Using X-ray microtomography, we describe the ossification events during the larval development of a non-teleost actinopterygian species: the Cuban gar Atractosteus tristoechus from the order Lepisosteiformes. We provide a detailed developmental series for each anatomical structure, covering a large sequence of mineralization events going from an early stage (13 days post-hatching, 21mm total length) to an almost fully ossified larval stage (118dph or 87mm in standard length). With this work, we expect to bring new developmental data to be used in further comparative studies with other lineages of bony vertebrates. We also hope that the on-line publication of these twelve successive 3D reconstructions, fully labelled and flagged, will be an educational tool for all students in comparative anatomy. 

Atractosteus tristoechus At1-13dph View specimen

M3#94 At1-13dph : 13 dph larvae, 21 mm TL Type: "3D_surfaces" doi: 10.18563/m3.sf.94   state:published

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Atractosteus tristoechus At2-16dph View specimen

M3#95 Atractosteus tristoechus larva, 16 dph, 26mm SL. Type: "3D_surfaces" doi: 10.18563/m3.sf.95   state:published

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Atractosteus tristoechus At3-19dph View specimen

M3#96 Atractosteus tristoechus larva, 19 dph, 27mm SL. Type: "3D_surfaces" doi: 10.18563/m3.sf.96   state:published

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Atractosteus tristoechus At4-22dph View specimen

M3#97 Atractosteus tristoechus larva, 22dph, 30mm SL. Type: "3D_surfaces" doi: 10.18563/m3.sf.97   state:published

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Atractosteus tristoechus At5-26dph View specimen

M3#98 Atractosteus tristoechus larva, 26 dph, 32mm SL. Type: "3D_surfaces" doi: 10.18563/m3.sf.98   state:published

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Atractosteus tristoechus At6-31dph View specimen

M3#99 Atractosteus tristoechus larva, 31 dph, 39mm SL. Type: "3D_surfaces" doi: 10.18563/m3.sf.99   state:published

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Atractosteus tristoechus At7-37dph View specimen

M3#100 Atractosteus tristoechus larva, 37 dph, 43mm SL. Type: "3D_surfaces" doi: 10.18563/m3.sf.100   state:published

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Atractosteus tristoechus At8-52dph View specimen

M3#101 Atractosteus tristoechus larva, 52 dph, 46mm SL. Type: "3D_surfaces" doi: 10.18563/m3.sf.101   state:published

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Atractosteus tristoechus At9-74dph View specimen

M3#102 Atractosteus tristoechus larva, 74 dph, 61mm SL. Not all structures are colored, only newly ossified ones. Type: "3D_surfaces" doi: 10.18563/m3.sf.102   state:published

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Atractosteus tristoechus At10-89dph View specimen

M3#103 Atractosteus tristoechus larva, 89 dph, 63mm SL. Not all structures are colored, only newly ossified ones. You may find the tag file in the At1-13dph reconstruction data. Type: "3D_surfaces" doi: 10.18563/m3.sf.103   state:published

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Atractosteus tristoechus At11-104dph View specimen

M3#104 Atractosteus tristoechus larva, 104 dph, 70mm SL. Not all structures are colored, only newly ossified ones. Type: "3D_surfaces" doi: 10.18563/m3.sf.104   state:published

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Atractosteus tristoechus At12-118dph View specimen

M3#105 Atractosteus tristoechus larva, 118 dph, 87mm SL. Type: "3D_surfaces" doi: 10.18563/m3.sf.105   state:published

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The presented dataset contains the 3D surface scan of the holotype of Birgeria americana, a partial skull described and depicted in: Romano, C., Jenks, J.F., Jattiot, R., Scheyer, T.M., Bylund, K.G. & Bucher, H. 2017. Marine Early Triassic Actinopterygii from Elko County (Nevada, USA): implications for the Smithian equatorial vertebrate eclipse. Journal of Paleontology. https://doi.org/10.1017/jpa.2017.36 . 

Birgeria americana NMMNH P-66225 View specimen

M3#175 NMMNH P-66225 is from upper lower Smithian to lower upper Smithian beds (Thaynes Group). The collecting site is located about 2.75 km south-southeast of the Winecup Ranch, east-central Elko County, Nevada, USA. P-66225 is a partial skull preserved within a large limestone nodule, with its right side exposed. It preserves the portion between the cleithrum posteriorly, and the level of the hind margin of the orbital opening anteriorly. The fossil has a length of 26 cm. Type: "3D_surfaces" doi: 10.18563/m3.sf.175   state:published

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The present contribution contains the 3D model and dataset analyzed in the following publication: Scheyer, T. M., J. M. Neenan, T. Bodogan, H. Furrer, C. Obrist, and M. Plamondon. 2017. A new, exceptionally preserved juvenile specimen of Eusaurosphargis dalsassoi (Diapsida) and implications for Mesozoic marine diapsid phylogeny. Scientific Reports, https://doi.org/10.1038/s41598-017-04514-x . 

Eusaurosphargis dalsassoi PIMUZ A/III 4380 View specimen

	M3#179 94 extracted surfaces of skeletal elements of PIMUZ A/III 4380 Type: "3D_surfaces" doi: 10.18563/m3.sf.179   state:published	Download 3D surface file
	M3#180 Accompanying CT scan dataset Type: "3D_CT" doi: 10.18563/m3.sf.180   state:published	Download CT data

This contribution contains the 3D models described and figured in the following publication: Mennecart B., de Perthuis Ad., Rössner G.E., Guzmán J.A., de Perthuis Au., Costeur L. The first French tragulid skull (Mammalia, Ruminantia, Tragulidae) and associated tragulid remains from the Middle Miocene of Contres (Loir-et-Cher, France). Comptes Rendus Palévol. https://doi.org/10.1016/j.crpv.2017.08.004 

Dorcatherium crassum NMB Fa.213.abg View specimen

M3#181 The 3D surface files of the specimen NMB Fa.213 are the reconstructions of the main skull fragments, the right petrosal bone, and the left bony labyrinth. Type: "3D_surfaces" doi: 10.18563/m3.sf.181   state:published

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