A5052301043- Paleontology and Stratigraphy of Fossils
- Marine Biology and Ecology Research
- Echinoderm biology and ecology
- Geology and Paleoclimatology Research
- Marine and coastal plant biology
- Evolution and Paleontology Studies
- Paleontology and Evolutionary Biology
- Geological and Geophysical Studies Worldwide
- Crustacean biology and ecology
- Archaeological and Geological Studies
- Geological formations and processes
- Methane Hydrates and Related Phenomena
- Geological and Geophysical Studies
- Cephalopods and Marine Biology
- Archaeological and Historical Studies
- Coral and Marine Ecosystems Studies
- Ichthyology and Marine Biology
- Ocean Acidification Effects and Responses
- Fish biology, ecology, and behavior
- Mediterranean and Iberian flora and fauna
- Pleistocene-Era Hominins and Archaeology
- Calcium Carbonate Crystallization and Inhibition
- Marine Ecology and Invasive Species
- Geography and Environmental Studies in Latin America
- Protist diversity and phylogeny
Natural History Museum
2010-2024
Universidad de Zaragoza
2010-2024
Instituto Geológico y Minero de España
2015-2024
Alibaba Group (China)
2023
Instituto de Geociencias
2023
Consejo Superior de Investigaciones Científicas
2023
Cambrian Innovation (United States)
2022
National Museum of Natural History
2013-2017
Smithsonian Institution
2013-2017
Nanjing Institute of Geology and Paleontology
2014
Echinoderms are a major group (phylum) of invertebrate animals with rich fossil record stretching back to the Cambrian period, approximately 518 million years ago. While all modern species characterized by pentaradial (i.e., fivefold) symmetry, echinoderms also include taxa different types symmetry (e.g., bilateral symmetry). These distinct forms were present from very early in phylum's history, demonstrating that initial diversification echinoderm body plans was extremely rapid. The...
Background. Urinary tract infection (UTI) is a common problem in children. Because clinical findings and commonly used blood indices are nonspecific, the distinction between lower upper urinary cannot be made easily this population. However, important because renal can induce parenchymal scarring. The objective of study was to determine accuracy procalcitonin (PCT) compared with C-reactive protein (CRP) rapid tests predict involvement children febrile UTI. Methods. PCT CRP were measured...
A new edrioasteroid fauna from the Ordovician of Morocco, North Africa includes eight isorophid species placed in six genera which three are new. phylogenetic analysis Moroccan and other taxa places these edrioasteroids into a framework. Pyrgocystidae is redefined to include plesiomorphic isorophids with hood plates underlying cover plates. New pyrgocystid Streptaster nodosus sp. nov., Belochthus? chauveli Argodiscus espilezorum nov. Moroccopyrgus matacarros gen. et Isorophinid Isorophus...
Echinoderms are unique in being pentaradiate, having diverged from the ancestral bilaterian body plan more radically than any other animal phylum. This transformation arises during ontogeny, as echinoderm larvae initially bilateral, then pass through an asymmetric phase, before giving rise to pentaradiate adult. Many fossil echinoderms radial and a few asymmetric, but until now none have been described that show original stage evolution. Here we report new fossils early middle Cambrian of...
Abstract The distribution of all known Cambrian echinoderm taxa, encompassing both articulated specimens and taxonomically diagnostic isolated ossicles, is documented for the first time. database described by 2011 comprises 188 species recorded from 65 formations around world. Formations that have yielded echinoderms are unequally distributed in space Only Laurentia West Gondwana provide reasonably complete records at resolution Stage. review biogeographical distributions eight major clades...
The phylogenetic relationships between major groups of plesiomorphic pentaradial echinoderms, the Paleozoic crinoids, blastozoans, and edrioasteroids, are poorly understood because a lack widely recognized homologies. Here, we present newly oral region homologies, based on Universal Elemental Homology model for skeletal plates, in wide range fossil taxa. echinoderms is mainly composed axial, or ambulacral, skeleton, which apparently evolved more slowly than extraxial skeleton that forms...
Abstract Echinoderms are a major group of invertebrate deuterostomes that have been an important component marine ecosystems throughout the P hanerozoic. Their fossil record extends back to C ambrian, when several disparate groups appear in different palaeocontinents at about same time. Many these early forms exhibit character combinations differ radically from extant taxa, and thus their anatomy phylogeny long controversial. Deciphering earliest evolution echinoderms therefore requires...
Some aspects on the age and correlation of upper Barremian-lower Aptian stratigraphic units NW Maestrat Basin were uncertain prior to this study, due differing lithostratigraphy marginal Oliete subbasin compared more depocentral Galve Morella subbasins. New magnetostratigraphic, ammonite sedimentological data presented in study refine sequence stratigraphy succession, enabling a direct precise across these Three third-order TR sequences are identified. The lower boundary Sequence 1...
Abstract Jurassic cyrtocrinids from Spain are first documented here as representing relatively diverse assemblages the western Tethys. The species Ascidicrinus pentagonus , Eugeniacrinites cariophilites Gammarocrinites compressus Pilocrinus moussoni Sclerocrinus cf. S . strambergensis and Tetracrinus moniliformis described Oxfordian marl levels belonging to Yátova Formation, around Tosos (Zaragoza, NE Spain). Although based on partially disarticulated material, these fossils preserve cups,...
Abstract The Cambrian edrioasteroid “Totiglobus” spencensis Wen et al., 2019 is redescribed on the basis of a new and exquisitely preserved specimen from Wuliuan Spence Shale Member, Langston Formation (Utah). This occurrence associated with soft-body preservation several invertebrate groups other shelly fossils. description “ T. ” was originally based single poorly specimen. As result, some its features, such as curvature ambulacra morphology floor cover plates, were misinterpreted or...
Feeding arms carrying coelomic extensions of the theca are thought to be unique crinoids among stemmed echinoderms. However, a new two-armed echinoderm from earliest Middle Cambrian Spain displays highly unexpected morphology. X-ray microtomographic analysis its shows they polyplated in their proximal part with dorsal series uniserial elements enclosing large lumen. Distally, arm transforms into more standard biserial structure blastozoan brachiole. Phylogenetic demonstrates that this taxon...
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...
Echinoderms are unique among animal phyla in having a pentaradial body plan, and their fossil record provides critical data on how this novel organization came about by revealing intermediate stages. Here, we report spiral-plated from the early Cambrian of Morocco that is most primitive echinoderm yet discovered. It between helicoplacoids (a bizarre group spiral-bodied echinoderms) crown-group pentaradiate echinoderms. By filling an important gap, reveals common pattern underpins plans two...
Reconstructing the feeding mode of latest common ancestor deuterostomes is key to elucidating early evolution in chordates and allied phyla; however, it debated whether ancestral deuterostome was a tentaculate feeder or pharyngeal filter feeder. To address this, we evaluated hydrodynamics group fossil stem-group echinoderms (cinctans) using computational fluid dynamics. We simulated water flow past three-dimensional digital models Cambrian cinctan range possible life positions, adopting both...
Abstract The Guole biota contains common shelly fossils and some exceptionally well‐preserved soft‐bodied fossils. Stratigraphically, it is located in the mudstones siltstones of Sandu Formation near Town, Jingxi County, Guangxi, South China. It first Furongian (late Cambrian) Burgess Shale‐type found world, thereby filling gap between middle Cambrian Lower Ordovician Lagerstätten. Preliminary studies suggest that includes approximately seven metazoan groups as well algae. These will provide...
Abstract Reconstructing the function and behaviour of extinct groups echinoderms is problematic because there are no modern analogues for their aberrant body plans. Cinctans, an enigmatic group Cambrian echinoderms, exemplify this problem: asymmetrical plan differentiates them from all living species. Here, we used computational fluid dynamics to analyse functional performance cinctans without assuming extant comparative model. Three‐dimensional models six species across cinctan phylogeny...
Research Article| December 12, 2017 QUANTITATIVE ANALYSIS OF REPAIRED AND UNREPAIRED DAMAGE TO TRILOBITES FROM THE CAMBRIAN (STAGE 4, DRUMIAN) IBERIAN CHAINS, NE SPAIN STEPHEN PATES; PATES 1Department of Zoology, University Oxford, OX1 3PS, United Kingdom 2Institute Earth Sciences, Lausanne, CH-1015, Switzerland Search for other works by this author on: GSW Google Scholar RUSSELL D. C. BICKNELL; BICKNELL 3Paleoscience Centre School Environmental and Rural Science, New England, Armidale,...
Gogia parsleyi Zamora sp.nov.and sp. are described from two different echinoderm assemblages, both the middle Cambrian of Murero Formation (Iberian Chains, NE Spain).Gogia is reconstructed and on basis fifteen complete or partial specimens numerous isolated plates.It characterised by spiralled brachioles, simple epispires, sometimes covered stereomic domes tiny cover plates, thecal plates arranged in subregular circlets.This gogiid population comprises juveniles, advanced juveniles mature...
A new cinctan (Protocinctus mansillaensis gen. et sp. nov.), from the early Middle Cambrian of Iberian Chains (north-east Spain), is described with aid X-ray microtomography and three-dimensional computer models. Investigation in this manner was possible because unusual condition fossils, which are preserved as recrystallized calcite. Protocinctus gen nov. possesses an elongate body a single left anterior feeding groove open posterior marginal frame (in ventral view): combination characters...