sanctus (GMV 2131), bottom, illustrating a dorsal border of the internal antorbital fenestra formed by the lacrimal and/or nasal (character 242.1). Images not to scale.

Fig. 16 in A Small Derived Theropod from Öösh, Early Cretaceous, Baykhangor Mongolia

Fig. 16. Systematic variation in splenial morphology among theropod dinosaurs. Citipati osmolskae (IGM 100/978), top, illustrating a splenial that does not form a notched anterior margin of the internal mandibular fenestra (character 250.0). Tyrannosaurus rex (FMNH PR2081), bottom, illustrating a splenial that forms a notch anterior margin to the internal mandibular fenestra (character 250.1). Images not to scale.

Fig. 15 in A Small Derived Theropod from Öösh, Early Cretaceous, Baykhangor Mongolia

Fig. 15. Systematic variation in maxillary tooth orientation and height in deinonychosaurian theropods. Saurornithoides mongoliensis (AMNH FR 6516), middle, illustrating maxillary teeth perpendicular to the jaw margin (character 248.0) and isodont teeth with no replacement gaps (character 249.1). Bambiraptor feinbergorum (AMNH FR 30554), bottom, illustrating maxillary teeth strongly inclined posteroventrally (character 248.1). Velociraptor mongoliensis (AMNH FR 6515), top, illustrating maxillary teeth with variable height and tooth replacement gaps (character 249.0). Images not to scale.

Fig. 8 in A Small Derived Theropod from Öösh, Early Cretaceous, Baykhangor Mongolia

Fig. 8. Systematic variation in antorbital fenestra morphology among paravian theropods. Diomedea epomophora (AMNH 5311), top, illustrating a reduced dorsal ramus of the nasal process of maxilla (character 240.1) and a ventral ramus of the maxilla with no dorsal projection participating in the anterior margin of the antorbital fenestra (character 241.2). Velociraptor mongoliensis (AMNH FR 6515), bottom, illustrating a prominent dorsal ramus of the nasal process of maxilla that is exposed medially and laterally (character 240.0) and extensive participation of the ventral ramus of the nasal process of the maxilla in the anterior margin of the antorbital fenestra (character 241.0). Images not to scale.

Fig. 14 in A Small Derived Theropod from Öösh, Early Cretaceous, Baykhangor Mongolia

Fig. 14. Systematic variation in tooth denticle size among theropod dinosaurs. Dromaeosaurus albertensis (AMNH FR 5356), top, illustrating anterior and posterior denticles not significantly different in size (character 247.0). Velociraptor mongoliensis (IGM 100/1252), bottom, illustrating anterior denticles that are significantly smaller than posterior denticles (character 247.1). Images not to scale.

Fig. 22 in A New Dromaeosaurid Theropod from Ukhaa Tolgod (Ömnögov, Mongolia)

Fig. 22. Phylogenetic placement of Tsaagan mangas. A, strict consensus of 144 most parsimonious reconstructions of coelurosaurian interrelationships found in our phylogenetic analysis of 236 characters and 57 coelurosaurian taxa. Tsaagan mangas is indicated in boldface. The most parsimonious trees (length 5 710, CI 5 0.401, RI 5 0.728) were found in 693 of the 1000 replicates of TBR followed by an additional round of TBR on the retained MPTs. B, detail of dromaeosaurid topology in the Adams consensus of same tree set.

Fig. 23 in A New Dromaeosaurid Theropod from Ukhaa Tolgod (Ömnögov, Mongolia)

Fig. 23. The phylogenetic result of incorporating Tsaagan mangas into the revised dataset of Currie and Varrichio (2004). A strict consensus shows the results of a branch-and-bound search conducted in PAUP* (v. 4.0b10). Two most parsimonious trees of length 64 (CI 5 0.7344, RI 5 0.7733) were found. See the text for tree shape details.

Fig. 24 in A New Dromaeosaurid Theropod from Ukhaa Tolgod (Ömnögov, Mongolia)

Fig. 24. The phylogenetic result of incorporating Tsaagan mangas into the dataset of Senter et al. (2004). A strict consensus shows the results of a heuristic search conducted in PAUP* (v. 4.0b10). One thousand replicates of random sequence addition followed by TBR branch swapping recovered 189 most parsimonious trees of length 230 (CI 5 0.4826, RI 5 0.7927). See the text for tree shape details.

Fig. 19 in A New Dromaeosaurid Theropod from Ukhaa Tolgod (Ömnögov, Mongolia)

Fig. 19. Fourth cervical vertebra of the holotype of Tsaagan mangas (IGM 100/1015) in posterior (A), right lateral (B), and dorsal (C) views. Abbreviations are in appendix 1.

Fig. 16. Right maxillary tooth positions 6–8 and dentary tooth positions 9–11 in A New Dromaeosaurid Theropod from Ukhaa Tolgod (Ömnögov, Mongolia)

Fig. 16. Right maxillary tooth positions 6–8 and dentary tooth positions 9–11 of the holotype of Tsaagan mangas (IGM 100/1015). These teeth show the enlarged posterior denticles characteristic of dromaeosaurids.

Fig. 15 in A New Dromaeosaurid Theropod from Ukhaa Tolgod (Ömnögov, Mongolia)

Fig. 15. Right postdentary bones in (A) Tsaagan mangas (IGM 100/1015), (B) an undescribed dromaeosaur from Khulson (IGM 100/981), and (C) Dromaeosaurus albertensis (AMNH FR 5356). Note the well-defined longitudinal trough on the dorsal surface of the surangular. Abbreviations are in appendix 1.

Fig. 21 in A New Dromaeosaurid Theropod from Ukhaa Tolgod (Ömnögov, Mongolia)

Fig. 21. Left scapulocoracoid of the holotype of Tsaagan mangas (IGM 100/1015) in lateral (A) and medial (B) views. Abbreviations are in appendix 1.