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Showing results for tags 'middle triassic'.
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A new paper is available online: Kammerer, Christian F.; Nesbitt, Sterling J.; Flynn, John J.; Ranivoharimanana, Lovasoa; Wyss, André R., 2020. A tiny ornithodiran archosaur from the Triassic of Madagascar and the role of miniaturization in dinosaur and pterosaur ancestry. Proceedings of the National Academy of Sciences doi:10.1073/pnas.1916631117. ISSN 0027-8424. Until now, the fossil record of Triassic diapsids from Madagascar was pretty poor, and after the putative 'prosauropod' from the Isalo II unit (later named Azendohsaurus madagaskarensis) was found to be a non-archosauriform archosauromorph (like the Azendohsaurus type species), avemetatarsalians remained absent from the published Isalo II diapsid fossil record, but Kongonaphon, along with an unnamed silesaurid and an unnamed basal avemetatarsalian (reported at the SVP 2019 meeting), demonstrates that early bird-line archosaurs were widespread in Gondwana during the Anisian-Ladinian.
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New specimen of Triassurus and the early evolution of salamanders
DD1991 posted a topic in Fossil News
A new exciting paper regarding early lissamphibian evolution is available online: Rainer R. Schoch; Ralf Werneburg; Sebastian Voigt (2020). A Triassic stem-salamander from Kyrgyzstan and the origin of salamanders. Proceedings of the National Academy of Sciences of the United States of America 117. doi:10.1073/pnas.2001424117. https://www.pnas.org/content/early/2020/05/05/2001424117 For a long time, a bonafide salamander from the Triassic remained elusive in the fossil record, although the recent description of Chinlestegophis has helped shed light on early caecilian evolution. Triassurus had been assigned to Caudata by Ivakhnenko (1978), but Estes (1981) questioned this placement and viewed it as a larval temnospondyl, while Milner (1994, 2000) noted that Triassurus has a suite of traits that distinguish it from Jurassic salamanders. Now, however, the paper by Schoch et al. confirms the initial placement of Triassurus as a member of Caudata, effectively making that genus the earliest bonafide salamander and filling another gap in the fossil record of early lissamphibians. Additionally, the new specimen of Triassurus happens to further confirm the temnospondyl origin of lissamphibians by sharing physical features with branchiosaurids and amphibamiforms.-
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A new paper is available online that will shock you: Agnolin, F.L., and Ezcurra, M.D., 2019. The validity of Lagosuchus talampayensis Romer, 1971 (Archosauria, Dinosauriformes), from the Late Triassic of Argentina. Breviora, 565(1), 1-21. https://bioone.org/journals/Breviora/volume-565/issue-1/0006-9698-565.1.1/THE-VALIDITY-OF-LAGOSUCHUS-TALAMPAYENSIS-ROMER-1971-ARCHOSAURIA-DINOSAURIFORMES-FROM/10.3099/0006-9698-565.1.1.short?tab=ArticleLink The paper by Agnolin and Ezcurra revalidating Lagosuchus talampayensis as distinct from other non-dinosaurian dinosauromorphs and sinking Marasuchus as a junior synonym of Lagosuchus provides new insights into the anatomy of UPLR 09 (L. talampayensis) as it compares with other dinosauriforms, considering that Sereno and Arcucci (1994) did not consider UPLR 09 to be diagnostic from other basal dinosauromorphs. By the way, does anyone have a copy of the above paper I could look at?
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Hi, Does anyone have a copy of the following paper: S. G. Lucas and S. K. Harris. 1996. Taxonomic and biochronological significance of specimens of the Triassic dicynodont Dinodontosaurus Romer 1943 in the Tübingen collection. Palaeontologische Zeitschrift 70:603-622. I just wanted to have a look at this paper.
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I prepared this small vertebra, width about 15 mm. The vertebra is upside down in the matrix and I think the centrum is missing. It is found in Winterswijk, Netherlands. It is from the Musschelkalk rock formation from the Middle Triassic.
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While collecting fossilized raindrop impressions such as this one from a sandstone block. I also found these unusual impressions. Rhynchosaur fossils and trace fossils are known at this location. So was wondering if anyone could see the possibility of a rhynchosaur making these marks. Or perhaps they are some other kind of middle triassic fauna or flora markings. The stratigraphy is the tarporley siltstone, lower anisian ( middle triassic) UK.
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From the album MY FOSSIL Collection - Dpaul7
Keichousaurus Fossil Guizhou Xingyi China Middle Triassic (~210 million years ago) Keichousaurus is a genus of marine reptile in the pachypleurosaur family which went extinct at the close of the Triassic in the Triassic-Jurassic extinction event. The name derives from Kweichow (now Guizhou Province) in China where the first fossil specimen was discovered in 1957. They are among the most common sauropterygian fossils recovered and are often found as nearly complete, articulated skeletons, making them popular among collectors. Keichousaurus, and the pachypleurosaur family broadly, are sometimes classified within Nothosauroidea, but are otherwise listed as a separate, more primitive lineage within Sauropterygia. Keichousaurus, like all sauropterygians, was highly adapted to the aquatic environment. Individuals of this genus ranged up to 2.7 m in length, and had both long necks and long tails, with elongated, five-toed feet. The pointed head and sharp teeth in this genus also indicate that they were fish-eaters. Some recovered specimens feature an especially developed ulna suggesting they may have spent some time on land or in marshes. In addition fossil evidence suggest also a pair of fossilized pregnant marine reptiles called Keichousaurus hui, show they had a mobile pelvis to give birth to live young rather than laying eggs. Kingdom: Animalia Phylum: Chordata Class: Reptilia Superorder: †Sauropterygia Order: †Nothosauroidea Family: †Keichousauridae Genus: †Keichousaurus -
From the album MY FOSSIL Collection - Dpaul7
Keichousaurus Fossil Guizhou Xingyi China Middle Triassic (~210 million years ago) Keichousaurus is a genus of marine reptile in the pachypleurosaur family which went extinct at the close of the Triassic in the Triassic-Jurassic extinction event. The name derives from Kweichow (now Guizhou Province) in China where the first fossil specimen was discovered in 1957. They are among the most common sauropterygian fossils recovered and are often found as nearly complete, articulated skeletons, making them popular among collectors. Keichousaurus, and the pachypleurosaur family broadly, are sometimes classified within Nothosauroidea, but are otherwise listed as a separate, more primitive lineage within Sauropterygia. Keichousaurus, like all sauropterygians, was highly adapted to the aquatic environment. Individuals of this genus ranged up to 2.7 m in length, and had both long necks and long tails, with elongated, five-toed feet. The pointed head and sharp teeth in this genus also indicate that they were fish-eaters. Some recovered specimens feature an especially developed ulna suggesting they may have spent some time on land or in marshes. In addition fossil evidence suggest also a pair of fossilized pregnant marine reptiles called Keichousaurus hui, show they had a mobile pelvis to give birth to live young rather than laying eggs. Kingdom: Animalia Phylum: Chordata Class: Reptilia Superorder: †Sauropterygia Order: †Nothosauroidea Family: †Keichousauridae Genus: †Keichousaurus -
A new article regarding a new fossil turtle: http://newsdesk.si.edu/releases/smithsonian-scientist-and-collaborator-discover-key-link-turtle-evolution It's no surprise that we have been looking for a missing link reptile that would provide morphological evidence to support DNA analyses linking turtles with lepidosaurs and archosaurs rather than pareiasaurs, and Pappochelys fills a gap in the fossil record by pushing the origin of turtles back 240 million years ago.
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A new paper for anyone interested in the early evolution of lepidosaurs: Marc E.H. Jones, Cajsa Lisa Anderson, Christy A. Hipsley, Johannes Müller, Susan E. Evans and Rainer R. Schoch, 2013 Integration of molecules and new fossils supports a Triassic origin for Lepidosauria (lizards, snakes, and tuatara). BMC Evolutionary Biology 2013, 13:208 doi:10.1186/1471-2148-13-208 http://www.biomedcentral.com/1471-2148/13/208/abstract The rhynchocephalian jaw bone from Germany points to the first appearance of lepidosaurs in the Early-Middle Triassic, making Diphydontosaurus the second oldest lepidosaur known to science. This discovery also highlights a huge deficit in the knowledge of early lepidosaurs (the putative Triassic squamate Tikiguana was thought to be of Triassic age, but a recent analysis places it as an agamid, meaning that the only known fossil of Tikiguana was actually reworked from late Cenozoic deposits into Triassic deposits judging from its preservation and hence Tikiguana is not from the Triassic, but instead from the Cenozoic). We've got some Triassic squamate hunt to do. Maybe there are some enigmatic diapsids from the Early-Middle Triassic that could be closely related to modern squamates and tuataras.
