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. 2021 Jun 16;8(6):210377. doi: 10.1098/rsos.210377

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© 2021 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 6. — Comparative line drawings of posterior dorsal vertebrae of Morrison Formation diplodocoid sauropods occupying regions of the tree in which A. altus has been previously recovered and/or that have been proposed to be closely related: Haplocanthosaurus priscus (CM 572) in (a) anterior, (b) left lateral and (c) posterior views; Apatosaurus louisae (CM 3018) in (d) anterior, (e) left lateral and (f) posterior views; and Diplodocus carnegii (CM 84) in (g) anterior, (h) left lateral and (i) posterior views. Line drawings based on second or third most posterior dorsal vertebra as illustrated in Hatcher [30,55] and Gilmore [56]. al, accessory lamina; alp, aliform process; ant conv, anterior convexity; cpol, centropostzygapophyseal lamina; cprl, centroprezygapophyseal lamina; d, diapophysis; hs, hyposphene; lcpol, lateral centropostzygapophyseal lamina; lspol, lateral spinopostzygapophyseal lamina; mcpol, medial centropostzygapophyseal lamina; mspol, medial spinopostzygapophyseal lamina; nsp, neural spine; pcdl, posterior centrodiapophyseal lamina; pocdf, postzygocentrodiapophyseal fossa; posl, postspinal lamina; posr, postspinal rugosity; prsr, prespinal rugosity; pvf, posteroventrally opening fossa; spdl, spinodiapophyseal lamina; spol, spinopostzygapophyseal lamina; sprl, spinoprezygapophyseal lamina; tpol, interpostzygapophyseal lamina. Vertebrae not drawn to scale relative to one another.