Temat: plesiosaur - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A new plesiosauroid from the Toarcian (Lower Jurassic) of Alhadas, Portugal
Autorzy:: Smith, A.S.
Araujo, R.
Mateus, O.
Powiązania:: https://bibliotekanauki.pl/articles/22142.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: new plesiosauroid
plesiosauroid
Toarcian
Lower Jurassic
Jurassic
paleontology
Alhadas
Portugal
Elasmosauridae
Plesiosauridae
Plesiosauria
Lusonectes sauvagei
plesiosaur
Lusitanian basin
Opis:: A partial plesiosauroid skull from the São Gião Formation (Toarcian, Lower Jurassic) of Alhadas, Portugal is re−evaluated and described as a new taxon, Lusonectes sauvagei gen. et sp. nov. It has a single autapomorphy, a broad triangular parasphenoid cultriform process that is as long as the posterior interpterygoid vacuities, and also a unique character combination, including a jugal that contacts the orbital margin, a distinct parasphenoid–basisphenoid suture exposed between the posterior interpterygoid vacuities, lack of an anterior interpterygoid vacuity, and striations on the ventral surface of the pterygoids. Phylogenetic analysis of Jurassic plesiosauroids places Lusonectes as outgroup to “microcleidid elasmosaurs”, equivalent to the clade Plesiosauridae. Lusonectes sauvagei is the only diagnostic plesiosaur from Portugal, and the westernmost occurrence of any plesiosaurian in Europe.
Źródło:: Acta Palaeontologica Polonica; 2012, 57, 2
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Youngest occurrences of rhomaleosaurid plesiosaurs indicate survival of an archaic marine reptile clade at high palaeolatitudes
Autorzy:: Benson, R.B.J.
Zverkov, N.G.
Arkhangelsky, M.S.
Powiązania:: https://bibliotekanauki.pl/articles/21817.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Plesiosauria
Rhomaleosauridae
biogeography
Jurassic
Callovian
occurrence
rhomaleosaurid plesiosaur
survival
marine reptile
paleontology
United Kingdom
Russia
Opis:: Rhomaleosaurid plesiosaurians were a common and ecologically significant component of Early Jurassic marine faunas, primarily as large-bodied predators. They declined in abundance and made their last fossil appearance in the Middle Jurassic. However, the geographic pattern of rhomaleosaurid extinction has thus far been obscured by spatial bias in the Middle Jurassic marine reptile fossil record, which is strongly focussed on low-latitude European assemblages. We report two rhomaleosaurid specimens from the Callovian (late Middle Jurassic) of the UK and Russia. Along with Borealonectes from Arctic Canada, these are the youngest-known occurrences of rhomaleosaurids. The UK specimen is the first identified from the Callovian of Europe, despite intensive fossil sampling over almost 200 years and the recovery of hundreds of other plesiosaurian specimens. Its discovery indicates that rhomaleosaurids were present, but extremely rare, at low palaeolatitudes of the Callovian. The Russian specimen is one of relatively few marine reptile specimens from its mid-palaeolatitude assemblage, as is also true of Borealonectes, which occurs in a high-palaeolatitude marine assemblage. Furthermore, we suggest that a mid latitude southern hemisphere occurrence from the Callovian of Argentina, previously referred to Pliosauridae, in fact represents a rhomaleosaurid. These findings suggest that rhomaleosaurids were actually common elements of mid-high palaeolatitude marine faunas, indicating a geographically staggered pattern of declining rhomaleosaurid abundance, and demonstrating the apparent persistence of an archaic marine reptile group in cool, mid-high latitude environments of the Middle Jurassic. It is therefore possible that sustained Middle-Late Jurassic global warming accelerated the ultimate extinction of rho-maleosaurids. Our findings suggest that widening the geographical breadth of fossil exploration could considerably enhance current knowledge of Jurassic marine reptile evolution.
Źródło:: Acta Palaeontologica Polonica; 2015, 60, 4
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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