The present 3D Dataset contains the 3D models produced for the paper "Szczygielski, T., Celestin, F., Adnet, S., Guinot, G., 2026. Triassic turtles of France: the first European Rhaetian stem turtle taxon (clades Testudinata, Proterochersidae). Swiss Journal of Palaeontology". The digitized material consists of shell and appendicular skeleton fragments of the first diagnostic stem turtle from the European Rhaetian and showcases a number of autapomorphic characters. 

Bartassochersis lopezi UM-PDE2-01 View specimen

M3#1907 Left axillary region and base of the anterior plastral lobe (left hyoplastron, small medial fragment of the right hyoplastron, part of the posterior process of the entoplastron) Type: "3D_surfaces" doi: 10.18563/m3.sf.1907   state:in_press

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Bartassochersis lopezi UM-PDE2-02 View specimen

M3#1908 Posterior plastral lobe Type: "3D_surfaces" doi: 10.18563/m3.sf.1908   state:in_press

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Bartassochersis lopezi UM-PDE2-03 View specimen

M3#1909 First vertebral scute region, right side Type: "3D_surfaces" doi: 10.18563/m3.sf.1909   state:in_press

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Bartassochersis lopezi UM-PDE2-04 View specimen

M3#1910 ?Carapace fragment Type: "3D_surfaces" doi: 10.18563/m3.sf.1910   state:in_press

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Bartassochersis lopezi UM-PDE2-05 View specimen

M3#1911 Left scapula Type: "3D_surfaces" doi: 10.18563/m3.sf.1911   state:in_press

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Bartassochersis lopezi UM-PDE2-06 View specimen

M3#1912 Ungual Type: "3D_surfaces" doi: 10.18563/m3.sf.1912   state:in_press

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Bartassochersis lopezi UM-PDE2-08 View specimen

M3#1913 Right hypoplastron Type: "3D_surfaces" doi: 10.18563/m3.sf.1913   state:in_press

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Bartassochersis lopezi UM-PDE2-09 View specimen

M3#1914 Indeterminate Type: "3D_surfaces" doi: 10.18563/m3.sf.1914   state:in_press

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Bartassochersis lopezi UM-PDE2-10 View specimen

M3#1915 ?Mesoplastron/hypoplastron Type: "3D_surfaces" doi: 10.18563/m3.sf.1915   state:in_press

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Bartassochersis lopezi UM-PDE2-11 View specimen

M3#1916 Left inguinal periphery (peripheral, hyoplastron) Type: "3D_surfaces" doi: 10.18563/m3.sf.1916   state:in_press

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Bartassochersis lopezi UM-PDE2-12 View specimen

M3#1917 ?Left side of a vertebral scute area with two partial pleural scute areas Type: "3D_surfaces" doi: 10.18563/m3.sf.1917   state:in_press

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Bartassochersis lopezi UM-PDE2-13 View specimen

M3#1918 ?Posterior pleural and supramarginal of marginal areas Type: "3D_surfaces" doi: 10.18563/m3.sf.1918   state:in_press

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Bartassochersis lopezi UM-PDE2-14 View specimen

M3#1919 Posterior peripherals Type: "3D_surfaces" doi: 10.18563/m3.sf.1919   state:in_press

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Bartassochersis lopezi UM-PDE2-15A View specimen

M3#1920 ?Left edge of the anterior plastral lobe Type: "3D_surfaces" doi: 10.18563/m3.sf.1920   state:in_press

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Bartassochersis lopezi UM-PDE2-15B View specimen

M3#1921 Indeterminate Type: "3D_surfaces" doi: 10.18563/m3.sf.1921   state:in_press

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Bartassochersis lopezi UM-PDE2-16 View specimen

M3#1922 Indeterminate Type: "3D_surfaces" doi: 10.18563/m3.sf.1922   state:in_press

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Bartassochersis lopezi UM-PDE2-17 View specimen

M3#1923 ?Bridge fragment Type: "3D_surfaces" doi: 10.18563/m3.sf.1923   state:in_press

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Bartassochersis lopezi UM-PDE2-19 View specimen

M3#1924 Right bridge region Type: "3D_surfaces" doi: 10.18563/m3.sf.1924   state:in_press

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Bartassochersis lopezi UM-PDE2-20 View specimen

M3#1925 Left femoral bulge Type: "3D_surfaces" doi: 10.18563/m3.sf.1925   state:in_press

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Bartassochersis lopezi UM-PDE2-21 View specimen

M3#1926 Indeterminate Type: "3D_surfaces" doi: 10.18563/m3.sf.1926   state:in_press

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Turtles are one of the most impressive vertebrates. Much of the body is either hidden in a shell or can be drawn into it. Turtles impress with their individual longevity and their often peaceful disposition. Also, with their resilience, they have survived all extinction events since their emergence in the Late Triassic. Today's diversity of shapes is impressive and ranges from the large and high domed Galapagos turtles to the hamster-sized flat pancake turtles. The holotype of one of the oldest fossil turtles, Proganochelys quenstedtii, is housed in the paleontological collection in Tübingen/Germany. Since its discovery some years before 1873, P. quenstedtii has represented the 'prototype' of the turtle and has had an eventful scientific history. It was found in Neuenhaus (Häfner-Neuhausen in Schönbuch forest), Baden-Württemberg, Germany, and stems from Löwenstein-Formation (Weißer Keupersandstein), Late Triassic. The current catalogue number is GPIT-PV-30000. The specimen is listed in the historical inventory “Tübinger Petrefaktenverzeichnis 1841 bis 1896, [folio 326v.]“, as “[catalogue number: PV]16549, Schildkröte Weiser Keupersandstein Hafnerhausen” [turtle from White Keuper Sandstone]. Another, more recent synonym is “GPIT/RE/9396”. The same specimen was presented as uncatalogued by Gaffney (1990). Here we provide a surface scan of the steinkern for easier access of this famous specimen to the scientific community.
  

Proganochelys quenstedtii GPIT-PV-30000 View specimen

M3#967 This the surface model of the steinkern of the shell of Proganochelys quenstedtii. Type: "3D_surfaces" doi: 10.18563/m3.sf.967   state:published

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