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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.
Fig. 57 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 57. Manual phalanx III:1 of (A) Sterna maxima and (B) Crypturellus undulatus compared to that of Ichthyornis dispar (C) as reconstructed by Marsh (1880) and (D) as preserved in YPM 1775. The distal ends of the phalanges in D (YPM 1775) are missing. The flexor process of III:1 (B, D) is prominent in Ichthyornis dispar (contra Marsh, 1880) and in Crypturellus undulatus.
Fig. 49 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 49. The left humerus of the Ichthyornis dispar holotype (YPM 1450) in (A) anterior and (B) posterior views.
Fig. 59 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 59. The tibiotarsus of Ichthyornis dispar (YPM 1450, YPM 1732) and Iaceornis marshi (YPM 1734): (A) the proximal left tibiotarsus of the Ichthyornis dispar holotype (YPM 1450) in anterior, posterior, and proximal views (left to right); (B) the distal right tibiotarsus of the Ichthyornis dispar holotype (YPM 1450) in anterior view; (C) the distal left tibiotarsus of a specimen referred to Ichthyornis dispar (YPM 1732) in anterior view; (D) the distal right tibiotarsus of the Iaceornis marshi holotype specimen (YPM 1734) in anterior view.
Fig. 39 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 39. The pneumatization of postzygapophyses of a posterior cervical vertebra in (A) Ichthyornis dispar (YPM 1733; ''tenth'' cervical of Marsh, 1880), (B) Crypturellus noctivagus (14th cervical vertebra), and (C) Sterna maxima (10th cervical vertebra).
Fig. 42 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 42. The sacrum and pelvic bones of Ichthyornis dispar (YPM 1732) in dorsal view (A) as included in the ''Ichthyornis victor'' panel mount and (B) removed from the mount; in ventral view (C) as depicted in Marsh (1880) and (D) after their removal from the mount and further preparation. In ''A'' the thoracic and caudal vertebrae as well as the femur also belong to specimen YPM 1732.
Fig. 52 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 52. The ulna of Ichthyornis dispar: (A) the right ulna of the Ichthyornis dispar holotype (YPM 1450), (B) the right ulna of the Ichthyornis validus holotype (YPM 1740), and (C) the left ulna of YPM 1453 (which was incorporated into the ''Ichthyornis victor'' panel mount) in ventral view.
Fig. 50 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 50. The right humerus of the Ichthyornis dispar holotype (YPM 1450): proximal end in (A) anterior and (B) posterior views and distal end in (C) anterior and (D) posterior views.
Fig. 37 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 37. The third cervical vertebra of (A) Ichthyornis dispar (YPM 1733), (B) Crypturellus noctivagus, and (C) Sterna maxima in posterior view.
Fig. 15 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 15. The pelvic bones of a specimen previously referred to Apatornis celer (YPM 1734; the Iaceornis marshi holotype) as originally illustrated in right lateral view (Marsh, 1880: pl. XXXII). These elements are missing and could not be examined. Anatomical abbreviations original to Marsh (1880; a: Ischiosciatic interval, b: obturator interval, af: acetabular foramen, il: ilium, is: ischium, pb: pubis). Figure not to scale.
Fig. 16 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 16. The holotype specimen of Iaceornis marshi (YPM 1734) is comprised of a partial postcranium: (A) left coracoid in (left) dorsal and (right) ventral views, (B) sternum in ventral view, (C) proximal and distal ends of left femur in (left) posterior and (right) anterior views, (D) left scapula in (left) dorsal and (right) ventral views, (E) right tibiotarsus in (left) anterior and (right) posterior views, (F) right carpometacarpus, manual phalanges II:1 and II:2 in (left) dorsal and (right) ventral views, (G) left radius in (left) dorsal and (right) ventral views; (H)left omal tip of furcula; (I) left ulnare in (left) anterior and (right) posterior views; and (J) left radiale in (left) dorsal and (right) ventral views.
Fig. 14 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 14. The Apatornis celer holotype (a sacrum; YPM 1451) in (A) dorsal and (B) right lateral views. The sacral series is proximally incomplete.
Fig. 12 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 12. The Ichthyornis validus holotype (YPM 1740), a right ulna: (A) the distal end in dorsal view and (B) the complete element in ventral view.
Fig. 3 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 3. YPM preparator Hugh Gibb's notes on the specimens included in the ''Ichthyornis victor'' panel mount. Three of the specimen numbers given here are incorrect, namely those for the carpometacarpus, tarsometatarsus, and manual phalanx II:2.
Fig. 11 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 11. The Ichthyornis victor holotype (YPM 1452), which includes (A) two fragments of the left humerus (anterior view), (B) the left proximal scapula (dorsal view), and (C) the left proximal coracoid in medial view.
Fig. 9 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 9. Distance from the proximal end of the Ichthyornis dispar ulna (YPM 1450, YPM 1453, YPM 1740, YPM 1757) to the nutrient foramen (in millimeters).
Fig. 1 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 1. The Ichthyornis dispar panel mount in 1997, which contained the only holotype of that taxon, YPM 1450.
Fig. 2 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)
Fig. 2. The ''Ichthyornis victor'' panel mount in 1997, which contained none of the Ichthyornis victor holotype.
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