Amphicoelias altus holotype posterior dorsal vertebra (AMNH FARB 5764) in (a) anterior, (b) right lateral, (c) posterior, (d) left lateral, (e) ventral (anterior surface towards top) and (f) posterodorsal views. Blue polygon in c obscures hand used to brace the fragile vertebra for photography. acpl, anterior centroparapophyseal lamina; cpol, centropostzygapophyseal lamina; cprl, centroprezygapophyseal lamina; d, diapophysis; hs, hyposphene; lspol, lateral spinopostzygapophyseal lamina; mspol, medial spinopostzygapophyseal lamina; p, parapophysis; pcdl, posterior centrodiapophyseal lamina; pcpl, posterior centroparapophyseal lamina; podl, postzygodiapophyseal lamina; prsl, prespinal lamina; spdl, spinodiapophyseal lamina; sprl, spinoprezygapophyseal lamina; tpol, interpostzygapophyseal lamina. Scale bar, 100 mm.