[Paleontology • 2018] Caihong juji • A Bony-crested Jurassic Dinosaur with Evidence of Iridescent Plumage highlights Complexity in Early Paravian Evolution ---ScRaBBlE

Caihong juji 

Hu, Clarke, Eliason, Qiu, Li, Shawkey, Zhao, D’Alba, Jiang & Xu, 2018

  DOI:   10.1038/s41467-017-02515-y  
Illustration: Velizar Simeonovski

Abstract

The Jurassic Yanliao theropods have offered rare glimpses of the early paravian evolution and particularly of bird origins, but, with the exception of the bizarre scansoriopterygids, they have shown similar skeletal and integumentary morphologies. Here we report a distinctive new Yanliao theropod species bearing prominent lacrimal crests, bony ornaments previously known from more basal theropods. It shows longer arm and leg feathers than Anchiornis and tail feathers with asymmetrical vanes forming a tail surface area even larger than that in Archaeopteryx. Nanostructures, interpreted as melanosomes, are morphologically similar to organized, platelet-shaped organelles that produce bright iridescent colours in extant birds. The new species indicates the presence of bony ornaments, feather colour and flight-related features consistent with proposed rapid character evolution and significant diversity in signalling and locomotor strategies near bird origins.

Caihong juji  prepares to snatch its prey.

Illustration: Zhao Chuang

Fig. 1 Caihong juji holotype specimen (PMoL-B00175).
 Photographs of the slab (a) and counter slab (b) and line drawing (c) of the specimen based on both slabs. Photograph (d) and line drawing (e) of a composite of the rostrum of the skull and mandible exposed on the counter slab and the post-rostrum cranium exposed on the slab. Arrows indicate lacrimal crests. Question mark indicates uncertain identification. Scale bars: 10 cm a–c, 1 cm d and e.

 aof antorbital fenestra, cav caudal vertebra, cev cervical vertebra, dr dorsal rib, dv dorsal vertebra, ect ectopterygoid, emf external mandibular fenestra, en external naris, f feather, fu furcula, ga gastralia, hy hyoid, il ilium, is ischium, la left angular, lar left articular, lc left coracoid, lcr lacrimal crest, ld left dentary, lf left, frontal, lfe left femur, lh left humerus, lj left jugal, ll left lacrimal, lma left maxilla, lm left manus, ln left nasal, lp left pes, lpa left palatine, lpo left postorbital, lq left quadrate, lqj left quadratojugal, lr left radius, ls left scapula, lsp left splenial, lsa left surangular, lsq left squamosal, lt left tibiotarsus, lu left ulna, ma mandible, mf maxillary fenestra, o orbit, p parietal, pm premaxilla, pt pterygoid, pu pubis, rar right articular, rc right coracoid, rd right dentary, rfe right femur, rh right humerus, rm right manus, rp right pes, rpra right prearticular, rq right quadrate, rr right radius, rs right scapula, rt right tibiotarsus, ru right ulna, scl sclerotic bones, sk skull, sy synsacrum

Systematic palaeontology

Theropoda Marsh, 1881

Maniraptora Gauthier, 1986

Paraves Sereno, 1998

Caihong juji gen. et sp. nov.

 Etymology. Caihong is from the Mandarin ‘Caihong’ (rainbow), referring to the beautiful preservation of the holotype specimen of the animal and the array of insights it offers into paravian evolution; juji is from the Mandarin ‘ju’ (big) and ‘ji’ (crest), referring to the animal’s prominent lacrimal crests.

 Holotype. PMoL-B00175 (Paleontological Museum of Liaoning), a nearly complete skeleton with associated plumage preserved on a slab and counter slab from Gangou, Qinglong, northern Hebei Province, Tiaojishan Formation, early Late Jurassic, ~161 Myr.

 Diagnosis. A small theropod with the following autapomorphies within Paraves: accessory fenestra posteroventral to promaxillary fenestra, lacrimal with prominent dorsolaterally oriented crests, robust dentary with anterior tip dorsoventrally deeper than its midsection and short ilium (<50% of the femoral length, compared to considerably >50% in other theropods).

....

An artist's depiction of Caihong juji, a species of theropod dinosaur that lived 160 million years ago in what's now northeastern China.

Illustration: Velizar Simeonovski 

Dongyu Hu, Julia A. Clarke, Chad M. Eliason, Rui Qiu, Quanguo Li, Matthew D. Shawkey, Cuilin Zhao, Liliana D’Alba, Jinkai Jiang and Xing Xu. 2018. A Bony-crested Jurassic Dinosaur with Evidence of Iridescent Plumage highlights Complexity in Early Paravian Evolution. Nature Communications. 9, Article number: 217. DOI:   10.1038/s41467-017-02515-y

New 'Rainbow' Dinosaur May Have Sparkled Like a Hummingbird on.natgeo.com/2DyVWQR via @NatGeo
Little 'Rainbow' Dinosaur Discovered in China  shar.es/1NhEiQ via @LiveScience

  

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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 • 2017] Corythoraptor jacobsi • High Diversity of the Ganzhou Oviraptorid Fauna Increased by A New “Cassowary-like” Crested Species ---ScRaBBlE

Corythoraptor jacobsi

Lü, Li, Kundrát, Lee, Sun, Kobayashi, Shen, Teng & Liu, 2017

  DOI: 10.1038/s41598-017-05016-6 

Abstract

A new oviraptorid dinosaur from the Late Cretaceous of Ganzhou, bringing oviraptrotid diversity of this region to seven taxa, is described. It is characterized by a distinct cassowary-like crest on the skull, no pleurocoels on the centra from the second through fourth cervical vertebrae, a neck twice as long as the dorsal vertebral column and slightly longer than the forelimb (including the manus). Phylogenetic analysis recovers the new oviraptorid taxon, Corythoraptor jacobsi, as closely related to Huanansaurus from Ganzhou. Osteochronology suggests that the type specimen of Corythoraptor had not reached stationary growth stage but died while decreasing growth rates. The histology implies that it would correspond to an immature individual approximately eight years old. We hypothesize, based on the inner structure compared to that in modern cassowaries, that the prominent casque of Corythoraptor was a multifunction-structure utilized in display, communication and probably expression of the fitness during mating seasons.

Figure 1: The holotype of Corythoraptor jacobsi gen. et sp. nov. (JPM-2015-001). (a) Photograph. (b) Outline drawings. (c) Close up of the skull and lower jaw, showing the pneumatic cassowary-like crest (Only skull and lower jaw elements are labeled). (d) Skeletal reconstruction (missing parts are in grey).

 Abbreviations: aof, antorbital fenestra; cav. caudal vertebrae; cr. cervical ribs; cv. cervical vertebrae; dv. dorsal vertebrae; fe, femur; fi. fibula; h, humerus; il, ilium; is, ischium; l, lacrimal; lj, lower jaw; ltf, lower temporal fenestra; m, maxilla; n, nasal; nar, narial opening; o, orbit; oc, occipital condyle; p, parietal; pm, premaxilla; po, postorbital; ps, pes; psc, pneumatic skull crest; pu. pubis; q, quadrate; ra, radius; sk, skull; sq, squamosal; stf, super temporal fenestra; ti, tibia; ul, ulna. Scale bar = 8 cm in (c) and 100 cm in (d).

Systematic palaeontology

Oviraptorosauria Barsbold, 1976.

Oviraptoridae Barsbold, 1976.

Corythoraptor jacobsi gen. et sp. nov.

Etymology: The generic name Corythoraptor refers to a raptor bearing a “cassowary-like crest” on its head, and the specific name is in honor of Professor Louis L. Jacobs, who has contributed to dinosaur research and has given excellent mentoring to three authors (JLü, YL and YK) when they were Ph.D. students at Southern Methodist University, Dallas, Texas, USA.

Type locality and horizon: A site in the vicinity of the Ganzhou Railway Station (GPS coordinates are provided on request from the first author), Ganzhou City; Campanian-Maastrichtian; Nanxiong Formation (Upper Cretaceous).

 Diagnosis: An oviraptorosaurian dinosaur with the following unique combination of characters: ratio of the length of the tomial margin of the premaxilla to the premaxilla height (ventral to the external naris) is 1.0–1.4; inclination of the anteroventral margin of the premaxilla relative to the horizontally positioned ventral margin of the jugal posterodorsal; antorbital fossa bordered anteriorly by the maxilla; narial opening much longer than width; infratemporal fenestra dorsoventrally elongate, narrow anteroposteriorly; the supranarial process of the premaxilla bears two processes: a short posterodorsally extending process, forming the anterodorsal margin of the external nasal opening, and a long process, forming most of the anterodorsal process of the premaxilla; distinct cassowary-like helmet on the skull; long axis of the external narial opening parallel to the dorsal margin of antorbital fenestra; straight anterodorsal margin of dentary in lateral view; a deep fossa, sometimes with associated pneumatopore on lateral surface of dentary; no pleurocoels on the centra from the second through fourth cervical vertebrae; the length of the neck twice as long as the dorsal vertebral column, and slightly longer than the entire forelimb length (including the manus); less pronounced deltopectoral crest of humerus, forming an arc rather than being quadrangular; ratio of the length of the manus to the length of the humerus plus the radius between 0.50 and 0.65; the ungual of digit III less curved than other unguals; lesser trochanter (cranial trochanter) completely fused with the greater trochanter and distal ends of shafts of metatarsal II straight and metatarsal IV laterally deflected. 

Corythoraptor jacobsi gen. et sp. nov. is assigned to oviraptorid dinosaurs based on the following characters: proximal caudals with pneumatized centra; ischium with its posterior profile concave3; premaxilla pneumatized; the subantorbital portion of the maxilla inset medially; the palate extending below the cheek margin; the external naris overlapping most of the antorbital fossa rostrodorsally; the bones of the skull roof pneumatized; the pubic shaft concave cranially, the mandibular symphysis tightly sutured; the shortened preorbital region, and the toothless jaws.

.....

Figure 2: The cranial casque of Corythoraptor jacobsi and recent cassowaries. (a–c) the crested skull of Corythoraptor and head appearance restorations. (d) a close-up (see dotted rectangle in a and b) of eroded bony shell in the posterolateral casque of Corythoraptor. (e) the crested skull of the recent cassowary (Casuarius uniappendiculatus; Museum für Naturkunde in Berlin, Germany: MfN-ZMB 93274). (f) a keratinous helmet over the skull of the recent cassowary (unnumbered specimen of Casuarius casuarius from the osteological collections of ZOO Protivín, Czech Republic). (g,h) coronal cuts through the cassowary skull – (g) Casuarius casuarius MfN-ZMB 36820, (h) Casuarius casuarius: MfN-ZMB 36885 (see dotted lines in f); note transition in strut-like trabecular arrangement. (i) close-up to contact between keratinous and skeletal components of the casque in recent cassowary, unnumbered specimen of Casuarius sp. from the osteological collections of Field Museum of Natural History, Chicago, USA.

Abbreviations: cq, casque; cr, cranium; exs, external surface; kesh, keratinous sheath; or, orbit; tr, trabeculae.

Figure 5: The living scene of Corythoraptor jacobsi gen. et sp. nov.

Drawn by Zhao Chuang

 

Junchang Lü, Guoqing Li, Martin Kundrát, Yuong-Nam Lee, Zhenyuan Sun, Yoshitsugu Kobayashi, Caizhi Shen, Fangfang Teng and Hanfeng Liu. 2017. High Diversity of the Ganzhou Oviraptorid Fauna Increased by A New “Cassowary-like” Crested Species.
  Scientific Reports. 7, Article number: 6393. DOI: 10.1038/s41598-017-05016-6

ResearchGate.net/publication/318726539_High_diversity_of_the_Ganzhou_Oviraptorid_Fauna_increased_by_a_new_cassowary-like_crested_species

Introducing Corythoraptor jacobsi.  paleonerdish.wordpress.com/2017/07/28/introducing-corythoraptor-jacobsi/ via @ferwen

Paleo Profile: The Crested Thief  blogs.scientificamerican.com/laelaps/paleo-profile-the-crested-thief/

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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 • 2017] Beibeilong sinensis • Perinate and Eggs of A Giant Caenagnathid Dinosaur from the Late Cretaceous of central China ---ScRaBBlE

 Beibeilong sinensis

Pu, Zelenitsky, Lü, Currie, Carpenter, Xu, Koppelhus, Jia, Xiao, Chuang, Li, Kundrát & Shen, 2017DOI: 10.1038/NComms14952

Abstract

The abundance of dinosaur eggs in Upper Cretaceous strata of Henan Province, China led to the collection and export of countless such fossils. One of these specimens, recently repatriated to China, is a partial clutch of large dinosaur eggs (Macroelongatoolithus) with a closely associated small theropod skeleton. Here we identify the specimen as an embryo and eggs of a new, large caenagnathid oviraptorosaur, Beibeilong sinensis. This specimen is the first known association between skeletal remains and eggs of caenagnathids. Caenagnathids and oviraptorids share similarities in their eggs and clutches, although the eggs of Beibeilong are significantly larger than those of oviraptorids and indicate an adult body size comparable to a gigantic caenagnathid. An abundance of Macroelongatoolithus eggs reported from Asia and North America contrasts with the dearth of giant caenagnathid skeletal remains. Regardless, the large caenagnathid-Macroelongatoolithus association revealed here suggests these dinosaurs were relatively common during the early Late Cretaceous.

Systematic palaeontology 

Theropoda Marsh 1881

Oviraptorosauria Barsbold 1976

Caenagnathidae Sternberg 1940

 Beibeilong sinensis gen. et sp. nov.

Figure 1: Photograph of eggs and skeleton of Beibeilong sinensis (HGM 41HIII1219).
Right image shows schematic overlay of approximate locations of individual eggs. Eggs 1 through 4 are in an upper layer just beneath the skeleton, whereas Egg 5 is in a lower layer of the block. Scale bar is in centimetre.

The fossil (left) and a digital overlay (right) shows where the eggs were placed before they broke and fossilized. Notice the skeleton of the embryo next to the ruler. 

Holotype. HGM 41HIII1219, a small, semi-articulated skeleton (‘Baby Louie’) associated with a partial nest of 6–8 eggs. The specimen is housed in the Henan Geological Museum (HGM), Zhengzhou, China.

the curled embryo of Beibelong on top of the eggs (eggshell is dark grey in color).

Photograph by Darla Zelenitsky, University of Calgary 

An illustration of Beibeilong embryo and egg fossil, with reconstruction of skeleton and fleshed-out models to the right. 

Figure 5: Reconstruction of Beibeilong embryo in ovo.
The drawing shows the approximate size of the Beibeilong embryo inside a Macroelongatoolithus egg.

drawn by Vladimir Rimbala

 Diagnosis. A large caenagnathid that has the following unique suite of features: antorbital fossa demarcated by sharply defined alveolar and dorsoposterior trending ridges, posterodorsal margin of lacrimal overlapped by frontal, subantorbital portion of the maxilla is inset medially, pronounced retroarticular process with a distinct concave posterior facet (roughly as tall at the base as it is wide), preacetabular process of the ilium longer than postacetabular process, posterior end of the postacetabular process truncated or broadly rounded, and accessory trochanter of the femur weakly developed.

 Locality and horizon. The specimen was discovered at a latitude/longitude of 33°15′30″ N, 111°43′41″ E in Heimaogou, 2 km east of Zhaoying Village, Yangcheng Township, Xixia County, Henan Province, People’s Republic of China. The locality is in the Upper Cretaceous Gaogou Formation (Cenomanian—Turonian)

Etymology. The generic name is derived from Chinese Pinyin ‘beibei’ for baby and ‘long’ for dragon. The specific name is derived from Latin referring to its discovery in China.

Beibeilong sinensis lived about 90 million years ago, during the Cretaceous period. The adults of this species were enormous, measuring up to 8 meters long from the snout to the end of the tail, and weighing up to 3,000 kilograms when fully grown at age 11.

Illustration: Zhao Chuang  

  

Hanyong Pu, Darla K. Zelenitsky, Junchang Lü, Philip J. Currie, Kenneth Carpenter, Li Xu, Eva B. Koppelhus, Songhai Jia, Le Xiao, Huali Chuang, Tianran Li, Martin Kundrát and Caizhi Shen. 2017. Perinate and Eggs of A Giant Caenagnathid Dinosaur from the Late Cretaceous of central China.  Nature Communications. 8, Article number: 14952. DOI: 10.1038/ncomms14952

First baby of a gigantic Oviraptor-like dinosaur belongs to a new species

 eurekalert.org/e/7Xft via @UCalgary @EurekAlert

'Baby Dragon' Dinosaur Found Inside Giant Egg  on.NatFeo.com/2pYHLPO via @NatGeo

Embryo of Colossal Dinosaur Was Preserved for 90 Million Years

shar.es/1FDLTy via @LiveScience

  

   

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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 • 2017] Serikornis sungei • A New Jurassic Theropod from China Documents A Transitional Step in the Macrostructure of Feathers ---ScRaBBlE

Serikornis sungei
Lefèvre, Cau, Cincotta, Hu, Chinsamy, Escuillié & Godefroit, 2017

DOI: 10.1007/s00114-017-1496-y  

 Illustration: E. Willoughby EmilyWilloughby.com

theropoda.blogspot.com

  

Abstract

Genuine fossils with exquisitely preserved plumage from the Late Jurassic and Early Cretaceous of northeastern China have recently revealed that bird-like theropod dinosaurs had long pennaceous feathers along their hindlimbs and may have used their four wings to glide or fly. Thus, it has been postulated that early bird flight might initially have involved four wings (Xu et al. Nature 421:335–340, 2003; Hu et al. Nature 461:640–643, 2009; Han et al. Nat Commun 5:4382, 2014). Here, we describe Serikornis sungei gen. et sp. nov., a new feathered theropod from the Tiaojishan Fm (Late Jurassic) of Liaoning Province, China. Its skeletal morphology suggests a ground-dwelling ecology with no flying adaptations. Our phylogenetic analysis places Serikornis, together with other Late Jurassic paravians from China, as a basal paravians, outside the Eumaniraptora clade. The tail of Serikornis is covered proximally by filaments and distally by slender rectrices. Thin symmetrical remiges lacking barbules are attached along its forelimbs and elongate hindlimb feathers extend up to its toes, suggesting that hindlimb remiges evolved in ground-dwelling maniraptorans before being co-opted to an arboreal lifestyle or flight.

Keywords: Paraves, Birds, Feathers, Barbules, Jurassic, Flight evolution

 the basal bird Serikornis sungei sp. nov. [PMOL-AB00200] from the Middle-Late Jurassic of north-eastern China. 

Fig. 1 Photograph and drawing of the basal bird Serikornis sungei sp. nov. from the Middle-Late Jurassic of north-eastern China.
 a PMOL-AB00200 photograph. b Line drawing.

 Abbreviations: cev cervical vertebrae, co coracoids, cv caudal vertebrae, fu furcula, il ilium, is ischium, lf left femur, lfi left fibula, lh left humerus, lma left manus, lpes left pes, lr left radius, ls left scapula, lt left tibia, lu left ulna, pu pubis, ra radiale, rf right femur, rh right humerus, rma right manus, rpes right pes, rr right radius, rt right tibia, ru right ulna, sk skull

Systematic palaeontology

Theropoda Marsh, 1881

Maniraptora Gauthier, 1986

Paraves Sereno, 1997; Avialae Gauthier, 1986

Serikornis sungei gen. et sp. nov.

Etymology: Serikos, ancient Greek for silk, because the body is almost covered with plumulaceous-like feathers; Ornis, ancient Greek for bird; named in honour of Sun Ge, for his contribution to our knowledge of Jurassic and Cretaceous ecosystems in Asia.

Holotype: PMOL-AB00200 is a single complete articulated skeleton with associated integumentary structures preserved on a slab. The counterpart is missing, but most of the skeleton is preserved on the main slab.

Locality and horizon: PMOL-AB00200 was collected in the Tiaojishan Formation (Oxfordian, Upper Jurassic; Chu et al. 2016) from Daxishan village, Linglongta (Jianchang County, Liaoning Province, China).

Diagnosis: Serikornis is characterized by the following combination of characters (autapomorphies are marked with an asterisk): four anterior maxillary teeth twice as long as the others regarding the crown height*; coracoid tuber well-developed and laterally projected from the lateral margin of the coracoid and forming a subglenoid shelf along the caudoventral margin of the bone; the distal end of the lateral process of the coracoid is thicker than the proximal part and forms a ventral rounded bump; ventrodistal process of ischium narrow, hook-like, strongly deflected caudodorsally and set at the distal end of the ischium*; smooth ventral side of coracoid devoid of small pits.

....

Illustration: Emily Willoughby EmilyWilloughby.com

 facebook.com/photo.php?fbid=10100308789191064 

Ulysse Lefèvre, Andrea Cau, Aude Cincotta, Dongyu Hu, Anusuya Chinsamy, François Escuillié and Pascal Godefroit. 2017. A New Jurassic Theropod from China Documents A Transitional Step in the Macrostructure of Feathers. The Science of Nature. 104:74. DOI: 10.1007/s00114-017-1496-y 

facebook.com/photo.php?fbid=10100308789191064

facebook.com/photo.php?fbid=10213490546476049

EmilyWilloughby.com/gallery/paleoart/the-silky-serikornis

theropoda.blogspot.com/2017/08/serikornis-per-gli-amici-silky.html

    

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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 • 2017] Daliansaurus liaoningensis • A New Troodontid Dinosaur from the Lower Cretaceous Yixian Formation of Liaoning Province, China ---ScRaBBlE

Daliansaurus liaoningensis 

Shen, Lü, Liu, Kundrát, Brusatte & Gao, 2017

GeoJournals.cn/dzxben

Abstract

 A new troodontid dinosaur, Daliansaurus liaoningensis gen. et sp. nov., is erected based on a nearly complete specimen from the Lower Cretaceous Yixian Formation of Beipiao City, Liaoning Province, China. This well preserved skeleton provides important new details of the anatomy for Liaoning troodontids, and gives new insight into their phylogenetic relationships and evolution. Daliansaurus is distinguished from other troodontids by an enlarged ungual on pedal digit IV, which is approximately the same size as the sickle-shaped second ungual, and is differentiated from other Liaoning troodontids by a number of characters of the skull, manus, pelvis, and hindlimb. A phylogenetic analysis recovers Daliansaurus within a subclade of Liaoning troodontids that also includes Sinovenator, Sinusonasus, and Mei. We erect a name for this group — Sinovenatorinae — and argue that it reflects a localized radiation of small-bodied troodontids in the Early Cretaceous of eastern Asia, similar to previously recognized radiations of Liaoning dromaeosaurids and avialans. As more Liaoning theropods are discovered, it is becoming apparent that small, feathered paravians were particularly diverse during the Early Cretaceous, and future work is needed to clarify how this diversity arose, which species coexisted, and how these numerous species partitioned niches. 

Key words: Troodontids, Daliansaurus liaoningensis, Early Cretaceous, Yixian Formation, Liaoning

Fig. 15. The living scene of Daliansaurus liaoningensis gen. et sp. nov. (DNHM D 2885) (drawn by Zhao Chuang)
Fig. 2. Photograph of the holotype of Daliansaurus liaoningensis gen. et sp. nov. (DNHM D2885).

Theropoda Marsh, 1881

Maniraptora Gauthier, 1986

Troodontidae Gilmore, 1924 

 Sinovenatorinae subfamily nov. 

Definition: The most inclusive clade including Sinovenator changii but not Troodon formosus, Saurornithoides mongoliensis, Anchiornis huxleyi, Archaeopteryx lithographica, Gallus gallus, Unenlagia comahuensis, or Dromaeosaurus albertensis. 

  Diagnosis: Based on our phylogenetic analysis, this clade can be diagnosed with the following combination of characters (for further discussion, see below): a premaxilla whose anteroposterior length is less than 10% of the length of the maxilla along the ventral margin of the upper jaw; a premaxillary maxillary process that contacts the nasal ventral to the external naris; some maxillary and dentary teeth that lack serrations on the mesial carina; unfused zygapophyses on the sacral vertebrae; an antitrochanter that is posterodorsal to the acetabulum; and a metatarsal IV that is mediolaterally wide and flattened in cross section.

 Included species: Based on our phylogenetic analysis, this clade currently includes Sinovenator changii, Sinusonasus magnodens, Mei long, and Daliansaurus liaoningensis gen. et sp. nov.

 Daliansaurus liaoningensis gen. et sp. nov.

Etymology: The generic name refers to the city of Dalian in the south of Liaoning province. The specific name “liaoningensis” refers to the province in which the specimen was discovered.

Locality and horizon: Lujiatun, Beipiao City, Liaoning Province; Yixian Formation, Lower Cretaceous.

Fig. 15. The living scene of Daliansaurus liaoningensis gen. et sp. nov. (DNHM D 2885) (drawn by Zhao Chuang) 

Conclusions

 It appears that small-bodied, feathered, winged paravian theropods from Liaoning—dromaeosaurids, avialans, and troodontids—were exceptionally diverse. Each group experienced its own local Early Cretaceous diversification, which produced a number of species that either coexisted or, perhaps more likely, replaced each other over time or partitioned niches and geographic ranges so that they did not extensively overlap in space. The discovery of Daliansaurus also demonstrates that Liaoning continues to produce new dinosaur taxa, and remains one of the world’s most productive sites for understanding paravian evolution, more than two decades after the first feathered dinosaurs were reported.

 SHEN Caizhi, LÜ Junchang, LIU Sizhao, Martin KUNDRÁT, Stephen L. BRUSATTE and GAO Hailong. 2017. A New Troodontid Dinosaur from the Lower Cretaceous Yixian Formation of Liaoning Province, China.  ACTA GEOLOGICA SINICA.  91(3); 763–780. 

http://www.geojournals.cn/dzxben/ch/reader/view_abstract.aspx?file_no=2017endzxb03001&flag=1

http://www.geojournals.cn/dzxben/ch/reader/create_pdf.aspx?file_no=2017endzxb03001&flag=1&journal_id=dzxben&year_id=2017

twitter.com/SteveBrusatte/status/873526560564944898

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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.