Project 3970: S.J. Nesbitt, M. R. Stocker, M. D. Ezcurra, N. C. Fraser, A. B. Heckert, W. G. Parker, B Mueller, S. Sengupta, S. Bandyopadhyay, A. C. Pritchard, A. D. Marsh. 2021. Widespread azendohsaurids (Archosauromorpha, Allokotosauria) from the Late Triassic of western USA and India. Papers in Palaeontology. (In Press)
Specimen: † Malerisaurus langstoni (TMM:31099-84)
View: cross section

Abstract

Archosauromorph reptiles underwent rapid lineage diversification, increases in morphological and body size disparity, and expansion into new adaptive landscapes. Several of the primary early archosauromorph clades (e.g. rhynchosaurs) are easy to differentiate from others because of their characteristic body types, whereas the more lizard-like and carnivorous forms with long necks (e.g. tanystropheids) were historically all relegated to the group Protorosauria or Prolacertiformes. However, it is now clear that these groups are polyphyletic and that a lizard-like, carnivorous form is plesiomorphic for Archosauromorpha, and multiple subclades started with that body plan. Among these early forms is Malerisaurus from the Upper Triassic of India (M. robinsonae) and the Upper Triassic of southwestern USA (M. langstoni). In this paper, we critically reevaluate the genus. We find both species of Malerisaurus as valid, and identify Malerisaurus as an early diverging, but late-surviving, carnivorous member of Azendohsauridae within Allokotosauria. Our histological analysis and assessment of ontogenetic changes of limb bones of small and large individuals demonstrate that the skeletons of the small forms grew slowly and became more robust through ontogeny,
and that the larger recovered bones are at or near the maximum size of the taxon. Malerisaurus and Malerisauruslike forms were common members of the Otischalkian–
Adamanian (late Carnian to mid-Norian) faunal assemblages from Upper Triassic strata of the south-western USA, but they are absent from the younger Revueltian holochronozone. Specimens from western North America show that Allokotosauria had a near Pangaean distribution for much of the Middle Triassic to Late Triassic.


Project DOI: 10.7934/P3970, http://dx.doi.org/10.7934/P3970
This project containsMatrices
  • 4 Media
  • 1 Matrix
  • 69 Taxa
  • 2 Specimens
  • 339 Characters
Total size of project's media files: 1.57G

Download Project SDD File
Total scored cells: 14055
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 339
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 726
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:305/34
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MorphoBank Project 3970
  • Creation Date:
    26 March 2021
  • Publication Date:
    03 November 2021
  • Project views: 328

    This research
    supported by

    Authors' Institutions

    • Virginia Tech (Virginia Polytechnic Institute and State University)

    • Museo Argentino de Ciencias Naturales Bernardino Rivadavia



    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Sterling Nesbitt
    Project Administrator
    2240000
    (0, 0, 0)
    000
    Martin Ezcurra
    Full membership
    67003390014055
    (13493, 0, 562)
    000


    Taxonomic Overview for Matrix 'M27574' (68 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
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    member
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    [1] † Petrolacosaurus kansasensis
    Last Modified in 11/03/21
    26292290023002
    [2] † Malerisaurus-like form PEFO
    Last Modified in 11/03/21
    7926125604002
    [3] † Malerisaurus-like form large
    Last Modified in 11/03/21
    23710310101002
    [4] † Malerisaurus langstoni
    Last Modified in 06/30/21
    254838302002
    [5] † Malerisaurus all NA
    Last Modified in 11/03/21
    8227025700002
    [6] † Malerisaurus robinsonae
    Last Modified in 11/03/21
    19614913903002
    [7] † Pamelaria dolichotrachela
    Last Modified in 11/03/21
    66269263010002
    [8] † Azendohsaurus madagaskarensis
    Last Modified in 11/03/21
    14314314011002
    [9] † Azendohsaurus laaroussi
    Last Modified in 11/03/21
    297414002002
    [10] † Shringasaurus indicus
    Last Modified in 11/03/21
    12720920804002
    [11] † Trilophosaurus buettneri
    Last Modified in 11/03/21
    13307306020002
    [12] † Trilophosaurus jacobsi
    Last Modified in 11/03/21
    22111611602002
    [13] † Spinosuchus caseanus (combined)
    Last Modified in 11/03/21
    14519619301002
    [14] † Spinosuchus caseanus
    Last Modified in 11/03/21
    315242400002
    [15] † Teraterpeton hrynewichorum
    Last Modified in 11/03/21
    13320420204002
    [16] † Orovenator mayorum
    Last Modified in 11/03/21
    243919105002
    [17] † Hypuronector limnaios
    Last Modified in 11/03/21
    261747404002
    [18] † Vallesaurus cenensis
    Last Modified in 11/03/21
    20912312307002
    [19] † Megalancosaurus preonensis
    Last Modified in 11/03/21
    18814814803002
    [20] † Drepanosaurus unguicaudatus
    Last Modified in 11/03/21
    237979705002
    [21] † Dolabrosaurus aquatilis
    Last Modified in 11/03/21
    292444403002
    [22] † Avicranium renestoi
    Last Modified in 11/03/21
    2299797013002
    [23] † Coelurosauravus elivensis
    Last Modified in 11/03/21
    17115915909002
    [24] † Weigeltisaurus jaekeli
    Last Modified in 11/03/21
    21112412404002
    [25] † Rautiania spp.
    Last Modified in 11/03/21
    249838307002
    [26] † Claudiosaurus germaini
    Last Modified in 11/03/21
    7825625407002
    [27] † Acerosodontosaurus piveteaui
    Last Modified in 11/03/21
    22211111106002
    [28] † Hovasaurus boulei
    Last Modified in 11/03/21
    12720920705002
    [29] † Thadeosaurus colcanapi
    Last Modified in 11/03/21
    18215015007002
    [30] † Tropidostoma zone younginiform
    Last Modified in 11/03/21
    13320320303002
    [31] † Youngina capensis
    Last Modified in 11/03/21
    38287287014002
    [32] † Huehuecuetzpalli mixtecus
    Last Modified in 11/03/21
    15118618602002
    [33] Shinisaurus crocodilurus
    Last Modified in 06/30/21
    19298297023002
    [34] Iguana iguana
    Last Modified in 06/30/21
    18309309012002
    [35] Uromastyx acanthinura
    Last Modified in 06/30/21
    29294294016002
    [36] † Gephyrosaurus bridensis
    Last Modified in 11/03/21
    81241241017002
    [37] † Diphydontosaurus avonis
    Last Modified in 11/03/21
    11622622102002
    [38] † Planocephalosaurus robinsonae
    Last Modified in 11/03/21
    11122922602002
    [39] † Sphenotitan leyesi
    Last Modified in 11/03/21
    257777606002
    [40] † Clevosaurus brasiliensis
    Last Modified in 11/03/21
    21212712502002
    [41] † Clevosaurus hudsoni
    Last Modified in 11/03/21
    22302299018002
    [42] Sphenodon punctatum
    Last Modified in 06/30/21
    12309307020002
    [43] † Colobops noviportensis
    Last Modified in 11/03/21
    288525001002
    [44] † Protorosaurus speneri
    Last Modified in 11/03/21
    72256256011002
    [45] † Macrocnemus bassanii
    Last Modified in 11/03/21
    8824524407002
    [46] † Macrocnemus fuyuanensis
    Last Modified in 11/03/21
    11422021906002
    [47] † Amotosaurus rotfeldensis
    Last Modified in 11/03/21
    15817817704002
    [48] † Tanystropheus longobardicus
    Last Modified in 11/03/21
    2830730209002
    [49] † Ozimek volans
    Last Modified in 11/03/21
    18715215200002
    [50] † Langobardisaurus pandoflii
    Last Modified in 11/03/21
    15618018003002
    [51] † Tanytrachelos ahynis
    Last Modified in 11/03/21
    14019419405002
    [52] † Mesosuchus browni
    Last Modified in 11/03/21
    27303301011002
    [53] † Howesia browni
    Last Modified in 11/03/21
    21312212105002
    [54] † Eohyosaurus wolvaardti
    Last Modified in 11/03/21
    272686700002
    [55] † Rhynchosaurus articeps
    Last Modified in 11/03/21
    66256255018002
    [56] † Teyumbaita sulcognathus
    Last Modified in 11/03/21
    123199199017002
    [57] † Hyperodapedon gordoni
    Last Modified in 11/03/21
    91231230018002
    [58] † Boreopricea funerea
    Last Modified in 11/03/21
    12520820806002
    [59] † Prolacerta broomi
    Last Modified in 11/03/21
    19315310010002
    [60] † Proterosuchus spp
    Last Modified in 11/03/21
    4029529207002
    [61] † Proterosuchus yuani
    Last Modified in 11/03/21
    9124124107002
    [62] † Erythrosuchus africanus
    Last Modified in 11/03/21
    5227827809002
    [63] † Euparkeria capensis
    Last Modified in 11/03/21
    6626526409002
    [64] † Batrachotomus kupferzellensis
    Last Modified in 11/03/21
    49274273017002
    [65] † Plateosaurus engelhardti
    Last Modified in 11/03/21
    49259257033002
    [66] † Coelophysis bauri
    Last Modified in 11/03/21
    59251247033002
    [67] † Icarosaurus siefkeri
    Last Modified in 11/03/21
    16417217203002
    [68] † Kuehneosaurus latus
    Last Modified in 11/03/21
    6128027404002


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    Bibliography9
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    Taxon list160




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