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[dinosaur] Stegosaur pelvic girdle evolution in Sichuan Basin

Ben Creisler

A recent paper in Chinese not yet mentioned. For now, I can't find a pdf link that is free or in open access, so the links below require a login.

HAO Baoqiao, PENG Guangzhao, QIN Gang, YE Yong &Â JIANG Shan (2018)
Evolution of Pelvic Girdles of Stegosaurs in the Sichuan Basin.
Acta Geologica Sichuan 133(1): 62-64 + 69


(A very quick, rough translation of the abstract modified from Google translate...)

The Sichuan Basin is a concentrated area of ââChinese stegosaur dinosaur fossils, including the 6 genera Huayangosaurus, Tuojiangosaurus, Gigantspinosaurus, Chungkingosaurus, Chialingosaurus, and Yingshanosaurus. In addition to Chialingosaurus, the other 5 genera have pelvic girdle preservation. Stegosaur pelvic girdles are another important identification feature in addition to bone plates. The five genera are distributed in four successive fossil layers, forming a continuous growth line of the Jurassic stegosaurs in the Sichuan Basin. The characteristics of the stegosaurian pelvic girdle are mainly reflected in the shape of the sacrum, ischial bone, and pubic bone. According to its characteristics, the evolutionary relationship of stegosaurs from the primitive type to the progressive type can be found. The Sichuan Basin stegosaurs have an evolutionary process from Huayangosaurus-Chungkingosaurus-Gigantspinosaurus to Tuojiangosaurus-Yingshanosaurus. Huayangosaurus taibaii is the most primitive stegosaur, and Gigantspinosaurus inherits some of the original characteristics. But it is more advanced than Huayangosaurus. Gigantspinosaurus should be a transitional type between Huayangosaurus and Tuojiangosaurus, and it is closer to Tuojiangosaurus. Yingshanosaurus is located at the top of stegosaur evolution in the Sichuan Basin.