[Paleontology • 2017] Keilhauia nui • A New Ophthalmosaurid (Ichthyosauria) from Svalbard, Norway, and Evolution of the Ichthyopterygian Pelvic Girdle ---ScRaBBlE

 Keilhauia nui 

Delsett, Roberts, Druckenmiller & Hurum, 2017

  

reconstruction: Esther van Hulsen

DOI: 10.1371/journal.pone.0169971 

Abstract

In spite of a fossil record spanning over 150 million years, pelvic girdle evolution in Ichthyopterygia is poorly known. Here, we examine pelvic girdle size relationships using quantitative methods and new ophthalmosaurid material from the Slottsmøya Member Lagerstätte of Svalbard, Norway. One of these new specimens, which preserves the most complete ichthyosaur pelvic girdle from the Cretaceous, is described herein as a new taxon, Keilhauia nui gen. et sp. nov. It represents the most complete Berriasian ichthyosaur known and the youngest yet described from the Slottsmøya Member. It is diagnosed on the basis of two autapomorphies from the pelvic girdle, including an ilium that is anteroposteriorly expanded at its dorsal end and an ischiopubis that is shorter or subequal in length to the femur, as well as a unique character combination. The Slottsmøya Member Lagerstätte ichthyosaurs are significant in that they represent a diverse assemblage of ophthalmosaurids that existed immediately preceding and across the Jurassic–Cretaceous boundary. They also exhibit considerable variation in pelvic girdle morphology, and expand the known range in size variation of pelvic girdle elements in the clade.

Systematic Paleontology

Ichthyosauria de Blainville 1835

Neoichthyosauria Sander 2000

Thunnosauria Motani 1999

Ophthalmosauridae Baur 1887

Keilhauia gen. nov.

Keilhauia nui sp. nov.

Holotype and only specimen: PMO 222.655, an articulated, partial skeleton consisting of an incomplete rostrum, the dorsal and preflexural vertebrae, the right pectoral girdle and forefin, most of the pelvic girdle and both femora.

Etymology: Genus name in honor of Baltazar Mathias Keilhau (1797–1858), the first Norwegian geologist to do fieldwork in the Arctic. He was part of an expedition to Svalbard (Spitsbergen) in 1827. His collection is housed at the Natural History Museum in Oslo, Norway, where PMO 222.655 is also housed. Species name in honor of Natur og Ungdom (Young Friends of the Earth Norway) working to protect the Arctic environment, who celebrate their 50 year anniversary in 2017.

Holotype locality: Island of Spitsbergen, north side of Janusfjellet, approximately 13 km north of Longyearbyen, Svalbard, Norway. UTM WGS84 33X 0518847 8696044

Holotype horizon and stage: Slottsmøya Member, Agardhfjellet Formation, Janusfjellet Subgroup, early Berriasian, Early Cretaceous. 44.8 metres above the echinoderm marker bed.

[lower] Fig 3. Skeletal map of Keilhauia nui (PMO 222.655) viewed from the side stratigraphically down, i.e. the prepared side. Vertebrae numbers (“x#”) indicate position relative to the anterior end of the preserved skeleton and do not correspond to their actual position in the column. Dashed lines show three faults. Scale bar equals 50 cm. Modified from Delsett et al. 2016.

 Lene Liebe Delsett, Aubrey J. Roberts, Patrick S. Druckenmiller and Jørn H. Hurum. 2017. A New Ophthalmosaurid (Ichthyosauria) from Svalbard, Norway, and Evolution of the Ichthyopterygian Pelvic Girdle. PLoS ONE. 12 (1): e0169971. DOI: 10.1371/journal.pone.0169971

Nyoppdaget fiskeøgle oppkalt etter Natur og Ungdom @NaturogUngdom

https://nu.no/nu-50-ar/2017/01/nyoppdaget-fiskeogle-oppkalt-etter-natur-og-ungdom/

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روابط التحميل والمشاهدة، الروابط المباشرة للتحميل

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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] Cascolus ravitis • A New Crustacean from the Herefordshire (Silurian) Lagerstätte, UK , and Its Significance in Malacostracan Evolution ---ScRaBBlE

Cascolus ravitis 

Siveter, Briggs, Siveter, Sutton & Legg, 2017  

 DOI: 10.1098/rspb.2017.0279 

Abstract

Cascolus ravitis gen. et sp. nov. is a three-dimensionally preserved fossil crustacean with soft parts from the Herefordshire (Silurian) Lagerstätte, UK. It is characterized by a head with a head shield and five limb pairs, and a thorax (pereon) with nine appendage-bearing segments followed by an apodous abdomen (pleon). All the appendages except the first are biramous and have a gnathobase. The post-mandibular appendages are similar one to another, and bear petal-shaped epipods that probably functioned as a part of the respiratory–circulatory system. Cladistic analysis resolves the new taxon as a stem-group leptostracan (Malacostraca). This well-preserved arthropod provides novel insights into the evolution of appendage morphology, tagmosis and the possible respiratory–circulatory physiology of a basal malacostracan.

An international team of scientists led by the University of Leicester has discovered a new 430 million-year-old fossil and has named it in honour of Sir David Attenborough - who grew up on the University campus.  

Systematic palaeontology

Phylum Arthropoda
Subphylum Crustacea

Class Malacostraca
Subclass Phyllocarida

Order Leptostraca

Genus Cascolus gen. nov.

Type species: Cascolus ravitis sp. nov.

Etymology: The new crustacean is named in honour of the naturalist and broadcaster Sir David Attenborough, who grew up on University College Leicester campus, in celebration of his 90th birthday. Latin castrum ‘stronghold’ and colus ‘dwelling in’; alluding to the Middle/Old English source for the surname ‘Attenborough, derived from atten ‘at the’ and burgh ‘a fortified place’. Latin Ratae, the Roman name for Leicester, vita ‘life’ and commeatis ‘a messenger’.


  Diagnosis of genus (monotypic) and species: An elongate body comprising a head with a head shield, pedunculate eyes and five limb pairs; and a trunk consisting of a thorax (pereon) with nine limb-bearing segments and an apodous abdomen (pleon). The first appendage is uniramous and has three slender flagella longer than the body. All other appendages are biramous and have a gnathobase. The post-mandibular appendages are similar to one another, except that the fourth head appendage bears a single petal-shaped epipod, and the fifth head appendage and each trunk appendage bear two petal-shaped epipods.

  Material: Only known from the holotype OUMNH C.29698 (figure 1v), a specimen with soft parts reconstructed in three dimensions (figure 1a–u).

  Locality and horizon: Herefordshire, England, UK; Wenlock Series, Silurian.


David J. Siveter, Derek E. G. Briggs, Derek J. Siveter, Mark D. Sutton and David Legg. 2017. A New Crustacean from the Herefordshire (Silurian) Lagerstätte, UK, and Its Significance in Malacostracan Evolution. Proceedings of the Royal Society B.  DOI: 10.1098/rspb.2017.0279 

 430 million-year-old fossil named in honor of Sir David Attenborough
 http://phy.so/409322871   @physorg_com

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روابط التحميل والمشاهدة، الروابط المباشرة للتحميل

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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] Zhiwenia coronata • A Soft‐bodied Euarthropod from the early Cambrian Xiaoshiba Lagerstätte of China supports A New Clade, Protosutura nov., of Basal Artiopodans with Dorsal Ecdysial Sutures ---ScRaBBlE

 Zhiwenia coronata

Du, Ortega‐Hernández, Yang & Zhang, 2018

  DOI: 10.1111/cla.12344  

 twitter.com/InvertebratePal 

 Abstract

We describe the exceptionally well‐preserved non‐trilobite artiopodan Zhiwenia coronata gen. et sp. nov. from the Cambrian Stage 3 Xiaoshiba Lagerstätte in Yunnan, China. The exoskeleton consists of a cephalic shield with dorsal sutures expressed as lateral notches that accommodate stalked lateral eyes, an elongate trunk composed of 20 tergites—the first of which is reduced—and a short tailspine with marginal spines. Appendicular data include a pair of multi‐segmented antennae, and homonomous biramous trunk limbs consisting of an endopod with at least seven podomeres and a flattened exopod with lamellae. Although the presence of cephalic notches and a reduced first trunk tergite invites comparisons with the petalopleurans Xandarella, Luohiniella and Cindarella, the proportions and exoskeletal tagmosis of Zhiwenia do not closely resemble those of any major group within Trilobitomorpha. Parsimony and Bayesian phylogenetic analyses consistently support Zhiwenia as sister‐taxon to the Emu Bay Shale artiopodan Australimicola spriggi, and both of them as closely related to Acanthomeridion from the Chengjiang. This new monophyletic clade, Protosutura nov., occupies a basal phylogenetic position within Artiopoda as sister‐group to Trilobitomorpha and Vicissicaudata, illuminates the ancestral organization of these successful euarthropods, and leads to a re‐evaluation of the evolution of ecdysial dorsal sutures within the group.

Fig. 2. Completely articulated specimen of Zhiwenia coronata gen. et sp. nov. from the Cambrian Stage 3 Xiaoshiba Lagerst€atte. (a) YKLP 12370 Holotype, dorsal view of a complete individual. (b) Interpretative diagram.

Fig. 5. Morphological reconstruction of Zhiwenia coronata gen. et sp. nov. from the Xiaoshiba Lagerst€atte.

Euarthropoda Lankester, 1904 (see discussion in Ortega-Hernandez, 2016) 

Artiopoda Hou and Bergstrom, 1997 (see also Stein € and Selden, 2012). 

Protosutura nov. 

Diagnosis. Non-biomineralized artiopodan euarthropods characterized by a short semicircular cephalic shield with simple dorsal ecdysial sutures located on either side of the head (secondarily lost in some representatives). Trunk elongate and with homonomous construction, consisting exclusively of freely articulating tergites of subequal length that convey a subrectangular to suboval exoskeletal outline. Posterior trunk tergites strongly curved. Tailspine spinose and short—less than half the trunk length—occasionally bearing marginal spines of variable number and size. 

Etymology. Derived from the Greek prefix proto (first, primitive), and the Latin root sutura, referencing the presence of dorsal ecdysial sutures on the head shield. 

Included taxa. Acanthomeridion serratum Hou et al., 1989; Acanthomeridion anacanthus Hou et al., 2017; Australimicola spriggi Paterson et al., 2012; Zhiwenia coronata gen. et. sp. nov.

Zhiwenia coronata gen. et. sp. nov.

Type species, locality and stratigraphy. Zhiwenia coronata gen. et. sp. nov. from the Xiaoshiba section (Fig. 1), Kunming, Yunnan; Cambrian Stage 3 Hongjingshao Formation, Yunnanocephalus– Chengjiangaspis–Hongshiyanaspis Biozone (Yang et al., 2013, 2014, 2015, 2016a, b, 2018).

Etymology. The new genus is named in memory of Professor Zhi-Wen Jiang for his contributions to microfossils and biostratigraphy of Yunnan Province; coron (Latin), crown, referring to the shape of the two-notch bearing cephalic shield. 

Fig. 6. Results of parsimony and Bayesian phylogenetic analyses. All trees depict a strict consensus. Asterisks indicate presence of dorsal ecdysial sutures on cephalic shield.
 (c) Implied weight parsimony, k = 5, 10 (1 MPT, CI = 0.41, RI = 0.73). 

Kun‐Sheng Du, Javier Ortega‐Hernández, Jie Yang and Xi‐Guang Zhang. 2018. A Soft‐bodied Euarthropod from the early Cambrian Xiaoshiba Lagerstätte of China supports A New Clade of Basal Artiopodans with Dorsal Ecdysial Sutures. Cladistics.  DOI: 10.1111/cla.12344  

 twitter.com/InvertebratePal/status/1014039091179147264

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روابط التحميل والمشاهدة، الروابط المباشرة للتحميل

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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] Ascendonanus nestleri • First Arboreal 'Pelycosaurs' (Synapsida: Varanopidae) from the early Permian Chemnitz Fossil Lagerstätte, SE Germany, with A Review of Varanopid Phylogeny ---ScRaBBlE

 Ascendonanus nestleri 

Spindler, Werneburg, Schneider, Luthardt, Annacker & Rößler, 2018

   DOI: 10.1007/s12542-018-0405-9 
  Artwork by F. Spindler

Abstract

A new fossil amniote from the Fossil Forest of Chemnitz (Sakmarian-Artinskian transition, Germany) is described as Ascendonanus nestleri gen. et sp. nov., based on five articulated skeletons with integumentary preservation. The slender animals exhibit a generalistic, lizard-like morphology. However, their synapsid temporal fenestration, ventrally ridged centra and enlarged iliac blades indicate a pelycosaur-grade affiliation. Using a renewed data set for certain early amniotes with a similar typology found Ascendonanus to be a basal varanopid synapsid. This is the first evidence of a varanopid from Saxony and the third from Central Europe, as well as the smallest varanopid at all. Its greatly elongated trunk, enlarged autopodia and strongly curved unguals, along with taphonomical observations, imply an arboreal lifestyle in a dense forest habitat until the whole ecosystem was buried under volcanic deposits. Ascendonanus greatly increases the knowledge on rare basal varanopids; it also reveals a so far unexpected ecotype of early synapsids. Its integumentary structures present the first detailed and soft tissue skin preservation of any Paleozoic synapsid. Further systematic results suggest a varanodontine position for Mycterosaurus, the monophyly of South African varanopids including Anningia and the distinction of a skeletal aggregation previously assigned to Heleosaurus, now renamed as Microvaranops parentis gen. et sp. nov.

Keywords: Arboreality, Synapsid phylogeny, Adaptation, Cisuralian, Soft tissue preservation, Volcanic taphonomy

Fig. 14 Counterslabs of MNC-TA1045 of Ascendonanus nestleri gen. et sp. nov.

Scale bar measures 2 cm

 

Systematic Paleontology

(unranked) Synapsida Osborn, 1903

Family Varanopidae Romer and Price, 1940

Remarks. Spelling after Reisz and Dilkes 2003, 

replacing ‘Varanopsidae’ (Romer and Price 1940) and 

‘Varanopseidae’ (Langston and Reisz 1981).

Ascendonanus nestleri gen. et sp. nov.

Fig. 34: Life reconstruction of a new varanopid synapsid, Ascendonanus nestleri, from the Permian petrified forest of Chemnitz, Germany. Body proportions, integument and arboreality were concluded from five specimens.  

Artwork by F. Spindler 

Etymology. Latin for 'climbing dwarf,' with epithet honoring Mr. Knut Nestler, citizen scientist from Chemnitz, who passed away in 2016 after decades of friendship and deeply appreciated cooperation with the Chemnitz Museum.

Frederik Spindler, Ralf Werneburg, Joerg W. Schneider, Ludwig Luthardt, Volker Annacker and Ronny Rößler. 2018. First Arboreal 'Pelycosaurs' (Synapsida: Varanopidae) from the early Permian Chemnitz Fossil Lagerstätte, SE Germany, with A Review of Varanopid Phylogeny. PalZ.  DOI: 10.1007/s12542-018-0405-9

Vortrag: Saurier unter Chemnitz – neue Erkenntnisse aus dem Versteinerten Wald

naturkundemuseum-chemnitz.de/de/news/280.html

  

 twitter.com/tetzoo/status/930750767765565440

 twitter.com/paleowire/status/974223192603553798

 twitter.com/en_route_paleo/status/974348995626708993

Abstract: The palaeontological collection of Chemnitz has been a constantly growing, developing and limitless source of knowledge on the relation of earth’s history and the development of life on earth, for over three centuries. Initially founded by science interested citizens on a voluntary basis, only with the premise to enable public access to collections and scientific information, it has developed and has been structuralized based on professional geoscientific considerations. Today, the collection is preserved, added to through selected purchases, diversely used and it serves as a foundation for globally linked up scientific research, as well as for interdisciplinary exhibitions and diverse educational programs and activities. The essence of the collection documents the evolution and preservation of terrestrial ecosystems with a special emphasis on volcanic environments and petrified wood.

Ronny Rößler and Thorid Zierold. 2017. Die paläontologische Sammlung des Museums für Naturkunde Chemnitz – eine Zeitreise zu den Wurzeln der Paläobotanik. Veröff. Museum für Naturkunde Chemnitz. 40; 5-30.

researchgate.net/publication/320931509_Die_palaontologische_Sammlung_des_Museums_fur_Naturkunde_Chemnitz_-_eine_Zeitreise_zu_den_Wurzeln_der_Palaobotanik

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روابط التحميل والمشاهدة، الروابط المباشرة للتحميل

من هنا

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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] Yunnanechinus luopingensis • A New Stem Group Echinoid from the Triassic of China leads to A Revised Macroevolutionary History of Echinoids during the end-Permian Mass Extinction ---ScRaBBlE

Yunnanechinus luopingensis

Thompson, Hu, Zhang, Petsios, Cotton, Huang, Zhou, Wen & Bottjer, 2018

 DOI: 10.1098/rsos.171548 

Abstract

The Permian–Triassic bottleneck has long been thought to have drastically altered the course of echinoid evolution, with the extinction of the entire echinoid stem group having taken place during the end-Permian mass extinction. The Early Triassic fossil record of echinoids is, however, sparse, and new fossils are paving the way for a revised interpretation of the evolutionary history of echinoids during the Permian–Triassic crisis and Early Mesozoic. A new species of echinoid, Yunnanechinus luopingensis n. sp. recovered from the Middle Triassic (Anisian) Luoping Biota fossil Lagerstätte of South China, displays morphologies that are not characteristic of the echinoid crown group. We have used phylogenetic analyses to further demonstrate that Yunnanechinus is not a member of the echinoid crown group. Thus a clade of stem group echinoids survived into the Middle Triassic, enduring the global crisis that characterized the end-Permian and Early Triassic. Therefore, stem group echinoids did not go extinct during the Palaeozoic, as previously thought, and appear to have coexisted with the echinoid crown group for at least 23 million years. Stem group echinoids thus exhibited the Lazarus effect during the latest Permian and Early Triassic, while crown group echinoids did not.

KEYWORDS: sea urchin, Triassic, Lazarus effect, echinoderm, Luoping Biota

Figure 1. Specimens and location of Yunnanechinus luopingensis n. sp.
(a) Locality map showing the location of the Luoping Biota marked as star.
(b) specimen 61701; note the bulge in the centre of the test which probably indicates the Aristotle's lantern inside of the compressed test. (c) Specimen 32321 which shows an apical view of a compressed test with apical disc with genital plates, an ocular plate and the madreporite. (d) Specimen 61163 showing a compressed test with spines. (e) Close-up of spines and ambulacral plate on specimen 32321. Note the absence of a milled ring and the striate nature of the spines. (f) Close-up view of the madreporite, ocular plate and adapical coronal plating of specimen 32321. Note the imbrication of the plates, with more adoral plating imbricating over more adapical plates. (g) Close-up of coronal plating and spines on specimen 32321. Spines and tubercles are arranged in distinct rows with larger spines lying slightly below corresponding imperforate and non-crenulate tubercles.

Scale bars in (b,d) are 1 cm, bar in (c) is 2 mm and bars in (e–g) are 500 µm.

Systematic palaeontology

Echinoidea Leske, 1778

Stem group Echinoidea

Incertae familiae

Genus Yunnanechinus n. gen.

Etymology. Named for Yunnan, China from whence the type species is known.

Type species. Yunnanechinus luopingensis n. sp.

Yunnanechinus luopingensis n. sp.

Etymology. Named for the Luoping Biota, the fossil Lagerstätte from which the species is described.

Diagnosis. Test with imbricate plating, at least adapically and ambitally. Genital plates with one gonopore per plate (figure 1f). Plates of apical system covered with small, imperforate non-crenulate tubercles. Interambulacral plates polygonal to subpentagonal in shape. Interambulacral plates with a single imperforate non-crenulate tubercle, and sparse imperforate non-crenulate secondary tubercles. Spines less than half the diameter of the test in length, finely striate and without a milled ring (figure 1e,g).

Material. The holotype is specimen LPI-32321, paratypes are specimens LPI-2638, LPI-61163, and LPI-61701A,B.

Occurrence. All specimens from the Middle Anisian (Pelsonian) Guanling Formation of the Luoping Biota of Yunnan Province, South China.

Jeffrey R. Thompson, Shi-xue Hu, Qi-Yue Zhang, Elizabeth Petsios, Laura J. Cotton, Jin-Yuan Huang, Chang-yong Zhou, Wen Wen and David J. Bottjer. 2018. A New Stem Group Echinoid from the Triassic of China leads to A Revised Macroevolutionary History of Echinoids during the end-Permian Mass Extinction. ROYAL SOCIETY OPEN SCIENCE. DOI: 10.1098/rsos.171548

  

For #FossilFriday here's Yunnanechinus luopingensis from our paper that came out earlier this week. The #phylogenetic placement of this species indicates that a lineage of the stem group #seaurchins, which were diverse in the #Palaeozoic Era, actually survived into the #Mesozoic! 

 twitter.com/senorjefe33/status/959540124403974144

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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.