Imperial College London

DrSusannahMaidment

Faculty of EngineeringDepartment of Earth Science & Engineering

Honorary Lecturer
 
 
 
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Contact

 

s.maidment

 
 
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Location

 

3.55Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

72 results found

Spiekman SNF, Fernandez V, Butler RJ, Dollman KN, Maidment SCRet al., 2023, A taxonomic revision and cranial description of Terrestrisuchus gracilis (Archosauria, Crocodylomorpha) from the Upper Triassic of Pant-y-Ffynnon Quarry (southern Wales), Papers in Palaeontology, Vol: 9

Non-crocodyliform crocodylomorphs, formerly referred to the informal group ‘Sphenosuchia’, are the earliest known crocodylomorph precursors of extant crocodylians. They are therefore crucial for our understanding of early crocodylian evolution and the origin of typical crocodylian characteristics, such as the formation of a secondary palate, complex cranial pneumaticity, and a reinforced braincase. Terrestrisuchus gracilis, known from the Upper Triassic fissure fill deposits of Pant-y-Ffynnon in southern Wales, is represented by almost 200 specimens, comprising articulated, partially associated, and isolated remains. In this contribution we provide a taxonomic revision of Terrestrisuchus gracilis and redescribe its cranial anatomy in detail, based in part on novel micro-computed tomography data. The posterior skull region is extensively pneumatized as indicated, among other features, by large pre- and postcarotid recesses on the parabasisphenoid, and a large pneumatic cavity in the articular of the mandible. In contrast, the quadrate forms only a small, unfused contact with the prootic, suggesting that complex pneumatization of the postorbital region pre-dated the co-ossification of the quadrate and braincase in Crocodylomorpha. Terrestrisuchus gracilis preserves an ossified basihyal, which represents the first occurrence of this bone in non-avemetatarsalian archosaurs. Finally, we show that Terrestrisuchus gracilis was probably cathemeral (i.e. active in a range of light levels), based on a phylogenetic flexible discriminant analysis of the relative dimensions of the sclerotic ring and orbit.

Journal article

Oussou A, Falkingham PL, Butler RJ, Boumir K, Ouarhache D, Ech-charay K, Charriere A, Maidment SCRet al., 2023, New Middle to ?Late Jurassic dinosaur tracksites in the Central High Atlas Mountains, Morocco, ROYAL SOCIETY OPEN SCIENCE, Vol: 10, ISSN: 2054-5703

Journal article

Dempsey M, Maidment SCR, Hedrick BP, Bates KTet al., 2023, Convergent evolution of quadrupedality in ornithischian dinosaurs was achieved through disparate forelimb muscle mechanics, PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Vol: 290, ISSN: 0962-8452

Journal article

Bonsor JA, Lockwood JAF, Leite JV, Scott-Murray A, Maidment SCRet al., 2023, THE OSTEOLOGY OF THE HOLOTYPE OF THE BRITISH IGUANODONTIAN DINOSAUR<i>MANTELLISAURUS ATHERFIELDENSIS</i>, Monographs of the Palaeontographical Society, Vol: 177, Pages: 1-63, ISSN: 0269-3445

Journal article

Maidment SCR, Chapelle KEJ, Bonsor JA, Button D, Barrett PMet al., 2022, OSTEOLOGY AND RELATIONSHIPS OF <i>CUMNORIA PRESTWICHII</i> (ORNITHISCHIA: ORNITHOPODA) FROM THE LATE JURASSIC OF OXFORDSHIRE, UK, Monographs of the Palaeontographical Society, Vol: 176, Pages: 1-55, ISSN: 0269-3445

Journal article

Maher AE, Burin G, Cox PG, Maddox TW, Maidment SCR, Cooper N, Schachner ER, Bates KTet al., 2022, Body size, shape and ecology in tetrapods, NATURE COMMUNICATIONS, Vol: 13

Journal article

Falkingham PL, Maidment SCR, Lallensack JN, Martin JE, Suan G, Cherns L, Howells C, Barrett PMet al., 2022, Late Triassic dinosaur tracks from Penarth, south Wales, GEOLOGICAL MAGAZINE, Vol: 159, Pages: 821-832, ISSN: 0016-7568

Journal article

Bestwick J, Godoy PL, Maidment SCR, Ezcurra MD, Wroe M, Raven TJ, Bonsor JA, Butler RJet al., 2022, Relative skull size evolution in Mesozoic archosauromorphs: potential drivers and morphological uniqueness of erythrosuchid archosauriforms, PALAEONTOLOGY, Vol: 65, ISSN: 0031-0239

Journal article

Dai H, Li N, Maidment SCR, Wei G, Zhou Y, Hu X, Ma Q, Wang X, Hu H, Peng Get al., 2022, New Stegosaurs from the Middle Jurassic Lower Member of the Shaximiao Formation of Chongqing, China, JOURNAL OF VERTEBRATE PALEONTOLOGY, Vol: 41, ISSN: 0272-4634

Journal article

Maidment SCR, Strachan SJ, Ouarhache D, Scheyer TM, Brown EE, Fernandez V, Johanson Z, Raven TJ, Barrett PMet al., 2021, Bizarre dermal armour suggests the first African ankylosaur, NATURE ECOLOGY & EVOLUTION, Vol: 5, Pages: 1576-+, ISSN: 2397-334X

Journal article

Lockwood JAF, Martill DM, Maidment SCR, 2021, A new hadrosauriform dinosaur from the Wessex Formation, Wealden Group (Early Cretaceous), of the Isle of Wight, southern England, JOURNAL OF SYSTEMATIC PALAEONTOLOGY, Vol: 19, Pages: 847-888, ISSN: 1477-2019

Journal article

Spiekman SNF, Ezcurra MD, Butler RJ, Fraser NC, Maidment SCRet al., 2021, <i>Pendraig milnerae</i>, a new small-sized coelophysoid theropod from the Late Triassic of Wales, ROYAL SOCIETY OPEN SCIENCE, Vol: 8, ISSN: 2054-5703

Journal article

Brown EE, Butler RJ, Barrett PM, Maidment SCRet al., 2021, Assessing conflict between early neornithischian tree topologies, JOURNAL OF SYSTEMATIC PALAEONTOLOGY, Vol: 19, Pages: 1183-1206, ISSN: 1477-2019

Journal article

Breeden BT, Raven TJ, Butler RJ, Rowe TB, Maidment SCRet al., 2021, The anatomy and palaeobiology of the early armoured dinosaur <i>Scutellosaurus lawleri</i> (Ornithischia: Thyreophora) from the Kayenta Formation (Lower Jurassic) of Arizona, ROYAL SOCIETY OPEN SCIENCE, Vol: 8, ISSN: 2054-5703

Journal article

Cashmore DD, Butler RJ, Maidment SCR, 2021, Taxonomic identification bias does not drive patterns of abundance and diversity in theropod dinosaurs, BIOLOGY LETTERS, Vol: 17, ISSN: 1744-9561

Journal article

Maidment SCR, Dean CD, Mansergh RI, Butler RJet al., 2021, Deep-time biodiversity patterns and the dinosaurian fossil record of the Late Cretaceous Western Interior, North America, PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Vol: 288, ISSN: 0962-8452

Journal article

Ezcurra MD, Butler RJ, Maidment SCR, Sansom IJ, Meade LE, Radley JDet al., 2021, A revision of the early neotheropod genus <i>Sarcosaurus</i> from the Early Jurassic (Hettangian-Sinemurian) of central England, ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY, Vol: 191, Pages: 113-149, ISSN: 0024-4082

Journal article

Maidment SCR, Sennikov AG, Ezcurra MD, Dunne EM, Gower DJ, Hedrick BP, Meade LE, Raven TJ, Paschchenko DI, Butler RJet al., 2020, The postcranial skeleton of the erythrosuchid archosauriform <i>Garjainia prima</i> from the Early Triassic of European Russia, ROYAL SOCIETY OPEN SCIENCE, Vol: 7, ISSN: 2054-5703

Journal article

Maidment SCR, Sennikov AG, Ezcurra MD, Dunne EM, Gower DJ, Hedrick BP, Meade LE, Raven TJ, Paschchenko DI, Butler RJet al., 2020, The postcranial skeleton of the erythrosuchid archosauriform Garjainia prima from the Early Triassic of European Russia: Postcrania of Garjainia prima, Royal Society Open Science, Vol: 7

Erythrosuchidae were large-bodied, quadrupedal, predatory archosauriforms that dominated the hypercarnivorous niche in the aftermath of the Permo-Triassic mass extinction. Garjainia, one of the oldest members of the clade, is known from the late Olenekian of European Russia. The holotype of Garjainia prima comprises a well-preserved skull, but highly incomplete postcranium. Recent taxonomic reappraisal demonstrates that material from a bone bed found close to the type locality, previously referred to as 'Vjushkovia triplicostata', is referable to G. prima. At least, seven individuals comprising cranial remains and virtually the entire postcranium are represented, and we describe this material in detail for the first time. An updated phylogenetic analysis confirms previous results that a monophyletic Garjainia is the sister taxon to a clade containing Erythrosuchus, Shansisuchus and Chalishevia. Muscle scars on many limb elements are clear, allowing reconstruction of the proximal locomotor musculature. We calculate the body mass of G. prima to have been 147-248 kg, similar to that of an adult male lion. Large body size in erythrosuchids may have been attained as part of a trend of increasing body size after the Permo-Triassic mass extinction and allowed erythrosuchids to become the dominant carnivores of the Early and Middle Triassic.

Journal article

Dean CD, Chiarenza AA, Maidment SCR, 2020, Formation binning: a new method for increased temporal resolution in regional studies, applied to the Late Cretaceous dinosaur fossil record of North America, PALAEONTOLOGY, Vol: 63, Pages: 881-901, ISSN: 0031-0239

Journal article

Hao B-Q, Ye Y, Maidment SCR, Bertazzo S, Peng G-Z, You H-Let al., 2020, Femoral osteopathy in<i>Gigantspinosaurus sichuanensis</i>(Dinosauria: Stegosauria) from the Late Jurassic of Sichuan Basin, Southwestern China, HISTORICAL BIOLOGY, Vol: 32, Pages: 1028-1035, ISSN: 0891-2963

Journal article

Panciroli E, Funston GF, Holwerda F, Maidment SCR, Foffa D, Larkin N, Challands T, Depolo PE, Goldberg D, Humpage M, Ross D, Wilkinson M, Brusatte SLet al., 2020, First dinosaur from the Isle of Eigg (Valtos Sandstone Formation, Middle Jurassic), Scotland, EARTH AND ENVIRONMENTAL SCIENCE TRANSACTIONS OF THE ROYAL SOCIETY OF EDINBURGH, Vol: 111, Pages: 157-172, ISSN: 1755-6910

Journal article

Raven TJ, Barrett PM, Pond SB, Maidment SCRet al., 2020, Osteology and Taxonomy of British Wealden Supergroup (Berriasian-Aptian) Ankylosaurs (Ornithischia, Ankylosauria), JOURNAL OF VERTEBRATE PALEONTOLOGY, Vol: 40, ISSN: 0272-4634

Journal article

Maidment SCR, Raven TJ, Ouarhache D, Barrett PMet al., 2020, North Africa's first stegosaur: Implications for Gondwanan thyreophoran dinosaur diversity, GONDWANA RESEARCH, Vol: 77, Pages: 82-97, ISSN: 1342-937X

Journal article

Butler RJ, Sennikov AG, Dunne EM, Ezcurra MD, Hedrick BP, Maidment SCR, Meade LE, Raven TJ, Gower DJet al., 2019, Cranial anatomy and taxonomy of the erythrosuchid archosauriform <i>'Vjushkovia</i> <i>triplicostata</i>' Huene, 1960, from the Early Triassic of European Russia, ROYAL SOCIETY OPEN SCIENCE, Vol: 6, ISSN: 2054-5703

Journal article

Maidment S, Muxworthy A, 2019, A chronostratigraphic framework for the Upper Jurassic Morrison Formation, western USA, Journal of Sedimentary Research, Vol: 89, Pages: 1017-1038, ISSN: 1527-1404

The fluvial, overbank, and lacustrine deposits of the Upper Jurassic Morrison Formation of the Western Interior, U.S.A. have been intensively studied due to their diverse and well-preserved dinosaurian fauna, and the presence of economic quantities of uranium and vanadium ores. The formation crops out over 12 degrees of latitude and 1.2 million km2, and is an excellent case study for the examination of paleoecology, community structure, and evolutionary dynamics at a time in Earth’s history when the climate was significantly warmer than today. However, paleoecological studies have been hampered by lack of correlation across the formation. Assuming a primarily tectonic control on fluvial architecture, we propose the first chronostratigraphic framework of the formation, which is based on sequence stratigraphy, magnetostratigraphy, and radiometric dating. The formation can be divided into three sequences each represented by a period of degradation followed by aggradation. This chronostratigraphic framework indicates that the formation youngs to the north, and was deposited over about 7 million years during the late Kimmeridgian and Tithonian. This framework provides a foundation for future sedimentological, stratigraphic, and paleobiological studies of the iconic dinosaurian fauna known from the Morrison.

Journal article

Raven TJ, Barrett PM, Xu X, Maidment SCRet al., 2019, A reassessment of the purported ankylosaurian dinosaur <i>Bienosaurus lufengensis</i> from the Lower Lufeng Formation of Yunnan, China, ACTA PALAEONTOLOGICA POLONICA, Vol: 64, Pages: 335-342, ISSN: 0567-7920

Journal article

Woodruff DC, Trexler D, Maidment SCR, 2019, Two new stegosaur specimens from the Upper Jurassic Morrison Formation of Montana, USA, ACTA PALAEONTOLOGICA POLONICA, Vol: 64, Pages: 461-480, ISSN: 0567-7920

Journal article

Maidment SCR, Woodruff DC, Horner JR, 2018, A NEW SPECIMEN OF THE ORNITHISCHIAN DINOSAUR <i>HESPEROSAURUS MJOSI</i> FROM THE UPPER JURASSIC MORRISON FORMATION OF MONTANA, USA, AND IMPLICATIONS FOR GROWTH AND SIZE IN MORRISON STEGOSAURS, JOURNAL OF VERTEBRATE PALEONTOLOGY, Vol: 38, ISSN: 0272-4634

Journal article

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