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Fig. 41 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 41. The sacrum of the Ichthyornis dispar holotype (YPM 1450) in (A) dorsal and (C) ventral views. The number of midseries sacrals with diminutive and dorsally projected transverse processes in (A) Ichthyornis dispar and (B) Apatornis celer (YPM 1451) are indicated.
Fig. 38. A in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 38. A posterior cervical vertebra (''tenth'' cervical of Marsh, 1880) of Ichthyornis dispar (YPM
Fig. 36 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 36. The third cervical vertebra of (A) Ichthyornis dispar (YPM 1733), (B) Crypturellus noctivagus, and (C) Sterna maxima in ventral view.
Fig. 55 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 55. The right carpometacarpus of (A, B) Ichthyornis dispar (YPM 1724) and (C) Iaceornis marshi (YPM 1734) in (A) dorsal and (B, C) ventral views.
Fig. 34 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 34. The third cervical vertebra of Ichthyornis dispar (YPM 1733) in (A) anterior, (B) posterior, and (C) ventral views.
Fig. 33 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 33. The atlas and axis of Ichthyornis dispar: (A) the axis of YPM 1775 in (clockwise from top left) ventral, lateral, and posterior views and (B) the atlas and axis of YPM 1733 in (clockwise from top left) dorsal, ventral, and posterior views.
Fig. 30 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 30. The posterior portion of the left mandible of the Ichthyornis dispar holotype (YPM 1450) in (A, B) oblique mediodorsal and (C) medial views.
Fig. 29 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 29. The posterior portion of the right mandible of the Ichthyornis dispar holotype (YPM 1450) in (A, B) medial (internal) view. The prearticular/suranglar suture appears distorted posterior to a prominent fracture (*).
Fig. 32 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 32. The anterior end of the mandible in Ichthyornis dispar (YPM 1775) in (A, C) medial (internal) and (B, D) lateral (external) views. The length of a representative alveolus is indicated.
Fig. 35 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 35. The third cervical vertebra of (A) Ichthyornis dispar (YPM 1733), (B) Crypturellus noctivagus, and (C) Sterna maxima in anterior view.
Fig. 26. A in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 26. A portion of the skull roof of Ichthyornis dispar (YPM 1728) in (A) dorsal and (B) ventral views.
Fig. 31 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 31. The teeth and alveoli of Ichthyornis dispar: (A) the right mandible of YPM 1735 in medial view with measurements of the length of alveoli in anterior (left) and posterior (right) parts of the jaw fragment; (B) a mid toothrow portion of the left mandible of YPM 1450 in medial (top) and lateral (bottom) views; (C) a developing tooth in the sixth alveolus from the posterior end of the dentary (YPM 1450; the tooth appears foreshortened as a result of the oblique dorsal view); (D) the posterior portion of the tooth row in YPM 1749 with the length of a representative alveolus.
Fig. 27 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 27. The left (A–E) and right (F–H) quadrates of Ichthyornis dispar (YPM 1775) in (A, G) anterior, (B, H) lateral, (C, F) medial, (D) dorsal, and (E) ventral views.
Fig. 24 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 24. The skull of the Ichthyornis dispar holotype (YPM 1450) in (A) right and (B) left lateral views.
Fig. 22 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 22. The braincase of Ichthyornis dispar (YPM 1728) in posterior view. This part of YPM 1728 was placed in the ''Ichthyornis victor'' panel mount.
Fig. 43 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 43. The caudal vertebrae of Ichthyornis dispar (YPM 1732): (A) the third free caudal in dorsal view and the (B) incompletely preserved fused, distal caudals (pygostyle) in right lateral view. In A, the morphology of elongate prezygapophyses, and the absence of projected postzygapophyses (developed as facets) are indicated.
Fig. 19 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 19. Reconstructions of the skull and man dible of Ichthyornis: (A) Cranial material incorpo rated into the ''Ichthyornis victor'' panel mount, (B) the reconstructions of the mandible of Ichthy ornis by Marsh (1880), (C) by Gregory (1952).
Fig. 18 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 18. Maxillary fragment from the Ichthyornis dispar holotype specimen (YPM 1450) in (A) ventrolateral view and in (B) mediodorsal view. Illustrations of the maxilla in Marsh (1880) are mirror images of the element.
Fig. 40 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 40. Presacral vertebrae of Ichthyornis dispar. Two posterior cervical vertebrae from the holotype specimen (YPM 1450) referred to in the text as (A) 1450A and (B) 1450B are shown in right lateral and anterior views, respectively. An anterior thoracic from YPM 1450 (C) referred to as 1450C and (D) the posteriormost thoracic of YPM 1732 (1732C) are also shown in right lateral view. The identification of 1732C identification as the last presacral is based on notes (Marsh, 1880) indicating that it was discovered in articulation with the sacrum.
Fig. 17 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 17. The holotype specimen of Ichthyornis (Austinornis) lentus (YPM 1796; a right distal tarsometatarsus) in (A) dorsal and (B) plantar views. The asymmetrical development of the trochlea of metatarsal III is indicated.
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