Zuolong Choiniere, Clark, Forster and Xu, 2010
Z. salleei Choiniere, Clark, Forster and Xu, 2010
Early Oxfordian, Late Jurassic
Shishugou Formation, Xinjiang, China
Holotype- (IVPP V15912) (~3.1 m; ~35 kg; subadult) incomplete skull, premaxillary tooth, angular, two lateral teeth, partial axial neural arch, incomplete third cervical vertebra, incomplete fourth cervical vertebra, incomplete fifth cervical vertebra, incomplete eighth cervical vertebra, incomplete ninth cervical vertebra, partial tenth cervical neural arch, two dorsal centra, two fragmentary dorsal centra, incomplete sacrum, first caudal neural arch, second caudal neural arch, third caudal centrum, incomplete fourth caudal vertebra, three incomplete mid caudal vertebrae, two mid caudal centra, mid caudal neural arch, incomplete scapula, incomplete humerus, radius (137 mm), incomplete ulna, distal phalanx I-1, incomplete manual ungual I, partial ilium, incomplete pubes, femora (one distal; 336 mm), partial tibia, proximal fibula, partial phalanx I-1, pedal ungual I, metatarsal II (191.9 mm), phalanx II-1, metatarsal III (224.3 mm), partial metatarsal IV (~201.7 mm)
Diagnosis- (after Choiniere et al., 2010) large, slit-like quadrate foramen inclined medially at approximately 45 degrees with associated deep fossa on the quadrate; sacral centrum 5 with an obliquely oriented posterior articular surface that is angled anterodorsally; fovea capitis very large, occupying almost the entire posterodorsal surface of the femoral head; distal condyle of metatarsal III large relative to that of other metatarsals and bearing an anteromedially projecting flange on its anteromedial margin.
|Skull elements of Zuolong salleei, scaled from figures in Choiniere et al. (2010). Note the squamosal's scale bar in figure 4 is assumed to be 1 cm instead of 3 cm as listed. The mass above the orbit is the frontal and parietal in dorsal view.|
Comments- This specimen was discovered in 2001 and announced in an abstract by Clark et al. (2002) as a basal coelurosaur. It was later described in more detail in an abstract by Choiniere et al. (2008), who used a version of the TWG matrix and found it to be one of the most basal coelurosaurs, sister to Tugulusaurus. Choiniere et al. (2010) named and described the taxon in depth, finding it either as a non-tyrannoraptoran coelurosaur in a trichotomy with Tugulusaurus or as a non-maniraptoriform tyrannoraptoran more derived than tyrannosauroids.
References- Clark, Xu, Forster, Wang and Andres, 2002. New small dinosaurs from the Upper Jurassic Shishugou Formation at Wucaiwan, Xinjiang, China. Journal of Vertebrate Paleontology. 22(3), 44A.
Choiniere, Clark, Xu and Forster, 2008. A new basal coelurosaur from the upper Shishugou Formation (Xinjiang, People's Republic of China). Journal of Vertebrate Paleontology. 28(3), 63A.
Choiniere, Clark, Forster and Xu, 2010. A basal coelurosaur (Dinosauria: Theropoda) from the Late Jurassic (Oxfordian) of the Shishugou Formation in Wucaiwan, People's Republic of China. Journal of Vertebrate Paleontology. 30(6), 1773-1796.