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9 results for “Jeholornithiformes”
Figure 9 in Cranial osteology and palaeobiology of the Early Cretaceous bird Jeholornis prima (Aves: Jeholornithiformes)
Figure 9. Scleral ring measurements of Jeholornis STM 3-8. Reassembled three-dimensional cranial model of Jeholornis STM 3-8 used for measurements, following Hu et al. (2022). Scale bar: 5 mm. Abbreviations: EXT, scleral ring outer diameter; INT, scleral ring inner diameter; OL, orbital length.
Figure 8 in Cranial osteology and palaeobiology of the Early Cretaceous bird Jeholornis prima (Aves: Jeholornithiformes)
Figure 8. Three-dimensional snapshots of mandibular elements of Jeholornis STM 3-8: lateral (A) and medial (B) views of the left mandible; lateral (C), medial (D) and dorsal (E) views of the left dentary; medial view of the left dentary with maxillary teeth (F); lateral (G), medial (H) and dorsal (I) views of the left surangular; lateral (J) and medial (K) views of the right splenial; lateral (L) and medial (M) views of the angular. Scale bar: 5 mm. Arrows indicate the rostral direction. Abbreviations: cnp, coronoid process; dt, dentary teeth; lct, lateral condyle; mct, medial condyle; mf, mandibular fenestra; mfs, mandibular fossa; mp, medial process; mt, maxillary teeth; pra, prearticular; rcd, rostral concavity of dentary; rt, replacement tooth; rtp, retroarticular process.
Figure 7 in Cranial osteology and palaeobiology of the Early Cretaceous bird Jeholornis prima (Aves: Jeholornithiformes)
Figure 7. Photograph and reidentified cranial elements of Jeholornis palmapenis. Scale bar: 5 mm. Revised from O'Connor et al. (2012). Abbreviations: pt, palatine; qj, quadratojugal.
Figure 6 in Cranial osteology and palaeobiology of the Early Cretaceous bird Jeholornis prima (Aves: Jeholornithiformes)
Figure 6. Comparisons of postorbital and palatal complex in Aves. Taxa without the postorbital present indicate that this element has been entirely reduced and fused to the frontal to be the postorbital process in these taxa. Dashed lines indicate uncertain structures. Scale bar: 5 mm only for the postorbitals.
Figure 5 in Cranial osteology and palaeobiology of the Early Cretaceous bird Jeholornis prima (Aves: Jeholornithiformes)
Figure 5. Three-dimensional snapshots of the palatal elements and scleral ring of Jeholornis STM 3-8: ventral (A) and dorsal (B) views of the vomer; medial (C) and lateral (D) views of the right pterygoid; ventral (E) and dorsal (F) views of the right palatine; left view of the scleral ring (G) and the scleral bone (H). Scale bar: 5 mm. Arrows indicate the rostral direction. Labels for articular facets are in red. Abbreviations: a.m, maxilla articulation; a.pa, palatine articulation; a.psr, parasphenoid rostrum articulation; a.pt, pterygoid articulation; a.v, vomer articulation; cp, choanal process; mpa, maxillary process of palatine; op, overplate; par, palatine ramus of pterygoid; pgw, pterygoid wing; pj, jugal process of palatine; pmr, premaxillary ramus of vomer; ptr, pterygoid ramus of vomer; qur, quadrate ramus of pterygoid.
Figure 4 in Cranial osteology and palaeobiology of the Early Cretaceous bird Jeholornis prima (Aves: Jeholornithiformes)
Figure 4. Three-dimensional snapshots of the quadrate and skull roof of Jeholornis STM 3-8: lateral (A), medial (B) and caudal (C) views of the right quadrate; dorsal (D) and ventral (E) views of the frontals; dorsal (F), ventral (G) and caudal (H) views of the braincase. Scale bar: 5 mm. Arrows indicate the rostral direction. Labels for articular facets are in red. Dashed lines indicate broken margins. Abbreviations: a.n, nasal articulation; a.pa, parietal articulation; bsr, basisphenoid recess; cup, cultriform process; lc, lateral condyle of quadrate; mc, medial condyle of quadrate; nc, nuchal crest; oc, occipital condyle; op, orbital process of quadrate; om, obital margin; otp, otic process of quadrate; prp, paroccipital process; sr, supraorbital rim; stf, supratemporal fossa. Labels of neurocranial elements are not abbreviated.
Figure 3 in Cranial osteology and palaeobiology of the Early Cretaceous bird Jeholornis prima (Aves: Jeholornithiformes)
Figure 3. Three-dimensional snapshots of lateral and dorsal cranial elements of Jeholornis STM 3-8: dorsal lateral (A) and ventromedial (B) views of the left nasal; dorsal views of the right (C) and left (D) preorbital ossification; lateral (E) and medial (F) views of the left quadratojugal; lateral (G) and medial (H) views of the left jugal; lateral (I), laterocaudal (J) and medial (K) views of the left postorbital; lateral (L) and medial (M) views of the right squamosal. Scale bar: 5 mm. Arrows indicate the rostral direction. Labels for articular facets are in red. Dashed lines indicate broken margins. Abbreviations: a.m, maxilla articulation; a.po, postorbital articulation; a.q, quadrate articulation; a.qj, quadratojugal articulation; a.s, squamosal articulation; fpo, frontal process of postorbital; jpo, jugal process of postorbital; jpq, jugal process of quadratojugal; mpj, maxillary process of jugal; mpn, maxillary process of nasal; ocj, oval concavity of jugal; poj, postorbital process of jugal; pos, postorbital process of squamosal; ppn, premaxillary process of nasal; qjp, quadratojugal process of jugal; qjs, quadratojugal process of squamosal; spo, squamosal process of postorbital; spq, squamosal process of quadratojugal.
Figure 2 in Cranial osteology and palaeobiology of the Early Cretaceous bird Jeholornis prima (Aves: Jeholornithiformes)
Figure 2. Three-dimensional snapshots of rostral cranial elements of Jeholornis STM 3-8: lateral (A) and medial (B) views of the articulated left premaxilla, maxilla and lacrimal; lateral view (C), lateral line drawing (D), dorsal view (E) and ventral view (F) of the fused premaxillae; lateral (G), caudolateral (H) and medial (I) views of the right lacrimal; lateral view (J), lateral line drawing (K) and medial view (L) of the left maxilla. Scale bar: 5 mm. Arrows indicate the rostral direction. Labels for articular facets are in red. Abbreviations: a.j, jugal articulation; a.l, lacrimal articulation; a.m, maxilla articulation; a.n, nasal articulation; aof, antorbital fenestra; a.p, premaxilla articulation; a.pt, palatine articulation; apm, ascending process of maxilla; cdr; caudodorsal ramus of lacrimal; fpp, frontal process of premaxilla; jpm, jugal process of maxilla; ld, lateral depression of maxilla to receive the maxillary process of premaxilla; lf, lacrimal foramen; mf?, potential maxillary fenestra; mpp, maxillary process of premaxilla; mt, maxillary teeth; nf, nutrient foramina; pam, palatal process of maxilla; ppm, premaxillary process of maxilla; ppp, palatal process of premaxilla; rdr, rostrodorsal ramus of lacrimal; vr, ventral ramus of lacrimal.
Figure 1 in Cranial osteology and palaeobiology of the Early Cretaceous bird Jeholornis prima (Aves: Jeholornithiformes)
Figure 1. Photograph (A), left view of the three-dimensionally reconstructed skull (B) and lateral (C) and ventral (D) views of the two-dimensional cranial reconstruction of Jeholornis STM 3-8 (following Hu et al., 2022). Scale bars: 5 mm. Abbreviations: an, angular; br, braincase; de, dentary; ep, ectopterygoid; fr, frontal; ju, jugal; la, lacrimal; ma, maxilla; na, nasal; pa, palatine; pre, premaxilla; po, postorbital; pro, preorbital ossification; pt, pterygoid; qj, quadratojugal; qu, quadrate; sp, splenial; sq, squamosal; sr, scleral ring; su, suangular; v, vomer. Dashed lines indicate the elements not preserved but suspected to exist.
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