Jiří Kvaček

Jiří Kvaček
National Museum, Prague, Czech Republic · Department of Palaeontology

Associate professor

About

207
Publications
56,399
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2,572
Citations
Introduction
Jiří Kvaček currently works at the Department of Palaeontology, National Museum, Prague, Czech Republic. Their current project is 'early angiosperms.'
Additional affiliations
March 2018 - present
Charles University in Prague
Position
  • Professor (Associate)
Description
  • Teaching taxonomy and nomenclature in palaeontology, palaeoecology of fossil plants, Mesozoic palaeobotany
January 2003 - February 2018
Charles University in Prague
Position
  • Lectures in palaeoecology of plants, systematics and nomenclature
January 2002 - present
National Museum, Prague, Czech Republic
Position
  • Head of Department

Publications

Publications (207)
Article
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Pseudoasterophyllites cretaceus from the Cenomanian of Bohemia was recently recognized as an angiosperm by association with stamens containing monosulcate pollen of the Tucanopollis type. New material indicates that the stamens were borne in short spikes, with each stamen subtended by a bract, whereas the carpels were solitary and contained a singl...
Article
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The Melbourne Congress of 2011 authorized a Special Committeeon Registration of Algal and Plant Names (including fossils), whichwas established the following year (Wilson in Taxon 61: 878–879.2012). Its explicit mandate was “to consider what would be involved inregistering algal and plant names (including fossils), using a procedureanalogous to tha...
Article
Shoots of cheirolepidiaceous conifers assigned to the fossil genus Frenelopsis are very common in Portuguese Early Cretaceous mesofossil floras. In this study, a new cheirolepidiaceous conifer Frenelopsis antunesii is described from the Lower Cretaceous (upper Aptian –lower Albian) of Figueira da Foz Formation at the Carregueira site, close to the...
Article
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Article
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A specimen of Araucaria fricii is described from the upper part of the Teplice Formation in the Bohemian Cretaceous Basin. It extends the first occurrence of A. fricii from the mid-Coniacian back to the early Coniacian. Found in the Radovesice locality near Kučlín in the northern part of the Czech Republic, it is characterised by a deltoid cone sca...
Article
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Late Cretaceous mesofossils are described from the Zliv-Řídká Blana locality in the South Bohemian Basins, the Czech Republic. Angiosperm remains dominate the fossil assemblage both in terms of taxonomic diversity and quantitatively, with about 65 different species based on about 1,000 specimens of flowers, fruits and seeds. There are surprisingly...
Article
Conservtaion proposal for Steinhauera C.Presl frequently used name of a fossil relative of sweetgum, against Steinhauera Göpp. (fossil Monilophyta).
Article
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Neutron tomographic reconstructions, macrophotography, transmitted light microscopy and fluorescence microscopy are employed to assess the quality of organic preservation, determine organ associations, identify insect damage, and document fungal interactions with selected Santonian–lower Campanian plant fossils from the northern Kristianstad Basin,...
Article
Premise of research. Accumulating data from phylogenetic analyses of living taxa and from paleobotany (pollen, leaves, and floral structures) has greatly improved our understanding of the Cretaceous rise to dominance of the angiosperms. Relatives of the near-basal family Chloranthaceae were conspicuous in the Early Cretaceous. These include female...
Article
A new cheirolepidiaceous conifer Watsoniocladus cunhae sp. nov. J.Kvaček et M.M.Mendes is described from the Early Cretaceous of Catefica in the Lusitanian Basin, Estremadura region, western Portugal. The new species Watsoniocladus cunhae has been established based on sterile twigs showing decussately arranged s-shaped leaves equipped with stomata...
Article
The Turonian–Coniacian continental fossil record in Europe is scarce. Here we present a new fossil assemblage of early Coniacian age that was systematically collected from the coal-bearing Gosau Group of the Tiefengraben locality near St. Wolfgang, Austria. The diverse assemblage is composed of at least 60 taxa including sporomorphs and Normapolles...
Book
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This Catalogue is the second revised and expanded edition of the first edition, published in 1997 by J. Kvaček and Straková. The material presented in the original edition was completely nomenclaturally revised and newly photodocumented. This second edition provides as much updated information as it was possible to acquire. The Catalogue includes a...
Article
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The sedimentology, geochemistry and paleontology of the pelagic upper Campanian Maastrichtian Bozova Formation in the "Mazidag" (Mazıdağı) - Mardin area, SE Turkey, reveal paleoceanographic and paleoecological changes for the first time. A 119.25 m-thick composite stratigraphic section is characterized by alternating marls, clayey limestones, shale...
Article
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ABSTRACT Data of climate-sensitive leaf traits, which are usually collected and analyzed for entire fossil leaf assemblages, also include intraspecific responses to environmental conditions. Intraspecific correlations between climate and leaf traits represent plastic responses on the individual level as well as plasticity caused by genetic differen...
Article
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Nilssonia mirovanae sp. nov. is described from the Late Cretaceous Cenomanian of the Bohemian Cretaceous Basin. It comes from the best-exposed portion of the Peruc-Korycany Formation, in the Pecínov quarry, west of Prague, the Czech Republic. Although preserved only as a fragment of a pinna, it clearly shows haplocheilic stomata. In this paper, we...
Article
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Late Cretaceous plants from the North Sudetic Basin (Lower Silesia, south-western Poland) are reviewed on the basis of megaflora from 17 localities (270 identifiable specimens), mesoflora from two localities, and microflora from four localities. Major sites are Rakowice Małe and Bolesławiec. Eight megafloral assemblages are distinguished (Assemblag...
Article
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Mesofossils from the Upper Cretaceous of Lower Silesia are escribed from the Nowogrodziec Member of the Czerna Formation. The vestigated strata are part of the North Sudetic Synclinorium and are of either late Coniacian or early Santonian age. The flora comprises egaspores of lycophytes, conifer and angiosperm mesofossils, and insect-related fossil...
Article
A new araucariaceous pollen cone Callialastrobus sousai gen. et sp. nov. is described from the Early Cretaceous (late Aptian–early Albian) Catefica mesofossil flora in the Lusitanian Basin, Estremadura region, western Portugal. The material comprises a single dispersed pollen cone showing peltate deltoid microsporophylls arranged in a helix. Each m...
Article
Three types of charcoalified fossil homoxylous woods are described from the Upper Cretaceous of the Bohemian Cretaceous Basin: Podocarpoxylon sp.,?Podocarpoxylon vel Taxodioxylon sp. and Protocupressinoxylon sp. They come from the uppermost part of the Peruc-Korycany Formation, which is mid-Cenomanian in age. Podocarpoxylon sp. shows distinct growt...
Chapter
Flowering plants, the angiosperms, are the most diverse group of plants on our planet. Today, they dominate most vegetation types, but their origin continues to remain a mystery. However, we continue to gain knowledge about their early evolution and history. It seems increasingly probable that their origin is associated with climatic and environmen...
Chapter
Successful evolutionary forms are characterized by their longevity in the fossil record. There are many plant groups that exhibit these traits; here we have selected the ferns as one acknowledged evolutionary model. Ferns are the most successful cryptogamic plants in geologic history and are known from nearly all fossil floras since their first app...
Chapter
Massive changes in terrestrial paleoecology occurred during the Devonian. This period saw the evolution of both seed plants (e.g., Elkinsia and Moresnetia), fully laminate∗ leaves and wood. Wood evolved independently in different plant groups during the Middle Devonian (arborescent lycopsids, cladoxylopsids, and progymnosperms) resulting in the evo...
Article
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Evolution of terrestrial plants, the first vascular plants, the first trees, and then whole forest ecosystems had far reaching consequences for Earth system dynamics. These innovations are considered important moments in the evolution of the atmosphere, biosphere, and oceans, even if the effects might have lagged by hundreds of thousands or million...
Article
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Article
A new small elongate ovuliferous cone, Friisia lusitanica gen. et sp. nov., assigned to the Podocarpaceae is described from the Lower Cretaceous (upper Aptian – lower Albian) of Catefica site near the locality of Torres Vedras in the Estremadura region, western Portugal, based on a single specimen. The new fossil cone Friisia lusitanica shows decus...
Article
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A preliminary revision of the palynological collection of Professor Blanka Pacltová was carried out considering samples from the middle Cenomanian of the Peruc-Korycany Formation, the basal most member of the Bohemian Cretaceous Basin (the Czech Republic). This collection is mainly composed of slides with palynological residues for light microscope...
Article
Flowers and fruits of Zlivifructus microtriasseris, originally described as Caryanthus microtriasseris from the late Turonian to Santonian of the South Bohemian Basins and the late Coniacian to early Santonian of the North Sudetic Basin, are reinterpreted here. Zlivifructus microtriasseris is represented by small, flat fruits, round in outline with...
Article
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A new fossil conifer Araucaria rothwellii J.Kvaček from the Campanian-Maastrichtian marine sediments of the Bozova Formation in southeastern Turkey is described based on leaf compressions and leaf impressions. The new species is characterized by twigs possessing helically arranged broadly lanceolate leaves with attenuate apexes and slightly narrowe...
Article
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Hazards and disasters have occurred throughout Earth's History and thus the geological record is an important resource for understanding future hazards and disasters and its Impact. The Earth Science Group (ESG) of the Consortium of European Taxonomic Facilities (CETAF) carried out a “Hazard and Disaster Event Survey” to identify Earth Science coll...
Article
Leaves are the most appropriate plant organs for studying adaptations to environmental changes as they are the locations of photosynthetic metabolism and thus directly exposed to habitat conditions. Besides investigations on complete assemblages, individual long-ranging species could directly mirror adaptations and changes of leaf traits on environ...
Article
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Micro-computed tomography (micro-CT or microtomography) is a non-destructive imaging technique using X-rays which allows the digitisation of an object in three dimensions. The ability of micro-CT imaging to visualise both internal and external features of an object, without destroying the specimen, makes the technique ideal for the digitisation of...
Article
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Hazards and disasters have occurred throughout Earth's History and thus the geological record is an important resource for understanding future hazards and disasters. The Earth Science Group (ESG) of the Consortium of European Taxonomic Facilities (CETAF) carried ‡ § | ¶ # ¤ «,» ˄ ˅ ‡ ¦ ‡ © Tilley L et al. This is an open access article distributed...
Article
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Plant mega- and microfossils are described from the middle Sheinwoodian of the Barrandian area. The material comes from the Loděnice locality and the same horizon as the earliest unequivocal land plant, Cooksonia barrandei LIBERTÍN, J.KVAČEK, BEK, ŽÁRSKÝ et ŠTORCH. Its age (432 Myr) is inferred from the associated graptolite fauna, including the zo...
Article
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Several mesofossil fl oras discovered in the Early Cretaceous rocks from the Lusitanian Basin of western Portugal comprise numerous well-preserved conifer remains. Here we report the occurrence of four conifer types in the mesofossil flora from the Catefi ca locality, about 4 km south of Torres Vedras in the Estremadura region on the western Portug...
Article
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In this contribution, plant mega- and meso- fossils from the Peruc-Korycany Formation of the eastern part of the Bohemian Cretaceous Basin are described. They come from ocalities near the villages of Perálec (temporary outcrop of a sewage treatment plant west of the village) and Doly u Luže permanent outcrop in steep bank of a creek running through...
Article
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The Cupressaceae conifer Stutzeliastrobus bohemicus (Bayer) J.Kvaček comb. nov. is described from the Cenomanian Peruc-Korycany Formation of the Bohemian Cretaceous Basin. It is characterised by elongate ovuliferous cones with helically arranged thin, bilaterally symmetrical ovuliferous bract-scale complexes, bearing two to four winged elongate ovo...
Article
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The Cupressaceae conifer Stutzeliastrobus bohemicus (Bayer) J.Kvaček comb. nov. is described from the Cenomanian Peruc-Korycany Formation of the Bohemian Cretaceous Basin. It is characterised by elongate ovuliferous cones with helically arranged thin, bilaterally symmetrical ovuliferous bract-scale complexes, bearing two to four winged elongate ovo...
Article
Araucarian pollen cones Rabagostrobus hispanicus gen. et sp. nov. and their associated foliage Brachyphyllum obesum Heer are described from Lower Cretaceous (Albian) strata of northern Spain. Male cones consist of helically arranged microsporophylls bearing 5–8 elongate pollen sacs with in situ inaperturate Araucariacites‐type pollen. The new taxon...
Article
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The colonization of land by vascular plants is an extremely important phase in Earth’s life history. This key evolutionary process is thought to have begun during the Middle Cambrian1 period and culminated in the Silurian/Early Devonian period (interval about 509–393 million years ago (Ma)), and is documented primarily by microfossils (that is, by...
Article
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Morphometric characters of fossil leaves such as size and shape are important and widely used sources for reconstructing palaeoenvironments. Various tools, including CLAMP or Leaf Margin Analysis, utilize leaf traits as input parameters for estimating palaeoclimate, mostly based on correlations between traits and climate parameters of extant plants...
Article
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An anatomically preserved fossil fruit Allericarpus parvivalvis (Bayer) J. Kvaček et Heřmanová comb. nov. is described from the Coniacian of Březno (Březno Formation), from the Bohemian Cretaceous Basin. Its morphology is characterised based on x-ray and SEM studies. It shows a pentamerous fruit consisting of loculicidally dehiscent capsules. The f...
Article
Computed tomography provides 3D information of inner structures of investigated objects. The obtained information is, however, strongly dependent on the used radiation type. It is known that as X-rays interact with electron cloud and neutrons with atomic nucleus, the obtained data often provide different contrast of sample structures. In this work...
Article
New Normapolles reproductive structures are described from several Late Cretaceous stratigraphic horizons of central and western Europe: the Klikov Formation (late Turonian–Santonian), the Aachen Formation (Santonian) and the Walbeck Formation (Maastrichtian). They are assigned to a new genus, Zlivifructus, containing three new species, Zlivifructu...
Article
Numerous data based on extant vegetation reveal global patterns of relationships between functional leaf traits and climate. Leaf life span (LLS), i.e. evergreen vs. deciduous leaves, represents a central parameter linking functional traits related to the global leaf economics spectrum. Paleogene climate transitions are therefore expected to be ref...
Article
Photon counting detectors Timepix are known for their unique properties enabling X-ray imaging with extremely high contrast-to-noise ratio. Their applicability has been recently further improved since a dedicated technique for assembling large area Timepix detector arrays was introduced. Despite the fact that the sensitive area of Timepix detectors...
Article
Revision of part of the Middle Jurassic flora of Sardinia, the Krasser collection, stored in Prague (Lovisato B collection), containing 23 fossil taxa of horsetails, ferns, cycadophytes, ginkgophytes and conifers. The conifers are most diverse, followed by cycadophytes and ferns. The composition of this assemblage differs notably from the Lovisato...
Data
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Article
Using dedicated contrast agents high-quality X-ray imaging of soft tissue structures with isotropic micrometre resolution has become feasible. This technique is frequently titled as virtual histology as it allows production of slices of tissue without destroying the sample. The use of contrast agents is, however, often an irreversible time-consumin...
Article
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The “Chlomek Beds” (an informal designation of the psammitic facies of the Březno Formation, north-eastern part of the Bohemian Cretaceous Basin) yielded a poorly preserved megaflora, dated as Coniacian on the basis of co-occurring inoceramid bivalves. The flora is interpreted to have grown on the West Sudetic Island, a palaeohigh of the Central Eu...
Article
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The Special Committee on Registration of Algal and Plant Names (including fossils) was established at the XVIII International Botanical Congress (IBC) in Melbourne in 2011, its mandate being to consider what would be involved in registering algal and plant names (including fossils), using a procedure analogous to that for fungal names agreed upon i...
Technical Report
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SYNTHESYS3 consortium recognises the importance of the Societal Challenges identified by the Horizon2020 programme and relevance of natural history collections for solving problems outside the traditional and conventional fields. We have reviewed 26 Use Cases backed up by documentary evidence demonstrating how the collections, expertise and service...
Research
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Old mine works was examined near Vojnův Městec (Bohemian-Moravian Highlands, Eastern Bohemia). The mine was founded around 1844-1845 (according dendrochronological dating) due to prospected layers of cretaceous coal claystones. These sediments were deposited in predominantly freshwater environment during younger middle Cenomanian due to angiospermo...
Article
Genus Caryanthus with fourteen species represents the most diversified genus in the Normapolles complex. Detailed review of material from Central Europe allowed accurate study of its geographic and stratigraphic distribution. An emended diagnosis of Caryanthus communis Knobloch et Mai, Caryanthus deltoides (Knobloch) Friis, Caryanthus microtriasser...