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Fig. 51 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 51. Comparison of size and morphology of Ichthyornis dispar humeri: (top: distal humeri in anterior view; bottom: proximal humeri in posterior view): (A) YPM 1738, (B) YPM 1450, (C) YPM 1764, (D) YPM 1733, (E) YPM 1452, (F) YPM 1742. These specimens were previously identified as parts of three distinct species (see table 1) but are here referred to Ichthyornis dispar. The range in the height of the dorsal supracondylar process (top) and the size of the humeral head (bottom) appears to be continuous (see arrows).
Fig. 58 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 58. The left femur of the (A) Ichthyornis dispar holotype (YPM 1450; right: anterior view, left: posterior view) and (B) Iaceornis marshi (YPM 1734; posterior view).
Fig. 60 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 60. The tarsometatarsus of Ichthyornis dispar (YPM 1739): (A, B, D) proximal and (C) distal ends in (A, C) anterior, (B) plantar, and (D) dorsal views.
Fig. 47 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 47. The coracoid of Ichthyornis dispar: (A) distal left coracoid of the Ichthyornis dispar holotype (YPM 1450) in (top) ventral and (bottom) dorsal views; (B) right coracoid, YPM 1733, in dorsal view; and (C) proximal left coracoid, YPM 1446, referred to ''Ichthyornis validus'' in Marsh (1880) in (left) dorsal and (right) medial views.
Fig. 46 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 46. Two fragments of the furcula of Ichthyornis dispar: (A) right(?) ramus in medial view including omal tip (SMM 2503) and (B) juncture of fused clavicles in posterior view (YPM 1755).
Fig. 45 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 45. The sternum of Ichthyornis dispar. The holotype specimen (YPM 1450) sternum in (A) dorsal view and (B) as represented by Marsh (1880) as well as two steri from referred specimens (C) YPM 1461 and (D) BMNH A905 in left lateral view. The location of a large midline pneumatic foramen shown in ''A'' is indicated with an arrow in ''B''.
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.
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