A5068403445- Paleontology and Stratigraphy of Fossils
- Geology and Paleoclimatology Research
- Evolution and Paleontology Studies
- Geological formations and processes
- Paleontology and Evolutionary Biology
- Morphological variations and asymmetry
- Geological and Geophysical Studies Worldwide
- Marine Biology and Ecology Research
- Geological and Geophysical Studies
- Archaeological and Geological Studies
- Archaeological and Historical Studies
- Geological and Geochemical Analysis
- Pleistocene-Era Hominins and Archaeology
- Fossil Insects in Amber
- Mollusks and Parasites Studies
- Marine and environmental studies
- Echinoderm biology and ecology
- Marine and coastal plant biology
- Geological Studies and Exploration
- Problem and Project Based Learning
- Wildlife-Road Interactions and Conservation
- Robotic Locomotion and Control
- Innovative Teaching Methods
- Parasite Biology and Host Interactions
- earthquake and tectonic studies
Universidad Complutense de Madrid
2016-2023
Universitat Rovira i Virgili
2023
Universidad de Los Andes
2018-2021
Universidad de Los Andes
2019-2021
Instituto de Geociencias
2017
University of West Bohemia
2014-2015
Chinese Academy of Sciences
2012-2014
Nanjing Institute of Geology and Paleontology
2012-2014
Universidad de Zaragoza
2009-2012
Natural History Museum
2011
Yuanlong Zhao, Jinliang Yuan, Loren E. Babcock, Qingjun Guo, Jin Peng, Leiming Yin, Xinglian Yang, Shanchi Chunjiang Wang, Robert R. Gaines, Jorge Esteve, Tongsu Tai, Ruidong Yue Haijing Sun, Yuning Yang. Episodes 2019;42:165-84. https://doi.org/10.18814/epiiugs/2019/019013
Revealing the patterns and drivers of diversity in Cambrian requires an understanding distribution. On a dynamic Earth with uncertain palaeogeography, range novel methodology approaches. Trilobites, extremely diverse group arthropods, underwent important shifts morphology throughout Cambrian. However, mechanisms driving their global dispersal diversification during early Palaeozoic remain inadequately understood. Persistent issues studying facilitators distribution include morphological life...
Research Article| June 01, 2011 Purujosa trilobite assemblage and the evolution of enrollment Jorge Esteve; Esteve * 1Área de Paleontología-IUCA (Instituto Universitario Investigación en Ciencias Ambientales), Departamento la Tierra, Universidad Zaragoza, 50009 Spain *E-mail: jorgeves@unizar.es. Search for other works by this author on: GSW Google Scholar Nigel C. Hughes; Hughes 2Department Earth Sciences, University California−Riverside, Riverside, California 92521, USA Samuel Zamora...
Trilobites are typified by the behavioural and morphological ability to enrol their bodies, most probably as a defence mechanism against adverse environmental conditions or predators. Although trilobites could at least partially, there is uncertainty about whether olenellids—among phylogenetically stratigraphically basal representatives—could perform this behaviour because of poorly caudalized trunk scarcity coaptative devices. Here, we report complete—but not encapsulating—enrolment for...
Exoskeletal abnormalities in middle Cambrian paradoxidid trilobites from Purujosa (Eastern Iberian Chain, NE Spain) are herein analyzed for the first time.Two distinct types reported.The is represented by triangular or asymmetrical V-to W-shaped breaks on margins of isolated sclerites (cranidia, free cheeks and hypostomes).The second group shortened thoracic pleural spines complete nearly individuals.Possible causes these injuries discussed, but some cases a single cause/effect explanation...
Inter-regional Cambrian correlations are difficult amongst different palaeogeographic provinces, because of a lack shared genera and species between provinces.The Drumian Stage shows this difficulty it was defined by the FAD agnostoid Ptychagnostus atavus, which has not yet been found in Mediterranean subprovince.Thus is necessary to establish correlation ISCS scale local using other trilobites.New data from Iberian Chains review previous works suggest that bases Pardailhania hispida atavus...
Abstract Arthropods (i.e. insects, spiders, crustaceans, myriapods and others), are the most successful Phanerozoic animals. The group is characterized by possession of a segmented body, jointed limbs hard cuticle that episodically moulted. One highly but now extinct arthropods trilobites. Trilobites underwent episodic moulting (ecdysis), trilobites possess facial sutures, lines weakness in cephalon, via which exuviae shed animal emerges. However, zones appear to represent structural...
Morphology permits the extracting of information to study patterns disparity and diversity a particular group animals through time. Enrolment is characteristic behaviour trilobites, having been first recorded in Cambrian continued until their demise at end Permian mass extinction. Morphological trends related enrolment strategies have documented previously but are yet analysed morphospace framework. Here we analyse cephalic shape wide range trilobite taxa using geometric morphometrics. These...
Computational Fluid Dynamic simulations (CFD) show that the Ordovician trilobite Microparia speciosa had a high stability in horizontal plane (parallel to flow currents), suggesting it could be very stable water column when was enrolled, for hovering or get stabilization current disturbed swimming. This indicates new way use enrolment trilobites during radiation, not only protection against predators environment but also as hydrodynamic tool maintain within column. Metachronal propulsion...
Eccaparadoxides? pradoanus and Eccaparadoxides mediterraneus are both widespread trilobite species described from the middle Cambrian of Mediterranean region.Analysis based on a pooled sample 500 specimens demonstrates that many characters have been used to define these show continuous variations, some which related ontogeny.In addition, morphometric analyses metric two cannot be distinguished basis either.Many studied herein widely in definitions descriptions other paradoxidid species,...
Abstract: The ability to enrol effectively evolved several times among trilobites. Here, we show that, unlike most redlichiid trilobites that could not enrol, both morphotypes of Eccaparadoxides pradoanus from the middle Cambrian Spain enrolled so as enclose ventral surface beneath exoskeleton and possessed specialized articulating devices facilitated this behaviour. holaspid thorax all E. was divided into two principal regions. boundary between these marked a transition anterior segments...
Enrolment was a major defensive strategy for trilobites that significantly contributed to their evolutionary success. The ability enrol also helped constrain the morphological evolution of trilobites, which in part driven by need improve this capability encapsulate soft parts body within mineralized dorsal exoskeleton. Here, we describe unique example gut content fossilization an enrolled trilobite from Cambrian China, and propose taphonomic scenario considers possible implication enrolment...
The Great Ordovician Biodiversification Event (GOBE) represents a diversification at lower taxonomic levels of most body plans that had appeared during the Cambrian explosion. Among trilobites, several novelties related to enrolment evolved GOBE. A kinematic analysis by means 3D modelling some new types shows no relationship with those trilobites. While structures emerged for first time in trilobites (e.g. articulations and panderian organs), other anterior posterior arch head tail) appear...
Oryctocephalus indicus is a widespread trilobite species described from the lower–middle Cambrian (provisional Stage 5) of south China, North Korea, India, USA and possibly Greenland. Principal component analysis (PCA) thin-plate splines (TPSs) based on pooled sample 359 specimens four sections in Guizhou Province, demonstrated that shape this very constant, only small difference detected deeper part basin. Most variation taphonomically controlled, Sanwan Section show modest natural due to...
Abstract Trilobites were capable of enroling in different ways based on the flexible articulation thoracic segments and associated interlocking devices; type enrolment (spiral or sphaeroidal) is thought to have largely depended coaptative devices that each trilobite used enclose body. Based X‐ray microtomography scans complete enrolled specimens from Cambrian, we created three‐dimensional (3D) computer models assess kinematics needed achieve both types. We demonstrate closely related...
Enrolled agnostids have been known since the beginning of nineteenth century but assemblages with high number enrolled specimens are rare.There different hypotheses about life habits this arthropod group and why they enrolled.These include: a planktic or epiplanktic habit, rolled-up posture resulting from clapping cephalon pygidium together, ectoparasitic habit sessile lifestyle, either attached to seaweeds on sea floor.Herein we describe two new middle Cambrian Purujosa (Iberian Chains,...
A systematic revision of the oryctocephalid trilobites provides additional data for definition a revised zonation Cambrian Series 2-Series 3 boundary at Balang in South China. The offers new understanding biostratigraphical correlation this debated limit. was carried out Wuliu-Zengjiayan Section and following trilobite zones: (1) Protoryctocephalus arcticus; (2) Bathynotus kueichouensis—Ovatoryctocara sinensis Zone (upper part 2); (3) Oryctocephalus indicus (base 3). This suggests that...
Abstract Burlingia balangensis sp. nov. from the lower Cambrian of South China represents earliest species this genus, and suggests that genus may have originated in China. A revision shows B. primitiva obscura can be used order to indentify base Stage 5 when other trilobites are absent because their last appearance datum (LAD) coincides with first (FAD) Oryctocephalus indicus . Available palaeogeographic palaeoclimatic models suggest five major palaeocurrents during times which could...
Three-dimensional models reveal how the mechanics of exoskeletal enrolment changed during development a model organism for insights into ancient arthropod development, 429-million-year-old trilobite Aulacopleura koninckii. Changes in number, size and allocation segments within trunk, coupled with need to maintain effective shielding soft tissue enrolment, necessitated transition style about onset mature growth. During an earlier growth phase, was sphaeroidal, venter trunk fitting exactly...