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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. 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. 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. 8 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 8. Multi-rayed star-like spicules of colonial tunicates Didemnum sp. in food pellets of Thysanozoon nigropapillosum (Hyman, 1959).

Fig. 6 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 6. Longitudinal section of Thysanozoon nigropapillosum (Hyman, 1959). A, pharynx and main intestine; B, food pellet remains inside the main intestine. fp, food pellet; mi, main intestine; ph, pharynx.

Fig. 9 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 9. Thysanozoon nigropapillosum (Hyman, 1959): copulation observed at Longdong bay, northeast coast of Taiwan, 25 July 2011. A, Dermal impregnation for unilateral insemination; B, One individual (right), with the paired penis stretched, gripping its partner (left) at the outermost margin. (spermatophore is indicated by an arrow)

Fig. 7 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 7. Thysanozoon nigropapillosum (Hyman, 1959) A, with colonial tunicates (indicated by arrows), found at Longdong Bay, Northeast Coast of Taiwan, 28 August 2008; B, regurgitated food pellet (indicated by arrowhead). Chuanfanshr, Kenting, southern Taiwan, 9 February 2006.

Fig. 4 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 4. Thysanozoon nigropapillosum (Hyman, 1959): rhabdites on epidermis (indicated by arrows). A, B, on the tips of papillae; C, distributed on the inner surface of the male atrium; D, distributed on the female pore.

Fig. 5 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 5. Distribution of Thysanozoon nigropapillosum (Hyman, 1959) A, around Taiwan; B, type locality (hollow square), and the probably distribution of Newman et al. (2003) collection (filled triangles), the distribution of Gosliner et al. (1996) collection (filled circles) in Indo-west Pacific.

Fig. 3 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 3. Diagrammatic representation of the reproductive anatomy of Thysanozoon nigropapillosum (Hyman, 1959). A, male. e, ejaculatory duct; in, intestine; ma, male pore; pr, prostate gland; se, seminal vesicle; sp, sperm; st, stylet; v, vas deferens. B, female. c, cement gland; f, female pore; mi, main intestine; p, pharynx; v, vagina.

Fig. 2 in Re-description of Thysanozoon nigropapillosum (Polycladida: Pseudocerotidae) from the South China Sea, with observations on a novel pre-copulatory structure, sexual behaviour and diet

Fig. 2. Thysanozoon nigropapillosum (Hyman, 1959). Anterior is to the right. A, dorsal view; B, ventral view. ce, cerebral eyespots; fp, female pore; m, mouth; mp, male pore; ph, pharynx; pt, pseudotentacle; s, sucker.