Amphicoelias altus holotype middle–posterior dorsal vertebra (AMNH FARB 5764) in (a) anterior, (b) right lateral, (c) posterior, (d) left lateral and (e) ventral (anterior surface towards top) views. acpl, anterior centroparapophyseal lamina; d, diapophysis; cpol, centropostzygapophseal lamina; cprl, centroprezygapophyseal lamina; lspol, lateral spinopostzygapophyseal lamina; mspol, medial spinopostzygapophyseal lamina; p, parapophysis; pacdf, parapophyseal centrodiapophyseal fossa; pcdl, posterior centrodiapophyseal lamina; pcpl, posterior centroparapophyseal lamina; posdf, postzygapophyseal spinodiapophyseal fossa; prdl, prezygodiapophyseal lamina; prsdf, prezygapophyseal spinodiapophyseal fossa; prsl, prespinal lamina; prz, prezygapophysis; spdl, spinodiapophyseal lamina; sprl, spinoprezygapophyseal lamina; tprl, interprezygapophyseal lamina. Scale bar, 100 mm.