scholarly journals Insight on the anatomy, systematic relationships, and age of the Early Cretaceous ankylopollexian dinosaurDakotadon lakotaensis

PeerJ ◽  
2015 ◽  
Vol 3 ◽  
pp. e1263 ◽  
Author(s):  
Clint A. Boyd ◽  
Darrin C. Pagnac
Keyword(s):  
Early Cretaceous ◽  
Original Description ◽  
Field Work ◽  
Optimality Criteria ◽  
Dorsal Vertebra ◽  
The Past ◽  
Caudal Vertebrae ◽  
Systematic Relationships ◽  
Preparation Work ◽  
Extensive Deformation

Knowledge regarding the early evolution within the dinosaurian clade Ankylopollexia drastically increased over the past two decades, in part because of an increase in described taxa from the Early Cretaceous of North America. These advances motivated the recent completion of extensive preparation and conservation work on the holotype and only known specimen ofDakotadon lakotaensis, a basal ankylopollexian from the Lakota Formation of South Dakota. That specimen (SDSM 8656) preserves a partial skull, lower jaws, a single dorsal vertebra, and two caudal vertebrae. That new preparation work exposed several bones not included in the original description and revealed that other bones were previously misidentified. The presence of extensive deformation in areas of the skull is also noted that influenced inaccuracies in prior descriptions and reconstructions of this taxon. In addition to providing an extensive re-description ofD. lakotaensis, this study reviews previously proposed diagnoses for this taxon, identifies two autapomorphies, and provides an extensive differential diagnosis.Dakotadon lakotaensisis distinct from the only other ankylopollexian taxon known from the Lakota Formation,Osmakasaurus depressus, in the presence of two prominent, anteroposteriorly oriented ridges on the ventral surfaces of the caudal vertebrae, the only overlapping material preserved between these taxa. The systematic relationships ofD. lakotaensisare evaluated using both the parsimony and posterior probability optimality criteria, with both sets of analyses recoveringD. lakotaensisas a non-hadrosauriform ankylopollexian that is more closely related to taxa from the Early Cretaceous (e.g.,Iguanacolossus,Hippodraco, andTheiophytalia) than to more basally situated taxa from the Jurassic (e.g.,Camptosaurus, Uteodon). This taxonomic work is supplemented by field work that relocated the type locality, confirming its provenance from unit L2 (lower Fuson Member equivalent) of the Lakota Formation. Those data, combined with recently revised ages for the members of the Lakota Formation based on charophyte and ostracod biostratigraphy, constrain the age of this taxon to the late Valanginian to early Barremian.

scholarly journals Insight on the anatomy, systematic relationships, and age of the Early Cretaceous ankylopollexian dinosaur Dakotadon lakotaensis

2015 ◽  
Author(s):  
Clint A Boyd ◽  
Darrin C Pagnac
Keyword(s):  
Early Cretaceous ◽  
Original Description ◽  
Field Work ◽  
Optimality Criteria ◽  
Dorsal Vertebra ◽  
The Past ◽  
Caudal Vertebrae ◽  
Systematic Relationships ◽  
Preparation Work ◽  
Extensive Deformation

Knowledge regarding the early evolution within the dinosaurian clade Ankylopollexia drastically increased over the past two decades, in part because of an increase in described taxa from the Early Cretaceous of North America. These advances motivated the recent completion of extensive preparation and conservation work on the holotype and only known specimen of Dakotadon lakotaensis, a basal ankylopollexian from the Lakota Formation of South Dakota. That specimen (SDSM 8656) preserves a partial skull, lower jaws, a single dorsal vertebra, and two caudal vertebrae. That new preparation work exposed several bones not included in the original description and revealed that other bones were previously misidentified. The presence of extensive deformation in areas of the skull is also noted that influenced inaccuracies in prior descriptions and reconstructions of this taxon. In addition to providing an extensive re-description of D. lakotaensis, this study reviews previously proposed diagnoses for this taxon, identifies two autapomorphies, and provides an extensive differential diagnosis. Dakotadon lakotaensis is distinct from the only other ankylopollexian taxon known from the Lakota Formation, Osmakasaurus depressus, in the presence of two prominent, anteroposteriorly oriented ridges on the ventral surfaces of the caudal vertebrae, the only overlapping material preserved between these taxa. The systematic relationships of D. lakotaensis are evaluated using both the parsimony and posterior probability optimality criteria, with both sets of analyses recovering D. lakotaensis as a non-hadrosauriform ankylopollexian that is more closely related to taxa from the Early Cretaceous (e.g., Iguanacolossus, Hippodraco, and Theiophytalia) than to more basally situated taxa from the Jurassic (e.g., Camptosaurus, Uteodon). This taxonomic work is supplemented by field work that relocated the type locality, confirming its provenance from unit L2 (lower Fuson Member equivalent) of the Lakota Formation. Those data, combined with recently revised ages for the members of the Lakota Formation based on charophyte and ostracod biostratigraphy, constrain the age of this taxon to the late Valanginian to early Barremian.

scholarly journals Insight on the anatomy, systematic relationships, and age of the Early Cretaceous ankylopollexian dinosaur Dakotadon lakotaensis

2015 ◽  
Author(s):  
Clint A Boyd ◽  
Darrin C Pagnac
Keyword(s):  
Early Cretaceous ◽  
Original Description ◽  
Field Work ◽  
Optimality Criteria ◽  
Dorsal Vertebra ◽  
The Past ◽  
Caudal Vertebrae ◽  
Systematic Relationships ◽  
Preparation Work ◽  
Extensive Deformation

Knowledge regarding the early evolution within the dinosaurian clade Ankylopollexia drastically increased over the past two decades, in part because of an increase in described taxa from the Early Cretaceous of North America. These advances motivated the recent completion of extensive preparation and conservation work on the holotype and only known specimen of Dakotadon lakotaensis, a basal ankylopollexian from the Lakota Formation of South Dakota. That specimen (SDSM 8656) preserves a partial skull, lower jaws, a single dorsal vertebra, and two caudal vertebrae. That new preparation work exposed several bones not included in the original description and revealed that other bones were previously misidentified. The presence of extensive deformation in areas of the skull is also noted that influenced inaccuracies in prior descriptions and reconstructions of this taxon. In addition to providing an extensive re-description of D. lakotaensis, this study reviews previously proposed diagnoses for this taxon, identifies two autapomorphies, and provides an extensive differential diagnosis. Dakotadon lakotaensis is distinct from the only other ankylopollexian taxon known from the Lakota Formation, Osmakasaurus depressus, in the presence of two prominent, anteroposteriorly oriented ridges on the ventral surfaces of the caudal vertebrae, the only overlapping material preserved between these taxa. The systematic relationships of D. lakotaensis are evaluated using both the parsimony and posterior probability optimality criteria, with both sets of analyses recovering D. lakotaensis as a non-hadrosauriform ankylopollexian that is more closely related to taxa from the Early Cretaceous (e.g., Iguanacolossus, Hippodraco, and Theiophytalia) than to more basally situated taxa from the Jurassic (e.g., Camptosaurus, Uteodon). This taxonomic work is supplemented by field work that relocated the type locality, confirming its provenance from unit L2 (lower Fuson Member equivalent) of the Lakota Formation. Those data, combined with recently revised ages for the members of the Lakota Formation based on charophyte and ostracod biostratigraphy, constrain the age of this taxon to the late Valanginian to early Barremian.

scholarly journals Insight on the anatomy, systematic relationships, and age of the Early Cretaceous ankylopollexian dinosaur Dakotadon lakotaensis

2015 ◽  
Author(s):  
Clint A Boyd ◽  
Darrin C Pagnac
Keyword(s):  
North America ◽  
Early Cretaceous ◽  
Original Description ◽  
Field Work ◽  
Optimality Criteria ◽  
Dorsal Vertebra ◽  
Caudal Vertebrae ◽  
Systematic Relationships ◽  
Preparation Work ◽  
Extensive Deformation

Knowledge regarding the early evolution within the dinosaurian clade Ankylopollexia drastically increased over the past two decades, in part because of an increase in described taxa from the Early Cretaceous of North America. These advances motivated the recent completion of extensive preparation and conservation work on the holotype and only known specimen of Dakotadon lakotaensis, a basal ankylopollexian from the Lakota Formation of South Dakota. That specimen (SDSM 8656) preserves a partial skull, lower jaws, a single dorsal vertebra, and two caudal vertebrae. That new preparation work exposed several bones not included in the original description and revealed that other bones were previously misidentified. The presence of extensive deformation in areas of the skull is also noted that influenced inaccuracies in prior descriptions and reconstructions of this taxon. In addition to providing an extensive re-description of D. lakotaensis, this study reviews previously proposed diagnoses for this taxon, identifies three autapomorphies, and provides an extensive differential diagnosis. Dakotadon lakotaensis is distinct from the only other ankylopollexian taxon known from the Lakota Formation, Osmakasaurus depressus, in the presence of two prominent, anteroposteriorly oriented ridges on the ventral surfaces of the caudal vertebrae, the only overlapping material preserved between these taxa. The systematic relationships of Dakotadon lakotaensis are evaluated using both the parsimony and posterior probability optimality criteria, with both sets of analyses recovering D. lakotaensis as a non-hadrosauriform ankylopollexian that is more closely related to taxa from the early Cretaceous (e.g., Iguanacolossus, Hippodraco, and Theiophytalia) than to more basally situated taxa from the Jurassic (e.g., Camptosaurus, Uteodon). This taxonomic work is supplemented by field work that relocated the type locality, confirming its provenance from unit L2 (lower Fuson Member equivalent) of the Lakota Formation. Those data, combined with recently revised ages for the members of the Lakota Formation based on charophyte and ostracod biostratigraphy, constrain the age of this taxon to the late Valanginian to early Hauterivian. The only other equivalent-aged ankylopollexian taxon from North America, the poorly known Planicoxa venenica from the Poison Strip Sandstone of Utah, preserves caudal vertebrae that bear the same ventral ridges seen in D. lakotaensis, raising the possibility of a close affinity between these taxa.

Ordosemys leios, n.gen., n.sp., a new turtle from the Early Cretaceous of the Ordos Basin, Inner Mongolia

1993 ◽  
Vol 30 (10) ◽  
pp. 2128-2138 ◽  
Author(s):  
Donald B. Brinkman ◽  
Jiang-Hua Peng
Keyword(s):  
Early Cretaceous ◽  
Inner Mongolia ◽  
Cervical Vertebrae ◽  
Ordos Basin ◽  
Sister Group ◽  
Sister Group Relationship ◽  
Articular Surfaces ◽  
Caudal Vertebrae ◽  
The Ordos Basin

Ordosemys leios, n.gen., n.sp., from the Early Cretaceous Luohandong Formation, Zhidan Group, Ordos Basin, Inner Mongolia, is a primitive aquatic turtle with a reduced, fenestrated plastron. It shares with the members of the Centrocryptodira the presence of well-formed articular surfaces on the cervical and caudal vertebrae. Within the Centrocryptodira, characters of the cervical vertebrae suggest it is more closely related to the Polycryptodira than is the Meiolaniidae. Ordosemys shares with the Chelydridae the presence of two procoelous anterior caudals, but this character may be primitive for the Polycryptodira. Characters of the basicranial region of the braincase shared by Ordosemys and the Chelonioidea support a sister-group relationship between these two taxa, but a sister-group relationship between Ordosemys and the Polycryptodira is more strongly supported by characters shared by the Chelonioidea and other members of the Polycryptodira.

Herramientas digitales para recolección, procesamiento y presentación de datos de campo como instrumento para afrontar la contingencia COVID-19

2021 ◽  
Vol 5 ◽  
pp. 96-104
Author(s):  
Didier Haid Alvarado Acosta
Keyword(s):  
Learning Curve ◽  
Training Programs ◽  
Communication Technologies ◽  
Field Work ◽  
Web Based ◽  
Face To Face ◽  
The Past ◽  
Online Platforms ◽  
Virtual Libraries ◽  
Different Types

In March of 2020, the COVID-19 outbreak forced people to lock themselves inside their homes and begin the process of transitioning from face-to-face activities at work, schools and universities to a 100 % virtual method. Even when Communication Technologies (ICT) and online platforms have seen growth over the past two decades, including various virtual libraries developed by database publishers or web-based training programs that appear to shorten the learning curve (Lee, Hong y Nian, 2002), many people were unprepared for this transition and all of them are now dedicated to entering the new reality. In this order of ideas, the activities that have traditionally required the assistance of the staff have had to adapt with the use of new tools, which meet daily needs. A clear example is the field work collection tasks. In this group, there are different types such as surveys, photographs, reviews or on-site inspections. The current work presents the use of tools for collecting, validating, analysing and presenting data remotely and in real time. All of them based on the ArcGIS Online platform.

Description of a new species of Bush frog (Anura: Rhacophoridae: Raorchestes) from northwestern Yunnan, China

Zootaxa ◽  
2021 ◽  
Vol 4941 (2) ◽  
pp. 239-258
Author(s):  
YUN-HE WU ◽  
XIAO-LONG LIU ◽  
WEI GAO ◽  
YU-FAN WANG ◽  
YING-CHUN LI ◽  
...  
Keyword(s):  
New Species ◽  
Southern China ◽  
Field Work ◽  
The Body ◽  
Adult Males ◽  
The Past ◽  
Black Region ◽  
One New Species ◽  
A New Species ◽  
Northwestern Yunnan

Approximately half of the species in speciose genus Raorchestes were described during the past 10 years, yet only 11 species are known from Southeast Asia and southern China (SEA-SC), adjacent Himalayas, and northeastern India. Field work in northwestern Yunnan province, China resulted in the discovery of one new species in the genus based on morphological and molecular analyses. The new species is diagnosed by small size with 15.0–19.0 mm SVL in adult males (n=3); tongue pyriform, notched posteriorly; rudimentary webbing between toes; fingers and toes with narrow lateral dermal fringes; tibiotarsal articulation reaching anterior of the eye when hindlimb is stretched along the side of the body; relative finger lengths: I < II < IV < III, relative toe lengths: I < II < V < III < IV; inner metatarsal tubercle oval, outer metatarsal tubercle absent; finger discs and toe discs greyish or orange; flank near the crotch with a distinct black region between two creamy white patches, and the thigh having a similar black patch near the groin, proximal to another creamy white patch; a distinct “) (”-shaped dark marking on the back; male with external single subgular vocal sac; nuptial pad absent. A phylogenetic tree was reconstructed based on the mitochondrial genes for 16S rRNA and ND1. The results indicated that these individuals form a monophyletic group, and show high genetic divergence to their closest relatives within the genus (uncorrected p-distances > 3.2%) by distance of 16S comparable to the divergence between recognized Raorchestes species. This study further enriches the diversity of rhacophorids, especially in northwestern Yunnan. 

scholarly journals NILAI KEPAHLAWANAN DALAM TANGON TERPILIH SUKU KIMARAGANG DI SABAH

2021 ◽  
Author(s):  
JAMAIL MASADOR ◽  
ABDUL HALIM ALI ◽  
AZHAR WAHID
Keyword(s):  
Field Work ◽  
Self Esteem ◽  
Qualitative Approach ◽  
The Past ◽  
Fighting Spirit ◽  
Interview Methods ◽  
Younger Generation

Tangon (cerita rakyat) sering diperdengarkan dalam masyarakat suku Kimaragang. Pada umumnya, cerita-cerita rakyat (tangon) suku Kimaragang melambangkan sosiobudaya, falsafah dan gambaran nilai kepahlawanan bagi masyarakat tersebut. Namun, dewasa ini, nilai-nilai yang terkandung dalam tangon sering dilupakan, terutama oleh generasi muda. Oleh itu, kajian ini memberi perhatian pada nilai-nilai kepahlawanan yang terkandung dalam cerita rakyat suku Kimaragang di Sabah. Kajian ini menggunakan pendekatan kualitatif yang melibatkan kaedah kajian lapangan dan temu bual untuk mendokumentasi tangon. Seterusnya, data akan dianalisis menggunakan pendekatan Alamiah salah satu pendekatan dalam teori Pengkaedahan Melayu yang dikemukakan oleh Hashim Awang bagi memahami aspek-aspek kepahlawanan seperti keberanian, rela berkorban, semangat juang dan keterbukaan yang terkandung dalam cerita rakyat. Dapatan kajian ini membuktikan bahawa elemen kepahlawanan penting dikuasai, terutama dalam norma masyarakat yang kucar-kacir demi mengangkat martabat diri dan menjaga kehormatan. Sememangnya, masyarakat suku Kimaragang pada masa lampau mengamalkan nilai-nilai kepahlawanan dalam kehidupan untuk memastikan sebuah kehidupan yang aman dan sejahtera. Mengaplikasi nilai-nilai kepahlawanan dalam kehidupan masa kini merupakan suatu daripada usaha untuk mengupaya dan mengekalkan warisan yang semakin dilupakan. The telling of ‘tangon’ (folklore) is a common practice in the Kimaragang community. In general, the ‘tangon’ of the Kimaragang symbolises the socio-culture, philosophy and description of the heroism values for the community. However, nowadays, the values in ‘tangon’ are often forgotten, especially by the younger generation. This study thereforefocused on the heroism values as portrayed in the folklore of the Kimaragang. Using a qualitative approach, the field work and interview methods were utilised to document the ‘tangon’. Data was analysed using the Alamiahapproach, one of the approaches in the ’Pengkaedahan Melayu’ theory by Hashim Awang as a means to understand heroism aspects such as bravery, sacrificial spirit, fighting spirit, and openness as embodied in the folklore. The findings of this study prove that the element of heroism is important to master especially in the norms of a chaotic society in order to improve self-esteem and maintain honour. Indeed, the Kimaragang in the past practised heroism values to ensure a peaceful and prosperous life. Applying these values in life today is one of the efforts to activate and sustain an increasingly forgotten heritage.

scholarly journals Review of the Survey's activities in 1986

1987 ◽  
Vol 135 ◽  
pp. 5-7
Author(s):  
M Ghisler
Keyword(s):  
Geophysical Methods ◽  
Basic Research ◽  
Field Work ◽  
Systematic Investigation ◽  
Geological Mapping ◽  
40Th Anniversary ◽  
The Past ◽  
Applied Geology ◽  
Geological Background

The Geological Survey of Greenland (GGU) continued in 1986 the systematic investigation of the geology of Greenland. The work comprises geological mapping and basic research as well as applied geology and geophysics (fig. 1). The long term purpose is to establish the necessary geological background for evaluation of the potential of the non-living resources. The scientific and technical staff of 112 based in Copenhagen and 87 participating in the field work in Greenland carried out programmes of geological mapping and investigation, glaciological investigations, and mineral and oil assessments which included geochemical and geophysical methods. In April 1986 GGU celebrated its 40th anniversary. A special publication dedicated to GGU's former director, K. Ellitsgaard-Rasmussen, was issued which covers different aspects of the Survey's work in the developments in Greenland geology over the past ten years.

scholarly journals Reigning with Christ for a Thousand Years: Two Prophets of Russian Millennialism

2020 ◽  
Vol 38 (3) ◽  
pp. 149-177
Author(s):  
Sergey Petrov ◽  
Keyword(s):  
Field Work ◽  
Old Russian ◽  
The Past ◽  
The Usa ◽  
Historical Accounts ◽  
Practical Sense

The article explores the crossroads of two surviving groups of “old Russian sectarianism” — Molokan Jumpers and JehovistsIl’intsy — for whom the anticipation of the millennial kingdom on earth was a central doctrinal tenet. Researchers in the past, as well as modern scholars of religion, usually have not paid attention to the connection between the two movements, which was at one time quite substantial both in the doctrinal and the practical sense. Handwritten, typed and unofficially published sources gathered by the author during field work served as the principal material for the article. They include letters of Nikolai Il’in to his followers and his other writings, the memoirs of Molokan elders, and the historical accounts found among the Molokans of Armenia and the USA.

scholarly journals Shaping our Taxonomic Legacy through Openly Sharing Primary Biodiversity Data in Taxonomic Revisions

2019 ◽  
Vol 3 ◽  
Author(s):  
Torsten Dikow
Keyword(s):  
Data Dissemination ◽  
Original Description ◽  
Published Data ◽  
Data Standards ◽  
Global Biodiversity Information Facility ◽  
High Quality ◽  
Data Repositories ◽  
The Past ◽  
Text Document ◽  
Digital Format

Taxonomy has a long tradition of describing earth’s biodiversity. For the past 20 years or so, taxonomic revisions have become available in PDF format, which is regarded by most practicing taxonomists to be a good means of digital dissemination. However, a PDF document is nothing more than a text document that can be transferred easily for viewing among researchers and computer platforms. In today’s world, traditional taxonomic techniques need to be met with novel tools to make data dissemination a reality, make species hypotheses more robust, and open the field up to rigorous scientific testing. Here, I argue that high-quality taxonomic output is not just the publication of detailed species descriptions and re-descriptions, precise taxon delimitations, easy-to-use identification keys, and comprehensively undertaken and illustrated revisions. Rather, in addition high-quality taxonomic output embraces digital workflows and data standards to disseminate captured and published data in structured, machine-readable formats to data repositories so as to make all data openly accessible. Imagine that a taxonomist today has every original description and every subsequent re-description of a species at her/his fingertips online, has every specimen photograph produced by a previous reviser digitally available in the original resolution, and can take advantage of existing, openly accessible data and resources produced by peers in digital format in the past. When we as taxonomists provide such findable, accessible, interoperable, and reusable (FAIR) data, the future of biodiversity discovery will accelerate and our own taxonomic legacy will be enhanced. Cybertaxonomic tools provide methods to accomplish this goal and their use and implementation is here summarized in the context of revisionary taxonomy from the standpoint of a publishing taxonomist. While many of the tools have been around for some time now, very few taxonomists embrace and utilize these tools in their publications. This presentation will provide information on what kind of data can and should be openly shared (e.g., specimen occurrence data, digital images, names, descriptions, authors) and outline best practices utilizing globally unique identifiers for specimens and data. Data standards and the best-suited data repositories such as the Global Biodiversity Information Facility (GBIF) and Zenodo, with its Biodiversity Literature Repository, and the Plazi TreatmentBank, an emerging species portal, are discussed to illustrate retrospective and prospective data capture of taxonomic revisions.

Sign in / Sign up

Export Citation Format

Share Document