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97 results for “Archosauriformes”
Figure 1 in The osteology and relationships of Vancleavea campi (Reptilia: Archosauriformes)
Figure 1. The crushed, twisted skeleton of Vancleavea campi (GR 138). The dark line traces the dorsal margin. The grey colour indicates the left side of the skeleton, and the white areas indicate the right side. The left forelimb has been flipped over from the left side to the right side.
Figure 2 in The osteology and relationships of Vancleavea campi (Reptilia: Archosauriformes)
Figure 2. Right lateral view of the skull of Vancleavea campi (GR 138). Scale bar, 1 cm.
Figure 5 in The osteology and relationships of Vancleavea campi (Reptilia: Archosauriformes)
Figure 5. Dorsal view of the skull of Vancleavea campi (GR 138). Scale bar, 1 cm.
Figure 3 in The osteology and relationships of Vancleavea campi (Reptilia: Archosauriformes)
Figure 3. Left lateral view of the skull of Vancleavea campi (GR 138). Scale bar, 1 cm.
Data from: Endocranial anatomy and life habits of the Early Triassic archosauriform Proterosuchus fergusi
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Data from: The monophyly of Euparkeriidae (Reptilia: Archosauriformes) and the origins of Archosauria: a revision of Dorosuchus neoetus from the Mid-Triassic of Russia
Euparkeria capensis is resolved as the sister taxon to crown Archosauria in many cladistic phylogenies and provides a key outgroup which may approximate the ancestral archosaur morphology. Several other taxa have been referred to the family Euparkeriidae, but the monophyly of this taxon remains doubtful and largely untested. In order to test this monophyly, the archosauriform and putative euparkeriid Dorosuchus neoetus from the Mid-Triassic of Russia is reexamined in light of recent work on the evolution of stem archosaurs. Dorosuchus neoetus is found to possess a number of morphological features that place it close to Archosauria, including a sigmoidal femur with a clear attachment region for the m. caudifemoralis musculature, but no unambiguous archosaurian apomorphies. Dorosuchus neoetus is included for the first time in a numerical cladistic analysis, and is recovered as the sole sister taxon to Archosauria+Phytosauria. A monophyletic Euparkeriidae including D. neoetus and E. capensis is slightly less parsimonious. In addition, a mandible and pterygoid that were previously referred to D. neoetus subsequent to the original description of the species are also included separately within the phylogenetic analysis, and are recovered within crown Archosauria, possibly raising questions as to their correct taxonomic referral. However, this phylogenetic placement is based primarily on the absence of palatal teeth, but the presence or absence of palatal teeth exhibits considerable homoplasy within Archosauriformes. Based on other aspects of their morphology, we do not reject the referral of these elements to D. neoetus.
Figure 16 in An unusual new archosauriform from the Middle-Late Triassic of southern Brazil and the monophyly of Doswelliidae
Figure 16. Character states of some new features added to the data matrix. Several ilia in lateral view: A, Mesosuchus (after Dilkes, 1998); B, Vancleavea (after Nesbitt et al., 2009a), C, Doswellia (modified from Weems, 1980); D, Erythrosuchus (after BMNH R3592); E, Chanaresuchus (after PVL 6244). Several paramedian osteoderms in dorsal view: F, Euparkeria (after SAM 5867); G, Tarjadia (after Arcucci & Marsicano, 1998); H, Archeopelta (after CPEZ-239a); I, Doswellia (modified from Dilkes & Sues, 2009); and J, Parasuchia (after SMNS 12593). Primordial sacral vertebrae of K, Euparkeria (modified from Ewer, 1965) and L, Archeopelta (after CPEZ-239a) in dorsal view. Not to the same scale.
Figure 13 in An unusual new archosauriform from the Middle-Late Triassic of southern Brazil and the monophyly of Doswelliidae
Figure 13. Paramedian osteoderms of Archeopelta. A, articulated left row and right row in B, dorsal and F, lateral views. Both rows in E, anterior and G, ventral views. C–D, close up of the first osteoderm of the left row in dorsal view. Abbreviations: aaf, anterior articular facet; ns, neural spine; p, pit; se, collateral serrations. Scale bar = 2 cm.
Figure 11 in An unusual new archosauriform from the Middle-Late Triassic of southern Brazil and the monophyly of Doswelliidae
Figure 11. Pelvic girdle of Archeopelta. A, C, ilium in posterior view; and B, D, right ischium in lateral view. Abbreviations: aw, acetabular wall; fps, first primordial sacral; iaf, ischial acetabular facet; il, ilium; ilb, iliac blade; isq, ischium; ivf, ischial ventral flange; ipvp, ischial posteroventral process; sr, sacral rib; t, tibia. Scale bar = 2 cm. Dark grey regions indicate damaged surfaces and light grey regions indicate matrix.
Figure 9 in An unusual new archosauriform from the Middle-Late Triassic of southern Brazil and the monophyly of Doswelliidae
Figure 9. First primordial sacral vertebra of Archeopelta in A, anterior; B, dorsal; and C, posterior views; and second primordial sacral in D, dorsal view. Abbreviations: hyp, hyposphene; nc, neural canal; ns, neural spine; os, osteoderm; poz, postzygapophysis; prz, prezygapophysis; sr, sacral rib; tp, transverse process; vc, vertebral centrum. Scale bar = 2 cm.
Figure 8 in An unusual new archosauriform from the Middle-Late Triassic of southern Brazil and the monophyly of Doswelliidae
Figure 8. Dorsal vertebral series of Archeopelta in A, ventral and B, right lateral views, third dorsal vertebra in C, ventral view, ninth dorsal vertebra in D, right lateral view, and first to fourth dorsal vertebrae in E, right lateral view. Abbreviations: ns, neural spine; os, osteoderm; poz, postzygapophysis; prz, prezygapophysis; tp, transverse process; vc, vertebral centrum. Scale bar = 2 cm.
Figure 7 in An unusual new archosauriform from the Middle-Late Triassic of southern Brazil and the monophyly of Doswelliidae
Figure 7. Basicranium of Archeopelta in A–B, lateral view and close up of the vestibule in C–D, lateroventral view. Abbreviations: V, exit of the trigeminal nerve; VII, exit of the facial nerve; XII, exit of the hypoglossal nerve; bsp, basypterigoid process; bt, basal tuber; ex, exoccpital; f, fossa; fo, fenestra ovalis; ls, laterosphenoid; mf, metotic foramen; oc, occpital condyle; op, opisthotic; pbs, parabasisphenoid; pp, paraoccipital process; pro, prootic; so, supraoccipital; sor, supraoccipital ridge; sp, septum; tf, typanic fossa; vs, vestibule. Scale bar = 2 cm. Black regions indicate foramina/fenestra and shadows of outplane bones, and grey regions indicate damaged surfaces.
Figure 6 in An unusual new archosauriform from the Middle-Late Triassic of southern Brazil and the monophyly of Doswelliidae
Figure 6. Basicranium of Archeopelta in A–B, anterior and C–D, anterodorsal views. Abbreviations: bsp, basypterigoid process; bt, basal tuber; cc, cerebral cavity; f, fossa; pbs, parabasisphenoid; pp, paraoccipital process; sor, supraoccipital ridge; tf, tympanic fossa. Scale bar = 2 cm. Black regions indicate foramina/fenestra and shadows of outplane bones, and grey regions indicate damaged surfaces.
Figure 15 in An unusual new archosauriform from the Middle-Late Triassic of southern Brazil and the monophyly of Doswelliidae
Figure 15. Phylogenetic relationships of Archeopelta arborensis and other basal archosauriforms. A, strict consensus tree depicting the phylogenetic position of Arc. arborensis and the Doswelliidae; and B, strict consensus tree showing absolute (left) and GC (right) bootstrap frequencies greater than 50% below the nodes and decay indexes above each node. Abbreviations: ARCHO., Archosauriformes; AVESU., Avemetatarsalia; DOSW., Doswelliidae.
Figure 2 in An unusual new archosauriform from the Middle-Late Triassic of southern Brazil and the monophyly of Doswelliidae
Figure 2. Chronostratigraphical column of the Santa Maria Supersequence showing the Archeopelta-bearing level. Modified from Zerfass et al. (2003) and stages boundary ages after Schoene et al. (2006), Schaltegger et al. (2008) (Triassic–Jurassic boundary), Mundil et al. (1996) (Anisian–Ladinian), Mundil et al. (2004) (Permo–Triassic boundary), and Muttoni et al. (2004) and Furin et al. (2006) for others.
Figure 12 in An unusual new archosauriform from the Middle-Late Triassic of southern Brazil and the monophyly of Doswelliidae
Figure 12. Hindlimb of Archeopelta. Right femur in A, medial; B, posterior; C, proximal; D, anterior views, and proximal end of right tibia in E, anterior views, and F, lateral views. Abbreviations: aeg, anterior extensor groove; fh, femoral head; ft, fourth trochanter; gtr, greater trochanter; isq, ischium; pas, proximal articular surface; pmc, posteromedial condyle; pt, posterior tuberosity; t, tibia; tc, tibial condyle. Scale bar = 2cm.
Figure 10 in An unusual new archosauriform from the Middle-Late Triassic of southern Brazil and the monophyly of Doswelliidae
Figure 10. Proximal half of right humerus of Archeopelta in A, anterior; B, posterior; C, proximal; D, medial; E, lateral; and F, ventral views. Abbreviations: dc, deltopectoral crest; gt, greater tuberosity; hh, humeral head; it, internal tuberosity. Scale bar = 2 cm.
Figure 1 in An unusual new archosauriform from the Middle-Late Triassic of southern Brazil and the monophyly of Doswelliidae
Figure 1. Map of the Brazilian region showing the location of the Archeopelta-bearing site (above) and photograph of the site from which Archeopelta was collected (below). Map modified from Reichel, Schultz & Benton Soares (2009).
Figure 14 in An unusual new archosauriform from the Middle-Late Triassic of southern Brazil and the monophyly of Doswelliidae
Figure 14. Indeterminate bone of Archeopelta in several views including E, proximal view and F, cross section. Scale bar = 2 cm.
Figure 5 in An unusual new archosauriform from the Middle-Late Triassic of southern Brazil and the monophyly of Doswelliidae
Figure 5. Basicranium of Archeopelta in A–B, dorsal and C–D, ventral views. Abbreviations: bo, basisphenoid; bsp, basipterigoid process; bt, basal tuber; cc, cerebral cavity; f, fossa; icf, internal carotid foramen; ls, laterosphenoid; oc, occpital condyle; pbs, parabasisphenoid; pp, paraoccipital process; so, supraoccipital; sor, supraoccipital ridge; tf, tympanic fossa. Scale bar = 2 cm. Black regions indicate foramina/fenestra and shadows of outplane bones, and grey regions indicate damaged surfaces.
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International Brain Laboratory public data
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OpenNeuro
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