Jiang, S., Li, F., Peng, G-Z. & Ye, Y. (2011) A new species of Omeisaurus from the Middle Jurassic of Zigong, Sichuan. Vertebrata Palasiatica 49(2): 185-194.

Omeisaurus jiaoi, a new species of giant sauropod is described in this paper. The specimen (ZCM 5050) was discovered from the Xiashaximiao Formation of the Middle Jurassic of Zigong Dinosaur Museum, Sichuan. ZDM 5050 is a nearly complete skeleton. Its main features can be summarized as follows: dorsal vertebrae are tall and large. The anterior dorsal vertebrae (dorsals 1 to 6) are opisthocoelous. The pleurocoels of the dorsal vertebrae are well developed except on the 1st dorsal. The neural spines are club-like and neural spines of the anterior dorsal vertebrae are not bifurcated. Caudal vertebrae are relatively short and thick. The anterior caudal vertebrae are slightly amphicoelous. The chevron of the 1st caudal vertebrae of Omeisaurus tianfuensis have no chevron. The rib of the 1st caudal vertebrae are laterally directed, being slightly fan-shaped. Humerus is long and straight, with slightly expanded proximal end and greatly expanded distal end. The deltopectoral crest is well-developed and relatively low. Femur is slender in shape, with greatly expanded proximal and distal ends. The fourth trochanter is well-developed. The ratio of the humerus to femur length is approximately 0.83, the ratio of the ulna to humerus length is approximately 0.72, and ratio of the tibia to femur length is approximately 0.63.

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