Abstract: A new juvenile individual of sauropod from the Upper Jurassic of Zigong, Sichuan, is described in this paper · Because the new specimen（ZDM0193）has some featules that evidently differs from the known sauropods, it is named a new genus and species— Daanosaurus Zhangi and included in Bellusaurinae. The diagnosis of the genus and species is summarized as follows : Teeth are spoon-shaped . Cervicals are slightly elongated . The axis is very short and high. The cervical centrum are opsithocoelous, with long and deep pleurocoels, but no ventral keels. Ibe cavities in cervicals are well developed. The cervical neural spines are low and prominently extend anteroposteriorly with straight upper borders . The neural spines of posterior cervicals are broad, but no forked. The anterior ends of the medial cervical ribs are forked. Dorsal vertebrae are opsithocoelous. The dorsal neural spines are broad and plate-like, but no forked. The anterior chevrons are distinctly Y-shaped and without closed haenal canal . Femur is long and straight, with greatly expanded proximal and distal end. fourth trochanter is well developed .

摘要： 记述了产自四川省自贡市的一具蜥脚类幼年个体材料。根据枢椎极短而高，颈神经棘低、上缘平直、前后延长，背神经棘呈横宽的板状，中部颈肋的前突分叉等特征将它命名为一新属新种——张氏大安龙Daanosaurus zhangi gen．et sp．nov．，并将它归入巧龙亚科Bellusaurinae。