[Paleontology • 2017] Matheronodon provincialis • Extreme Tooth Enlargement in A New Late Cretaceous Rhabdodontid Dinosaur from Southern France ---ScRaBBlE

  Matheronodon provincialis 

Godefroit, Garcia, Gomez, Stein, Cincotta,  Lefèvre & Valentin, 2017

reconstruction: L. Panzarin

 DOI: 10.1038/s41598-017-13160-2 

Abstract
Rhabdodontidae is a successful clade of ornithopod dinosaurs, characteristic of Late Cretaceous continental faunas in Europe. A new rhabdodontid from the late Campanian, of southern France, Matheronodon provincialis gen. et sp. nov., is characterized by the extreme enlargement of both its maxillary and dentary teeth, correlated to a drastic reduction in the number of maxillary teeth (4 per generation in MMS/VBN-02-102). The interalveolar septa on the maxilla are alternately present or resorbed ventrally so as to be able to lodge such enlarged teeth. The rhabdodontid dentition and masticatory apparatus were adapted for producing a strict and powerful shearing action, resembling a pair of scissors. With their relatively simple dentition, contrasting with the sophisticated dental batteries in contemporary hadrosaurids, Matheronodon and other rhabdodontids are tentatively interpreted as specialized consumers of tough plant parts rich in sclerenchyma fibers, such as Sabalites and Pandanites.

Figure 1 Right maxilla of Matheronodon provincialis gen. et sp. nov. (MMS/VBN-02–102; holotype) in dorsal (a), lateral (b), medial (c), and ventral (d) views. (e) Close-up of the second and third maxillary crowns.

Figure 2 Reconstruction of the maxillary dentition of  Matheronodon provincialis gen. et sp. nov. in lateral view from CT scans of MMS/VBN-02-102.

Ornithischia Seeley, 1887

Ornithopoda Marsh, 1881

Iguanodontia Sereno, 1986

Rhabdodontidae Weishampel, Jianu, Csiki, and Norman, 2003

Matheronodon provincialis gen. et sp. nov.

Etymology. Matheron: in honor of Philippe Matheron, who was the first to describe dinosaur remains in Provence; odous (Greek): tooth; provincialis (Latin): from Provence (southern France).

Holotype. MMS/VBN-02-102, a right maxilla; housed in the collections of the Musée du Moulin seigneurial (MMS, Velaux, France).

Horizon and locality. ‘Begudian’ (local stage) sandstones, late Campanian, Late Cretaceous6,8. Velaux-La Bastide Neuve, Aix-en-Provence Basin, Bouches-du-Rhône, southern France.

Diagnosis. Rhabdodontid ornithopod characterized by the following autapomorphies: enlargement of both maxillary and dentary teeth (up to 5 cm in mesio-distal length); reduction of maxillary tooth families (4 per generation in MMS/VBN-02-102); interalveolar septa on the maxilla alternately present or resorbed ventrally, so that one functional tooth is lodged in two paired alveoli; shortened rostral process on the maxilla; broad dorsal shelf along the rostral third of the maxilla; more than 25 vertical and parallel ridges on the labial side of the maxillary teeth.

Figure 3 Isolated teeth of  Matheronodon provincialis gen. et sp. nov.  Left maxillary tooth (MMS/VBN- 09–149a) in labial (a) and lingual (b) views. Right maxillary crown (MMS/VBN-12-22) in labial (c) and lingual (d) views? Right dentary tooth (MMS/VBN-02-11) in lingual (e) and labial (f) views? Left dentary tooth (MMS/VBN-12-A002) in lingual view (g). Scale bars = 2 cm.

Pascal Godefroit, Géraldine Garcia, Bernard Gomez, Koen Stein, Aude Cincotta, Ulysse Lefèvre and Xavier Valentin. 2017. Extreme Tooth Enlargement in A New Late Cretaceous Rhabdodontid Dinosaur from Southern France. Scientific Reports. 7, Article number: 13098.  DOI: 10.1038/s41598-017-13160-2

 naturalsciences.be/en/news/item/9102 

    

---------------------------------------------------------------

روابط التحميل والمشاهدة، الروابط المباشرة للتحميل

من هنا

او

من هنا

شاهد هذا الفيديو القصير لطريقة التحميل البسيطة

منتدى مدونات بلوجر جاهزة بآلاف المواضيع والمشاركات

كيف تحصل على مدونة جاهزة بآلاف المواضيع والمشاركات من هنا

شاهد قناة منتدى مدونات بلوجر جاهزة بألاف المواضيع والمشاركات على اليوتيوب لمزيد من الشرح من هنا

رابط مدونة منتدى مدونات بلوجر جاهزة بآلاف المواضيع والمشاركات في أي وقت حــــتى لو تم حذفها من هنا
شاهد صفحة منتدى مدونات بلوجر جاهزة بألاف المواضيع والمشاركات على الفيس بوك لمزيد من الشرح من هنا

تعرف على ترتيب مواضيع منتدى مدونات بلوجر جاهزة بآلاف المواضيع والمشاركات (حتى لا تختلط عليك الامور) من هنا

ملاحظة هامة: كل عمليات تنزيل، رفع، وتعديل المواضيع الجاهزة تتم بطريقة آلية، ونعتذر عن اي موضوع مخالف او مخل بالحياء مرفوع بالمدونات الجاهزة بآلاف المواضيع والمشاركات، ولكم ان تقوموا بحذف هذه المواضيع والمشاركات والطريقة بسيطة وسهلة. ــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــسلامـ.

[Paleontology • 2018] Bayannurosaurus perfectus • A Large-sized Basal Ankylopollexian from East Asia, Shedding Light on early Biogeographic History of Iguanodontia ---ScRaBBlE

Bayannurosaurus perfectus 

 Xu, Tan, Gao, Bao, Yin, Guo, Wang, Tan, Zhang & Xing, 2018

  DOI:  10.1016/j.scib.2018.03.016 

Abstract

A presumably mostly quadrupedal ankylopollexian iguanodontian, Bayannurosaurus perfectus gen. et sp. nov., is reported here, and is represented by an excellently well-preserved skeleton from the Lower Cretaceous Bayingebi Formation of Inner Mongolia, China. The diagnosis of the taxon includes several autapomorphies, notably a dorsally directed, strap-like posterodorsal process of the jugal and a horizontally oriented preacetabular process of the ilium. The nearly complete caudal series retains eight posterior-most caudals with procoelous, trapezoidal centra in dorsal view, and the last three caudals are fully fused. The discovery of B. perfectus opens a critical new window on the early evolution and intercontinental dispersal of Iguanodontia. The skeleton displays a transitional morphology between non-hadrosauriform ankylopollexians and Hadrosauriformes. A phylogenetic analysis indicates that Bayannurosaurus is positioned higher on the tree than Hypselospinus, but below Ouranosaurus just outside of Hadrosauriformes. The tree topology of Iguanodontia with temporal and spatial constraints reveals a possible biogeographic scenario supported by the statistical dispersal-vicariance analysis: around the J/K boundary, non-hadrosauriform ankylopollexians experienced multiple dispersal events from Europe to Asia, accompanying the coeval fall of the global sea level.

Keywords: Non-hadrosauriform ankylopollexian; Lower Cretaceous; Bayingebi Formation; Inner Mongolia; Intercontinental dispersal

Fig. 1. Locality and horizon of the holotype (IMMNH PV00001) of Bayannurosaurus perfectus gen. et sp. nov.. (a) Fossil site at the quarry indicated by a white arrow. (b) Chulumiao locality in southwestern Inner Mongolia (China), where the holotype of B. perfectus was collected. (c) Stratigraphic distribution of B. perfectus within the upper Bayingebi Formation. (d) Holotype of B. perfectus originally exposed at the quarry.

Systematic palaeontology

Ornithischia Seeley, 1887

Ornithopoda Marsh, 1881

Iguanodontia Dollo, 1888 sensu Sereno, 1998

Ankylopollexia Sereno, 1986 sensu Sereno, 1998

Bayannurosaurus perfectus gen. et sp. nov.

 Etymology: ‘Bayannur’, the name of the general geographic area where the fossil was retrieved; ‘saurus’, based on the Greek word ‘sauros’ for lizard. ‘perfectus’, in reference to the perfect preservation of the skeleton designated as the holotypic specimen.

Holotype: IMMNH PV00001 (housed at the Inner Mongolia Museum of Natural History, Hohhot, Inner Mongolia), a nearly complete, semi-articulated skeleton, including the entire caudal series.

 Locality and horizon: Chulumiao, ∼7 km north of Chaogewenduer Town, Urad Rear Banner, Bayannur, Inner Mongolia (Fig. 1b); middle part of the upper half of the Bayingebi Formation (Fig. 1c); Early Cretaceous (early Aptian).

Xing Xu, Qingwei Tan, Yilong Gao, Zhiqiang Bao, Zhigang Yin, Bin Guo, Junyou Wang, Lin Tan, Yuguang Zhang and Hai Xing. 2018. A Large-sized Basal Ankylopollexian from East Asia, Shedding Light on early Biogeographic History of Iguanodontia. Science Bulletin.  63(9); 556-563. DOI:  10.1016/j.scib.2018.03.016

Researchgate.net/publication/324488089_A_large-sized_basal_ankylopollexian_from_East_Asia 

Iguanodontia is among the first-discovered dinosaurian groups in the world, and has become one of the best studied ornithischian clades, which refers to its taxonomic, phylogenetic and ontogenetic significance for dinosaurian evolution. Ankylopollexia represents a relatively derived iguanodontian clade that displays large body size and many highly modified features for more efficient herbivory and locomotion. Although relevant studies on European and North American material enhanced our knowledge of the early evolution of Ankylopollexia, the extreme scarcity of non-hadrosauriform ankylopollexians in Asia had long hindered attempts to comprehensively elucidate evolutionary history and related issues of the global iguanodontians. The research team led by Dr. Xing Xu names and describes a new non-hadrosauriform ankylopollexian Bayannurosaurus perfectus represented by an excellently wellpreserved skeleton, from the Lower Cretaceous Bayingebi Formation, western Inner Mongolia, China. The discovery of this new taxon is very helpful in understanding the origin and early evolution of Hadrosauriformes, optimizing the phylogenetic framework of non-hadrosaurid iguanodontians and clarifying the global biogeographic history of Iguanodontia around the Jurassic–Cretaceous boundary (see the article by Xing Xu et al. on page 556).

---------------------------------------------------------------

روابط التحميل والمشاهدة، الروابط المباشرة للتحميل

من هنا

او

من هنا

شاهد هذا الفيديو القصير لطريقة التحميل البسيطة

منتدى مدونات بلوجر جاهزة بآلاف المواضيع والمشاركات

كيف تحصل على مدونة جاهزة بآلاف المواضيع والمشاركات من هنا

شاهد قناة منتدى مدونات بلوجر جاهزة بألاف المواضيع والمشاركات على اليوتيوب لمزيد من الشرح من هنا

رابط مدونة منتدى مدونات بلوجر جاهزة بآلاف المواضيع والمشاركات في أي وقت حــــتى لو تم حذفها من هنا
شاهد صفحة منتدى مدونات بلوجر جاهزة بألاف المواضيع والمشاركات على الفيس بوك لمزيد من الشرح من هنا

تعرف على ترتيب مواضيع منتدى مدونات بلوجر جاهزة بآلاف المواضيع والمشاركات (حتى لا تختلط عليك الامور) من هنا

ملاحظة هامة: كل عمليات تنزيل، رفع، وتعديل المواضيع الجاهزة تتم بطريقة آلية، ونعتذر عن اي موضوع مخالف او مخل بالحياء مرفوع بالمدونات الجاهزة بآلاف المواضيع والمشاركات، ولكم ان تقوموا بحذف هذه المواضيع والمشاركات والطريقة بسيطة وسهلة. ــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــسلامـ.