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Zhang F.,Chongqing Museum of Natural History

Multivariate analysis, which has often been used effectively in paleontological work, was performed on 17 specimens of Plasmoporella collected from a bed of the Xiazhen Formation in the Zhuzhai section of Yushan area, China. Frequency histograms, simple correlation analysis, and principal component analysis (PCA) showed that five morphological characters, i.e., diameter of tabularium (DC), distance between neighboring septa (DNS), distance between opposite septa (DOS), distance between corallites (DBC), and number of corallites per cm2 (N) were suitable for cluster analysis. Moreover, PCA suggested that the coralla could be divided into two groups. Cluster analysis with squared Euclidean distances calculated based on the selected five morphological characters was conducted on the raw matrix to discriminate "morphospecies". As a result, two groups were extracted in the dendrogram. The validity or distinctiveness of the groups was tested by discriminant analysis (DA). The analysis confirmed that the assemblage of coralla can be divided successfully into two groups, which are interpreted as two morphospecies. A qualitative comparison between two reported species and the studied morphospecies showed that morphospecies A is Plasmoporella shiyanshanensisLin and Chow, 1977 and B is Plasmoporella kasachstanicaBondarenko, 1958. In addition, DA indicated that DOS and DNS were effective to distinguish the two morphospecies. Bivariate plots based on the two morphospecies were used to illustrate the range of variation, which showed that intraspecific variation in these characters was obvious but interspecific variation was not. © 2015 Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. Source

Lang S.-Y.,Chongqing Museum of Natural History | Bozano G.C.,Viale Romagna 76

A new species, Chonala huertasae Lang & Bozano sp. nov., is described from Dulong-jiang valley, West slope of Mts. Gao-li-gong, NW Yunnan Province, SW China. A key to species and subspecies of the genus Chonala is given. © 2016 Magnolia Press. Source

Tong H.,CAS Institute of Vertebrate Paleontology and Paleoanthropology | Danilov I.,Russian Academy of Sciences | Ye Y.,Zigong Dinosaur Museum | Ouyang H.,Chongqing Museum of Natural History | And 2 more authors.
Annales de Paleontologie

The type specimens of the Jurassic turtles from the Sichuan Basin (China) previously referred to plesiochelyid Plesiochelys are revised, which confirm that they belong to the family Xinjiangchelyidae. The study of a large number of additional shell material shows, as the dominant group, the Xinjiangchelyidae were greatly diversified in the Late Jurassic of the Sichuan Basin. By the absence of mesoplastron and other shell characters, Chengyuchelys baenoides is moved to Xinjiangchelyidae and considered as a valid taxon. Of the xinjiangchelyids from the Late Jurassic of Sichuan Basin, four genera are recognized: Chengyuchelys, Tienfuchelys, Yanduchelys and cf. Protoxinjiangchelys. The phylogenetic analysis results in that Chengyuchelys includes C. baenoides, C. latimarginalis and C. radiplicatus, and Tienfuchelys consists of T. tzuyangensis, T. chungkingensis and T. zigongensis. All xinjiangchelyids from the Sichuan Basin are more primitive than Xinjiangchelys in the plastron sutured to the carapace. © 2012 Elsevier Masson SAS. Source

Tong H.,Institute of Vertebrate Palaeontology and Palaeoanthropology | Danilov I.,Russian Academy of Sciences | Ye Y.,Zigong Dinosaur Museum | Ouyang H.,Chongqing Museum of Natural History | Peng G.,Zigong Dinosaur Museum
Geological Magazine

The turtle fauna of the Middle Jurassic Xiashaximiao Formation in the Sichuan Basin and the type series of Chengyuchelys baenoides Young & Chow, 1953 are revised. By the absence of a mesoplastron and other shell characters, both the holotype and paratype of Chengyuchelys baenoides belong to the family Xinjiangchelyidae and come probably from the Upper Jurassic Shangshaximiao Formation. The Middle Jurassic turtle assemblage of the Sichuan Basin is composed of two entities: the Bashuchelyidae fam. nov. (Bashuchelys gen. nov., Chuannanchelys gen. nov.) and Protoxinjiangchelys gen. nov. on the one hand, and Sichuanchelys on the other hand, with the former as the dominant group. Bashuchelyids and xinjiangchelyids are closely related to one another, while Sichuanchelys is more primitive and has no shared apomorphic features with bashuchelyids. The whole assemblage appears to be endemic to the Sichuan Basin at genus level and distinct from the Late Jurassic turtle fauna of the same basin in its relict nature and absence of the Polycryptodira. © Cambridge University Press 2011. Source

In this paper, the specific status of Lethe elwesi (Moore, 1892) stat. rev. is recovered and a new subspecies L. elwesi houjiangae Lang & Bozano ssp. nov. is described from NW Yunnan province, China. Lethe plistia Fruhstorfer, 1911 is still regarded as a subspecies of L. jalaurida (de Nicéville, 1880). © 2015 Magnolia Press. Source

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