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This fossil is from Guanling, Guizhou of China, of Triassic Formation. Many marine reptile fossils were found there. This one looks like a rib bone of a marine reptile?
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Hi all, I recently obtained several lovely ammonites from the late Triassic (Carnian) Xiaowa Formation of Guanling, Guizhou Province However, I lack the expertise to identify them and I was hoping you could help I suspect A is a Trachyceras multituberculatum as this ammonite type is abundant there, and that species is also the most common ammonite there I can't tell what B and C are. I am not even sure if C is a different species from A. From my research, the following species are also present there: Trachyceras cf. aon Paratrachyceras cf. hofmanni Paratrachyceras douvillei Hauerites cf. himalayanus Protrachyceras sp. Arctosirenites canadensis Arctosirenites columbianus What do you think?
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Xinpusaurus from Guanling
Crazyhen posted a topic in Is It Real? How to Recognize Fossil Fabrications
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References: F. Wu, Y. Sun, G. Xu, W. Hao, D. Jiang and Z. Sun (2011) New Saurichthyid Actinopterygian Fishes from the Anisian (Middle Triassic) of Southwestern China. Acta Palaeontologica Polonica 56(3):581-614
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This species is also known under the name T. hsui. The discussion about whether this is T. hsui or T. caudex seems to be still going on. Diagnosis from Hagdorn et al. 2015, p. 16: "Cup cryptodicyclic with five infrabasals and five basals; basals almost completely concealed in column pit; radials with low trapezoidal exposed aboral side and outward inclined facet with strings of granules separated by grooves (fossulae); radial articular facet and all brachial articulations ligamentary (granosyzygial). Primibrachial 2 axillary, secundibrachial 2 axillary in juveniles, in adults second arm branching after indefinite number of irregularly biserial secundibrachials. In juveniles four isotomously branching arms which constitute the 20 major arms of adults. In adults, indefinite number of endotomously branching tertiary armlets; arm branching starting at outer arms of each ray. Armlets may branch again at distal axillaries with aboral inflation or spine. Arms biserial. Brachial articulations granosyzygial with strings of granules separated by fossulae opening at equidistant circular pores along aboral sutures. Arms pinnulate after second branching. First pinnular shorter than second, with muscular articulation to brachial. Proximal and medial pinnulars with serrated margins, distal pinnulars with blade-shaped spines. Tegmen with polygonal plates, anal tube short with polygonal, aborally inflated plates around anal opening. Functional cup enlarged by means of tegminal plates extending between proximal arms, forming polygonal interbrachials and five large rhomboidal interradials inserting between interradial sutures. Interradials already present in juveniles of less than 10 mm crown height. No mouth visible; small perforated tegminal platelets at the base of free arms. Column long to very long, proximally with distinct nodals, noditaxes with up to four series of internodals. Nodals without cirri. Columnals low, circular to elliptical, granosyzygial, with multiradiate rows of granules that may be arranged as sets of chevrons; number of granule rows increasing toward the margin by bifurcation and intercalation. Intercolumnal grooves (fossulae) between granule rows with equidistant circular pore openings leading to sets of channels (tubuli) running through proximal and medial column; set of five primary tubuli surrounding lumen of central canal. Terminal column with extremely low columnals with articulated anastomosing radicular cirri, articulate facets of cirrals multiradiate." Identified by oilshale. References: Xiaofeng, W., Hagdorn, H. & Chuanshang, W. (2006 09 12) Pseudoplanktonic lifestyle of the Triassic crinoid Traumatocrinus from Southwest China. Lethaia , Vol. 39, pp. 187-193. Oslo. ISSN 0024-1164. Wang et al,. (2003) Restudy of the crinoids Traumatocrinus of the Guanling biota Guizhou. Geological Bulletin of China Vol. 22 No. 4, p. 248-253. Hagdorn, Hans; Wang, Xiao-Feng (2015). The pseudoplanktonic crinoid Traumatocrinus from the Late Triassic of Southwest China — Morphology, ontogeny, and taphonomy. Palaeoworld, (), S1871174X15000414–. doi:10.1016/j.palwor.2015.05.006
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From the album: Invertebrates
Traumatocrinus caudex Dittmar, 1866 Late Triassic Carnian Xiaowa Formation Guanling Guizhou PRC