Fig 1.
(A) CT model of Holotype, UO F-26799, skull in right lateral view with a stylized drawing of the originally proposed “sabertoothed” position of the isolated premaxilla; (B) UO_A in anterior view of skull, prior to complete preparation and CT scan; (C) Artist’s rendering skull of male iconic fish with accurate spike-tooth configuration; (D) Artist’s rendering of complete female iconic fish with accurate spike-tooth configuration. Scale bar blocks = 1 cm each.
Fig 2.
†Oncorhynchus rastrosus female skull, UO F-55101, specimen A.
(A) in left lateral view with (B) line drawings overlain; (C) in right lateral view with (D) line drawings overlain. Scale bar = 5 cm. Full page, turned landscape.
Fig 3.
†Oncorhynchus rastrosus skull, male, UO F-55101, specimen B.
(A) in left lateral view with (B) line drawings overlain; (C) in right lateral view with (D) line drawings overlain. Scale bar = 5 cm. Full page, turned landscape.
Fig 4.
†Oncorhynchus rastrosus skulls in dorsal view.
(A) UO F-55101, specimen B = male with (B) line drawings overlain; (C) UO F-55101, specimen A = female with (D) line drawings overlain; (E) CT rendering of Holotype UO F-26799 = male with (F) line drawings overlain. Anterior to top of page. Scale bar = 5 cm. Full page, portrait.
Fig 5.
Segmented skull of †Oncorhynchus rastrosus, UO F-55101, specimen A.
(A) left lateral view; (B) left dorso-lateral oblique view; (C) dorsal view; (D) ventral view; (E) isolated parasphenoid and prootic bones in ventral view. Anterior to left of page. Scale bar = 5 cm. Full page, turned landscape.
Fig 6.
Pharyngeal skeleton of †Oncorhynchus rastrosus, UO F-55101, specimen A.
(A) Proximal parasagittal cross section through dentary and hypertrophied premaxilla; (B) Distal parasagittal cross section through dentary and premaxillary spike; (C-F) right dentary in (C) anterior, (D) lateral, (E) lingual, and (F) dorsal views;(G) CT reconstruction of branchial basket; (H) dorsal view of posteroventral hyals; (I) line drawing of posteroventral hyals. A-C, anterior to left of page; D, anterior to top of page. Full width of page, portrait.
Fig 7.
†Oncorhynchus rastrosus UO F-55101, specimen C.
Pectoral skeleton and opercular series in left lateroventral view. Anterior to top of page. Scale bar = 5 cm. Full width of page, portrait.
Fig 8.
CT renderings of anterior axial skeleton of †Oncorhynchus rastrosus.
(A) Posterior view of cranium of holotype UO F-26799; (B-J) UO F-55101, specimen C. (B) Posterior view of proatlas; (C) Dorsal view of proatlas; (D) Ventral view of proatlas; (E) Anterior view of first free centrum; (F) Posterior view of first free centrum; (G) Dorsal view of first free centrum; (H) Ventral view of first free centrum; (I) Left lateral view of cranio-vertebral articulation and anterior abdominal axial skeleton; (J) Right lateral view of cranio-vertebral articulation and anterior abdominal axial skeleton. Full page, portrait.
Fig 9.
Posterior abdominal series of †Oncorhynchus rastrosus, UO F-55101, specimen D.
(A) Left lateral view of articulated vertebrae; (B) digital axial cross section from dashed line, B; (C) digital median-sagittal cross section in box, C. full width of page, portrait.
Fig 10.
Phylogenetic hypotheses of Salmonidae.
(A) parsimony hypothesis of all OTUs; (B) Bayesian hypothesis of salmonid genera; (C) expanded relationships of extant and extinct species of Oncorhynchus. Full page, portrait.
Fig 11.
Character optimization on the present study’s morphological hypothesis, juxtaposed with the prevailing molecular hypothesis.
Molecular tree modified from Crête-Lafrenière et al. (2012), Horreo (2017), and Colín et al. (2023). Bold-italicized taxa appear twice on the figure and once on each tree. Unambiguous character transformations for labeled branches where bold text means CI = 1.0: A = 49:0>1; B = 67:1>0, 91:1>0; C = 70:0>1; D = 81:2>1; E = 72:2>1, 107:0>1; F = 17:0>1, 101:0>1, 106:0>1; G = 98:0>1; H = 8:0>1, 36:1>0, 51:2>1, 59:0>1, 87:0>1; I = 28:0>1; J = 7:1>2; K = 22:0>1; L = 1:0>1, 93:1>2, 105:1>2, 114:1>0; M = 98:0>1, 118:0>1; N = 76:0>1, 113:0>1. Full width of page, portrait.
Table 1.
Sexually dimorphic character suites by specimen.