XXVII.—A Description of various Fossil Remains of three distinct Saurian Animals, recently discovered in the Magnesian Conglomerate near Bristol.

Riley, Henry T.; Stutchbury, Samuel

doi:10.1144/transgslb.5.2.349

Cited by 25 publications

(10 citation statements)

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“…The lack of anteroposterior constriction of this bone contrasts with the slender, rod‐like shape of the radial shaft in a number of nonsauropodan sauropodomorphs (e.g. Thecodontosaurus Riley & Stutchbury, ; Plateosaurus ; Lufengosaurus ; Riojasaurus ). In medial and lateral views the radius is markedly similar to that of Melanorosaurus (SAM‐PK‐K3532) and Lessemsaurus (‘lateral’ view in Pol & Powell, : fig.…”

Section: Resultsmentioning

confidence: 82%

The complete anatomy and phylogenetic relationships ofAntetonitrus ingenipes(Sauropodiformes, Dinosauria): implications for the origins of Sauropoda

Yates²,

et al. 2014

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We present a comprehensive description and phylogenetic analysis of the important transitional sauropodomorph Antetonitrus ingenipes. New information sheds light on the stepwise acquisition of sauropod-like traits just prior to the Triassic/Jurassic boundary. Although the forelimb of Antetonitrus and other closely related sauropodomorph taxa retains the plesiomorphic morphology typical of a mobile grasping structure, the changes in the weightbearing dynamics of both the musculature and the architecture of the hindlimb document the progressive shift towards a sauropodan form of graviportal locomotion. Nonetheless, the presence of hypertrophied muscle attachment sites in the femur of Antetonitrus suggests the retention of an intermediary form of facultative bipedalism. The term Sauropodiformes is adopted here and given a novel definition intended to capture those transitional sauropodomorph taxa occupying a contiguous position on the pectinate line towards Sauropoda. A re-examination of the biased distribution of Sauropodomorpha in the earliest Jurassic suggests the presence of genuine palaeoenvironmental processes that may have excluded the large-bodied, graviportal taxa from participating in a number of Early Jurassic ecosystems.

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Section: Resultsmentioning

confidence: 82%

The complete anatomy and phylogenetic relationships ofAntetonitrus ingenipes(Sauropodiformes, Dinosauria): implications for the origins of Sauropoda

Yates²,

et al. 2014

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“…New discoveries are not driving back the geological age of the oldest sauropodomorphs [e.g. Thecodontosaurus , from the late Carnian–Rhaetian of the UK, was the first sauropodomorph to be scientifically described (Riley & Stutchbury, 1836) and still remains one of the oldest known], nor are they extending our knowledge into younger time periods [e.g. Magyarosaurus from the late Maastrichtian of Romania was described by Nopcsa (1915), but no Paleogene sauropods have been recovered subsequently].…”

Section: Analyses and Resultsmentioning

confidence: 99%

Testing the effect of the rock record on diversity: a multidisciplinary approach to elucidating the generic richness of sauropodomorph dinosaurs through time

et al. 2010

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The accurate reconstruction of palaeobiodiversity patterns is central to a detailed understanding of the macroevolutionary history of a group of organisms. However, there is increasing evidence that diversity patterns observed directly from the fossil record are strongly influenced by fluctuations in the quality of our sampling of the rock record; thus, any patterns we see may reflect sampling biases, rather than genuine biological signals. Previous dinosaur diversity studies have suggested that fluctuations in sauropodomorph palaeobiodiversity reflect genuine biological signals, in comparison to theropods and ornithischians whose diversity seems to be largely controlled by the rock record. Most previous diversity analyses that have attempted to take into account the effects of sampling biases have used only a single method or proxy: here we use a number of techniques in order to elucidate diversity. A global database of all known sauropodomorph body fossil occurrences (2024) was constructed. A taxic diversity curve for all valid sauropodomorph genera was extracted from this database and compared statistically with several sampling proxies (rock outcrop area and dinosaur-bearing formations and collections), each of which captures a different aspect of fossil record sampling. Phylogenetic diversity estimates, residuals and sample-based rarefaction (including the first attempt to capture 'cryptic' diversity in dinosaurs) were implemented to investigate further the effects of sampling. After 'removal' of biases, sauropodomorph diversity appears to be genuinely high in the Norian, Pliensbachian-Toarcian, Bathonian-Callovian and Kimmeridgian-Tithonian (with a small peak in the Aptian), whereas low diversity levels are recorded for the Oxfordian and Berriasian-Barremian, with the Jurassic/Cretaceous boundary seemingly representing a real diversity trough. Observed diversity in the remaining Triassic-Jurassic stages appears to be largely driven by sampling effort. Late Cretaceous diversity is difficult to elucidate and it is possible that this interval remains relatively under-sampled. Despite its distortion by sampling biases, much of sauropodomorph palaeobiodiversity can be interpreted as a reflection of genuine biological signals, and fluctuations in sea level may account for some of these diversity patterns.

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“…For example, a second prosauropod is known from the Upper Triassic of the Bristol and south Wales regions. Thecodontosaurus antiquus Morris, a presumed anchisaurid, is based upon a partial jaw with teeth, ostensibly from the so-called Dolomitic (or 'Magnesian') Conglomerate deposits at the edge of Durdham Down/Black Boy Hill (ST 572 747), Bristol (Riley & Stutchbury, 1836). Although the holotype and much associated material is claimed to have been destroyed with the bombing of Bristol City Museum, associated remains (figured by Huene, 1908) still exist (BRSMG C4528, (24530-4, Ca7451, Ca7466-7, Ca7473-5, Ca7481-2, Ca7485-6, Ca7490, Ca7494-7, Ca7499, Ca7501, Ca7504, Ca7507, Ca75 10, Cb47 15), including a second(?)…”

Section: Miscellaneous Repilesmentioning

confidence: 99%

Fossil vertebrate faunas of the British Rhaetian (latest Triassic)

Storrs¹

1994

Zoological Journal of the Linnean Society

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Rhaetian fossil vertebrate faunas of Britain represent rich but biased samples of taxonomic diversity during uppermost Triassic time. Review of the Westbury Formation, Penarth Group, in particular, reveals a combination of marine, littoral, and terrestrial elements. Minimally, six species of shark are preserved along with a myriacanthid holocephalan, at least four actinopterygian taxa, a characteristic lungfish, ichthyosaurs, plesiosaurs, dinosaurs, and potentially the earliest representative of the Choristodera. Rare mammalian occurrences in the Westbury beds are also possible. Severnichthys gen. nov. is a large osteichthyan, probably a palaeonisciform chondrostean, which historically has been mistaken for a labyrinthodont amphibian. At least two additional actinopterygian species and a holocephalan are known from die Lilstock Formation, and a mammal or mammallike reptile is recorded from the uppermost Blue Anchor Formation. Analysis of element abundance in the disarticulated Westbury Formation assemblage indicates that many parts of some taxa are never preserved while other elements of the same form are common. Such preservational bias suggests that many species may be missing entirely from this long‐studied but poorly understood taphocoenosis. Possibly contemporaneous cave faunas from nearby upland areas give a similarly biased picture of the terrestrial fauna during this time of widespread marine transgression.

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XXVII.—A Description of various Fossil Remains of three distinct Saurian Animals, recently discovered in the Magnesian Conglomerate near Bristol.

Cited by 25 publications

References 0 publications

The complete anatomy and phylogenetic relationships ofAntetonitrus ingenipes(Sauropodiformes, Dinosauria): implications for the origins of Sauropoda

The complete anatomy and phylogenetic relationships ofAntetonitrus ingenipes(Sauropodiformes, Dinosauria): implications for the origins of Sauropoda

Testing the effect of the rock record on diversity: a multidisciplinary approach to elucidating the generic richness of sauropodomorph dinosaurs through time

Fossil vertebrate faunas of the British Rhaetian (latest Triassic)

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