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330 results for “Upper Triassic”
Fig. 27 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 27. Middle caudal vertebra of Azendohsaurus madagaskarensis (FMNH PR 3822) in (A) left lateral, (B) anterior, (C) ventral, and (D) posterior views. Scale 5 1 cm. Arrow indicates anterior direction. Abbreviations: a., articulates with; ch, chevron; nc, neural canal; ns, neural spine; poz, postzygapophysis; prz, prezygapophyses; tp, transverse process.
Fig. 28 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 28. Distal caudal vertebra of Azendohsaurus madagaskarensis (UA 7-15-99-599) in (A) left lateral, (B) dorsal, (C) ventral, (D) anterior, and (E) posterior views. Scale 5 1 cm. Abbreviations: a., articulates with; ch, chevron; ns, neural spine; poz, postzygapophysis; prz, prezygapophyses.
Fig. 34 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 34. Interclavicles of Azendohsaurus madagaskarensis. Interclavicle (FMNH PR 2781) in (A) ventral, (B) dorsal, and (C) left lateral views. Pathological interclavicle (UA 7-16-99-620) in (D) ventral and (E) dorsal views. Scales 5 1 cm. Arrows indicate anterior direction. Abbreviations: a., articulates with; ap, anterior process; cl, clavicle; lp, lateral process; pp, posterior process.
Fig. 32 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 32. Chevron of Azendohsaurus madagaskarensis. Anterior chevron (FMNH PR 2773) (A) in proximal (top), anterior (left), and left lateral (right). Midtail chevron (FMNH PR 2773) (B) in proximal (top), anterior (left), and left lateral (right). Posterior portion of the tail chevron (FMNH PR 2772) (C) in proximal (top), anterior (left), and left lateral (right). Scale 5 1 cm.
Fig. 40 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 40. Left radius of Azendohsaurus madagaskarensis (UA 8-29-97-153) in (A) proximal, (B) anterior,
Fig. 37 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 37. Left coracoid of Azendohsaurus madagaskarensis (FMNH PR 3822) in (A) lateral, (B) proximal, and (C) medial views. Scale 5 1 cm. Arrows indicate anterior direction. Abbreviations: a., articulates with; cf, coracoid foramen; gl, glenoid; pg, postglenoid process; sc, scapula.
Text-fig. 6. Taimyria triassica NAUGOLNYKH et MOGUTCHEVA gen. et sp. nov., holotype 4287/6. Epidermal-cuticular structure of upper surface of seed-bearing capsule. a–c, e–g: cuticles of upper surface of seed-bearing capsule, b – detail of (a), notice small white spot at picture center, which could be interpreted as scar of small monocellular trichome; d: conducting strand going to seed scar. Locality: Tsvetkov Cape; Lower Triassic, Induan; Keshin Formation. Scale bar 200 µm (a, c, d, g), 100 µm (e, f). in Taimyria Gen. Nov., A New Genus Of Evolutionary Advanced Gymnosperms From Triassic Of The Taimyr Peninsula, Siberia, Russia
Text-fig. 6. Taimyria triassica NAUGOLNYKH et MOGUTCHEVA gen. et sp. nov., holotype 4287/6. Epidermal-cuticular structure of upper surface of seed-bearing capsule. a–c, e–g: cuticles of upper surface of seed-bearing capsule, b – detail of (a), notice small white spot at picture center, which could be interpreted as scar of small monocellular trichome; d: conducting strand going to seed scar. Locality: Tsvetkov Cape; Lower Triassic, Induan; Keshin Formation. Scale bar 200 µm (a, c, d, g), 100 µm (e, f).
Text-fig. 5. Taimyria triassica NAUGOLNYKH et MOGUTCHEVA gen. et sp. nov., holotype 4287/6. a–d: epidermal-cuticular structure of upper surface of seed-bearing capsule. Locality: Tsvetkov Cape; Lower Triassic, Induan; Keshin Formation. Scale bar 100 µm (a, c, d), 50 µm (b). in Taimyria Gen. Nov., A New Genus Of Evolutionary Advanced Gymnosperms From Triassic Of The Taimyr Peninsula, Siberia, Russia
Text-fig. 5. Taimyria triassica NAUGOLNYKH et MOGUTCHEVA gen. et sp. nov., holotype 4287/6. a–d: epidermal-cuticular structure of upper surface of seed-bearing capsule. Locality: Tsvetkov Cape; Lower Triassic, Induan; Keshin Formation. Scale bar 100 µm (a, c, d), 50 µm (b).
Text-fig. 7. Taimyria triassica NAUGOLNYKH et MOGUTCHEVA gen. et sp. nov., holotype 4287/6. Line drawing of epidermal cuticle of upper surface of seed-bearing disc showing stoma. Locality: Tsvetkov Cape; Lower Triassic, Induan; Keshin Formation. Scale bar 100 µm. in Taimyria Gen. Nov., A New Genus Of Evolutionary Advanced Gymnosperms From Triassic Of The Taimyr Peninsula, Siberia, Russia
Text-fig. 7. Taimyria triassica NAUGOLNYKH et MOGUTCHEVA gen. et sp. nov., holotype 4287/6. Line drawing of epidermal cuticle of upper surface of seed-bearing disc showing stoma. Locality: Tsvetkov Cape; Lower Triassic, Induan; Keshin Formation. Scale bar 100 µm.
Data from: Potentials of closed contour analysis in species differentiation and holotype designation: a case study on lower Norian (Upper Triassic) conodonts
<p><span>Geometric morphometric approaches become increasingly applied in the fields of biology and paleontology. Taxonomy is a good example, where a long-standing intention of scientists is to eliminate subjectivity as much as possible. In the case of biostratigraphically important conodont elements, the application of such methods is not widespread. Indeed, only a handful of studies attempted to deal with the morphological variance of conodont elements from this aspect. The detailed description of five lower Norian (Upper Triassic) taxa (<em>Ancyrogondolella quadrata, A. rigoi, A. triangularis, A. uniformis</em> and <em>Metapolygnathus mazzai</em>) is presented here based on landmarks and Fourier analysis of the P1 element and keel outlines. Both methods led to similar outcomes regarding taxonomic differentiation and exposing shape variability. Consensus shapes were generated to objectively reveal the typical contour shape of each taxon, which allowed their comparison with each other, and with the members of their respective sample population including the holotypes. The results pointed out that the holotype of a taxon is generally not an average representative, but rather a peripheral form with well-separable morphological characteristics. <em>Ancyrogondolella quadrata</em> and <em>A. rigoi</em> turned out to represent a morphological continuum with ample transitional forms between these two end-members that may cause bias in their biostratigraphic applicability; however, their combined shape variance seems to be too large for uniting them into a single species. Given the results that may be too subtle to realize based solely on qualitative observations, future taxonomic studies and type material designation could greatly benefit from the application of similar methodologies.</span></p>
Data from: Potentials of closed contour analysis in species differentiation and holotype designation: a case study on lower Norian (Upper Triassic) conodonts
Open the record for dataset details and reuse information.
Cranial morphology of a new phytosaur (Diapsida, Archosauria) from the Upper Triassic of India: implications for phytosaur phylogeny and biostratigraphy
<p>Detailed description and phylogenetic assessment of a phytosaur skull collected from the Tiki Formation of the Rewa Gondwana Basin of India and earlier diagnosed as <i>Parasuchus hislopi</i>, shows that it pertains to a new genus and species, <i>Volcanosuchus statisticae</i>. The new taxon is characterized by marginal overlapping of the nostrils by the antorbital fenestrae, external nares situated on a bulbous and raised dome, the lateral surface of the jugal ornamented by a prominent ridge defined by multiple tubercles and radiating thread-like structures, and distinct ornamentation patterns on the rostrum and skull table. Phylogenetic analysis nests <i>Volcanosuchus</i> within Mystriosuchinae where it forms a sister taxon to (<i>Rutiodon</i> + Leptosuchomorpha) and marks the transition between the basal Parasuchidae and more derived Mystriosuchinae phytosaurs. Evolution of the phytosaur skulls resulted in changes from non-overlapping nostril and antorbital fenestra to an overlapping state, anteroposterior elongation of the exoccipital and supraoccipital shelf, appearance of a median ridge on the basioccipital, and reduction of the supratemporal fenestra. Considerable faunal overlap of the Tiki Formation is evident with the lower Maleri Formation, which is late Carnian based on <i>Hyperodapedon</i>, <i>Parasuchus,</i> and <i>Exaeretodon</i>. The Tiki Formation correlates with the Ischigualasto Formation of Argentina, the upper part of the Santa Maria Formation, and the overlying lower Caturrita Formation of Brazil, the Isalo II Beds of Madagascar, Lossiemouth Sandstone of Scotland, and the lower Tecovas Formation of the Chinle Group of North America, and ranges from late Carnian to early/middle Norian.</p>
Figure 4 in A new aetosaur (Archosauria: Pseudosuchia) from the upper Blue Mesa Member (Adamanian: Early-Mid Norian) of the Late Triassic Chinle Formation, northern Arizona, USA, and a review of the paratypothoracin Tecovasuchus across the southwestern USA
Figure 4. Cation on page 9.
Data from: Puercosuchus traverorum n. gen. and sp.: a new malerisaurine azendohsaurid (Archosauromorpha: Allokotosauria) from two monodominant bonebeds in the Chinle Formation (Upper Triassic, Norian) of Arizona
<p><span><span>Non-archosaur archosauromorphs are a paraphyletic group of diapsid reptiles that are important members of global Middle Triassic and Late Triassic continental ecosystems. Included in this group are the azendohsaurids, a clade of allokotosaurians (kuehneosaurids and Azendohsauridae + Trilophosauridae) that retain the plesiomorphic archosauromorph postcranial body plan but have evolved disparate cranial features that converge on later dinosaurian anatomy, including sauropodomorph-like marginal dentition and ceratopsian-like postorbital horns. Here we describe a new malerisaurine azendohsaurid from two monodominant bonebeds in the Blue Mesa Member, Chinle Formation (Late Triassic, ~218</span><span>–</span><span>220 Ma); the first occurs at Petrified Forest National Park and preserves a minimum of eight individuals of varying sizes, and the second occurs near St. Johns, Arizona. <em>Puercosuchus traverorum</em> n. gen. and sp. is a carnivorous malerisaurine that is closely related to <em>Malerisaurus robinsonae</em> from the Maleri Formation of India and to <em>Malerisaurus langstoni</em> from the Dockum Group of western Texas. Dentigerous elements from <em>Puercosuchus traverorum</em> confirm that some Late Triassic tooth morphotypes thought to represent early dinosaurs cannot be differentiated from, and likely pertain to, <em>Puercosuchus</em>-like malerisaurine taxa. These bonebeds from northern Arizona support the hypothesis that non-archosauriform archosauromorphs were locally diverse near the middle of the Norian and experienced an extinction event prior to the end-Triassic mass extinction coincidental with the Adamanian-Revueltian boundary recognized at Petrified Forest National Park. The relatively late age of this early-diverging taxon (Norian) suggests that the diversity of azendohsaurids is underrepresented in the Middle Triassic and Late Triassic fossil records around the world.</span></span></p>
Remagnetization of upper Triassic limestone from the central Lhasa terrane (Tibet): identification, mechanisms, and implications for diagnosing secondary remanent magnetization in carbonate rocks
<p>Raw data and supplementary material for manuscript titleted "Remagnetization of Upper Triassic limestone from the central Lhasa terrane (Tibet): identification, mechanisms, and implications for diagnosing secondary remanent magnetization in carbonate rocks".</p>
Fig. 62 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 62. Right fibula of Azendohsaurus madagaskarensis (FMNH PR 3813) in (A) proximal, (B) lateral,
Fig. 74 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 74. The relationships of Allokotosauria found in the analyses of this study.
Fig. 8 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 8. The reconstructed vertebral column of Azendohsaurus madagaskarensis.
Fig. 6 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 6. Elements present in the holotype of Azendohsaurus madagaskarensis (UA 7-20-99-653).
Fig. 2 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 2. Map of the location of the holotype locality of Azendohsaurus madagaskarensis.
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