JURASSIC DINOSAUR FAUNAS IN ZIGONG - 自贡恐龙博物馆

caudals fused each other with remarkably expanded neural arches; long scapula with a slender
shaft and expanded proximal and distal ends; coracoid egg-shaped; small sternum oval-shaped;
clavicle short; low and elongate ilium with extraordinarily developed pubic peduncle; ischium
slender; bones of limbs broad and slightly compressed; humerus almost 70% of femur length;
ulna about 70% of humerus length; and tibia 59% of femur length.
Holotype A very complete postcranial skeleton including 19 cervicals, 12 dorsals, 4
sacrals, 35 anterior caudals, most chevrons, and some girdles and limbs. It is housed in the
museum of Chengdu University of Technology.
Locality and horizon Taihe, Hechuan, Chongqing, Shangshaximiao Formation, Late
Jurassic.
Referred material An incomplete skeleton. It is housed in the Institute of Vertebrate
Paleontology and Paleoantropology.
Locality and horizon Haishiwan, Yongdeng, Gansu; Hengtang Group, Late Jurassic.
Included material An associated complete skeleton including fragmentary skull, many
scattered teeth, associated vertebrae, complete pectoral girdles and right forelimb, incomplete
pelvic girdles, and complete right hindlimb. ZDM 0126.
Locality and horizon Yuandingyuan, Huidong, Zigong; Shangshaximiao Formation, Late
Jurassic.
Genus Omeisaurus Young, 1939
Diagnosis Large to huge sized sauropod characterized by moderate-sized skull; robust and
spoon-shaped teeth; anterior margin of tooth crown with well developed serrations while
posterior margin with few or lacking serrations; 17 cervicals, 12 dorsals, 4 sacrals, and more than
50 caudals; neural spines of posterior cervicals and anterior dorsals no bifurcated; anterior
caudals weak amphicoelous; first caudal rib expanded as a fan-like plate.
Type species Omeisaurus junghsiensis Young, 1939.
Omeisaurus fuxiensis Dong et al., 1984
Diagnosis Smaller Omeisaurus recognized by low and elongate skull; narrow occipital
region; long and low snout; small teeth with low crowns; dental formula Pm4 + M14 / D17~19;
and elongate axis without ventral keel.
Holotype Basioccipital, a part of maxilla with teeth, left dentary, and axis. CV 00267.
Locality and horizon Wujiaba, Zigong; Shangshaximiao Formation, Late Jurassic.
Genus Zigongosaurus Hou et al., 1976
Diagnosis As for type species Zigongosaurus fuxiensis Hou et al., 1976.
Zigongosaurus fuxiensis Hou et al., 1976
Diagnosis Medium-sized sauropod about 14 m of body length. It is recognized by deep
skull with short snout; maxilla with a narrow horizontal branch and a laterally compressed
ascending process; broad and rhombohedral occipital region; thickened dentary with an expanded