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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.

Fig. 8 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)

Fig. 8. Total ulnar length (in millimeters) compared for the only complete YPM Ichthyornis dispar ulnae (YPM 1450, YPM 1453, YPM 1740).

Fig. 10 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)

Fig. 10. The (A) Ichthyornis anceps (YPM 1208) and (B) Ichthyornis agilis (YPM 1209) holotype specimens in dorsal (right) and ventral (left) views. YPM 1208 and YPM 1209 are partial distal and proximal carpometacarpi, respectively.

Fig. 4 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)

Fig. 4. Apomorphies of Ichthyornis dispar. Numbers 1–9 correspond to the characters used in the diagnosis and are indicated for the following specimens: (1) YPM 1775, left quadrate, anterior view; (2) YPM 1733, a posterior cervical vertebrae, posteroventral view; (3) YPM 1732 caudal vertebrae, dorsal view; (4) YPM 1718, right scapula, dorsal view; (5) YPM 1450, left humerus, posterior view;

Fig. 5 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)

Fig. 5. Distal humeral dimensions (in millimeters) of four uncrushed YPM Ichthyornis dispar specimens (YPM 1450, YPM 1464, YPM 1738, YPM 9685).

Fig. 6 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)

Fig. 6. Size and stratigraphic position of individuals referred to Ichthyornis dispar interpreted as anagenetic change. Data points represent total humerus length of the indicated specimen(s) in millimeters. The relative size of specimens without data points, those lacking complete humeri, was estimated (i.e., YPM 1738, 1765, SMM 2139, USNM 22820, TMM 42522–1, and Cenomanian specimens, SMNH P2077.67, SMNH P2077.111, SMNH P2077.112, SMNH P2487.5). Shaded regions indicate size variation for each time period interpreted as anagenetic change in a single lineage.

Fig. 61 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)

Fig. 61. The number of exemplars of anatomical elements in the YPM Ichthyornis dispar material.

Fig. 54 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)

Fig. 54. The right ulnare of Ichthyornis dispar (SMM 2503) in (A) anterior and (B) ventral views.

Fig. 48 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)

Fig. 48. The left scapula of Ichthyornis dispar (YPM 1773) in dorsolateral view.

Fig. 45 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)

Fig. 45. The sternum of Ichthyornis dispar (continued).

Fig. 28 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)

Fig. 28. The posterior portion of the mandible

Fig. 25 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)

Fig. 25. The braincase of the Ichthyornis dispar holotype (YPM 1450) in right lateral view.