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Tytuł:
First shark record (Chondrichthyes, Elasmobranchii) from the Paleogene of Spitsbergen, Svalbard
Autorzy:
Mörs, Thomas
Hagström, Jonas
Kaim, Andrzej
Hryniewicz, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2041897.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Paleocene
Grumantbyen Formation
sand tiger shark
tooth morphology
Źródło:
Polish Polar Research; 2019, 40, 2; 121-127
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First record of the deep-water shark Etmopterus spinax (Chondrichthyes: Etmopteridae) from the Southern Baltic Sea (Pomeranian Bay)
Autorzy:
Wiecaszek, B.
Sobecka, E.
Panicz, R.
Keszka, S.
Gorecka, K.
Linowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/48454.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Etmopterus spinax
deep-water shark
Anisakis simplex
Chondrichthyes
Etmopteridae
Pomeranian Bay
Baltic Sea
Źródło:
Oceanologia; 2018, 60, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphology and histology of dorsal spines of the xenacanthid shark Orthacanthus platypternus from the Lower Permian of Texas, USA: palaeobiological and palaeoenvironmental implications
Autorzy:
Beck, K.G.
Soler-Gijon, R.
Carlucci, J.R.
Willis, R.E.
Powiązania:
https://bibliotekanauki.pl/articles/21629.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
morphology
histology
dorsal spine
xenacanthid shark
shark
Orthacanthus platypterus
Chondrichthyes
Xenacanthiformes
Lower Permian
Texas
USA
paleobiology
paleoenvironment
Opis:
Detailed studies on Carboniferous species of the xenacanth Orthacanthus have shown that the xenacanth dorsal fin spine can be used for skeletochronological analyses and provides valuable information about development, growth and environmental life conditions of those extinct sharks. We report here for the first time the histology and skeletochronology of Permian specimens, dorsal spines of Orthacanthus platypternus from the Craddock Bone Bed (lower Clear Fork Formation; Early Permian, Leonardian age) of northern Baylor County (north-central Texas, USA). Twelve dorsal spines of O. platypternus preserve a highly vascularized wall mainly composed of centrifugally growing dentine in a succession of dentine layers, probably deposited with an annual periodicity. As expected, spines of individuals with 1–2 dentine layers, presumably juveniles, present the smallest sizes. However, spines of individuals showing at least 3–4 dentine layers and interpreted to be subadults/young adults, are distributed in two spine-size clusters corresponding to females (probably the largest spines) and males, in agreement with the hypothesis of sexual size dimorphism proposed in a previous biometric analysis. Our comparative study of O. platypternus and the Stephanian species O. meridionalis further suggests that spine denticulation can be useful for distinguishing between species of Orthacanthus and sexually dimorphic forms (juvenile to adults) in each species. Total body length estimations of O. platypternus from the Craddock Bone Bed point to relatively large juveniles and small subadults/young adults (less than 2 m in total length), living as opportunistic predators in the pond-channel coastal plain environments represented by the bone bed deposits. The comparative analyses of the ontogenetic stages of the recorded specimens of O. platypternus and their distribution along different facies and localities indicate that this species was euryhaline, diadromous with a catadromous life-cycle which was strongly regulated by the semi-arid, seasonally dry tropical climate affecting western Pangaea during the Early Permian.
Źródło:
Acta Palaeontologica Polonica; 2016, 61, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A partial skeleton of a new lamniform mackerel shark from the Miocene of Europe
Autorzy:
Kriwet, J.
Mewis, H.
Hampe, O.
Powiązania:
https://bibliotekanauki.pl/articles/20139.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
skeleton
new species
lamniform mackerel shark
Miocene
Europe
Chondrichthyes
Lamniformes
Lamnidae
Carcharomodus
postcranium
Langenfeldian
Germany
Opis:
Cenozoic lamniform sharks are mostly represented by isolated teeth and vertebrae, whereas articulated skeletal remains are usually very scarce. Here, we describe a partial skeleton of an extinct lamniform shark consisting of 42 slightly disarticulated teeth, 49 vertebrae, and additional unidentifiable cranial and postcranial remains. The specimen originates from the Miocene mica-clay of Groß Pampau (North Germany), which is of late Langenfeldian age (= Serravallian-Tortonian boundary; middle-late Miocene). A total of 13 measurements of each tooth, as well as morphological features, were used to reconstruct the dentition of this specimen and to provide detailed taxonomic information. Additionally, the total body size and age at death were established using methodologies based on vertebral and tooth measurements and vertebral centra growth ring counts, respectively. The specimen undoubtedly represents the most complete individual of "Carcharodon (= Isurus) escheri", previously known only from a few isolated teeth. The dental pattern (e.g., marked dignathic and monognathic heterodonty patterns; only slightly labio-lingually compressed upper teeth; upper teeth slender with distally inclined or curved main cusps; massive, hook-like upper intermediate tooth; main cusps with crenulated cutting edges; lateral cusplets in teeth of all ontogenetic stages) clearly separates this shark from all hitherto known Cenozoic and Recent lamnids and a new genus, Carcharomodus, consequently is introduced. Carcharomodus escheri comb. nov. is a characteristic element of late early Miocene to the Pliocene Western and Central European fish faunas. All previously identified Pacific occurrences represent a different taxon. We estimate that the specimen had a total body length of about 4 m and that it was older than 10 years and thus might have reached maturity before death, as indicated by all available evidence.
Źródło:
Acta Palaeontologica Polonica; 2015, 60, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vertebral morphology, dentition, age, growth, and ecology of the large lamniform shark Cardabiodon ricki
Autorzy:
Newbrey, M.G.
Siversson, M.
Cook, T.D.
Fotheringham, A.M.
Sanchez, R.L.
Powiązania:
https://bibliotekanauki.pl/articles/21003.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
morphology
dentition
age
growth
ecology
large lamniform shark
Cardabiodon ricki
Cardabiodon venator
Chondrichthyes
Lamniformes
Archaeolamna
Squalicorax
Cretaceous
Cenomanian
Turonian
Australia
Opis:
Cardabiodon ricki and Cardabiodon venator were large lamniform sharks with a patchy but global distribution in the Cenomanian and Turonian. Their teeth are generally rare and skeletal elements are less common. The centra of Cardabiodon ricki can be distinguished from those of other lamniforms by their unique combination of characteristics: medium length, round articulating outline with a very thick corpus calcareum, a corpus calcareum with a laterally flat rim, robust radial lamellae, thick radial lamellae that occur in low density, concentric lamellae absent, small circular or subovate pores concentrated next to each corpus calcareum, and papillose circular ridges on the surface of the corpus calcareum. The large diameter and robustness of the centra of two examined specimens suggest that Cardabiodon was large, had a rigid vertebral column, and was a fast swimmer. The sectioned corpora calcarea show both individuals deposited 13 bands (assumed to represent annual increments) after the birth ring. The identification of the birth ring is supported in the holotype of Cardabiodon ricki as the back-calculated tooth size at age 0 is nearly equal to the size of the smallest known isolated tooth of this species. The birth ring size (5-6.6 mm radial distance [RD]) overlaps with that of Archaeolamna kopingensis (5.4 mm RD) and the range of variation of Cretoxyrhina mantelli (6-11.6 mm RD) from the Smoky Hill Chalk, Niobrara Formation. The revised, reconstructed lower jaw dentition of the holotype of Cardabiodon ricki contains four anterior and 12 lateroposterior files. Total body length is estimated at 5.5 m based on 746 mm lower jaw bite circumference reconstructed from associated teeth of the holotype.
Źródło:
Acta Palaeontologica Polonica; 2015, 60, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deep water chondrichthyans from the Early Miocene of the Vienna Basin (Central Paratethys, Slovakia)
Autorzy:
Underwood, C.J.
Schlogl, J.
Powiązania:
https://bibliotekanauki.pl/articles/22804.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Squaliformes
Dalatidae
Etmopteridae
Pristiophorus
shark
Miocene
Slovakia
Paratethys
chondrichthyan
Early Miocene
Vienna Basin
Opis:
Sampling of latest Burdigalian (Miocene) silty clays from the Malé Karpaty Mountains in the Slovakia revealed a deep−water, low diversity shark fauna. The fauna is dominated by teeth of very small squaliform sharks, including two new species, Eosqualiolus skrovinai sp. nov. and Paraetmopterus horvathi sp. nov. The generic composition of the squaliform fauna is more similar to that known from the Eocene than that of today, suggesting a post–early Miocene faunal turnover within this clade, at least locally. Nectobenthic, non squaliform sharks are rare, but include the new sawshark species Pristiophorus striatus sp. nov., while minute teeth of an enigmatic taxon described here as Nanocetorhinus tuberculatus gen. et sp. nov. probably indicate the presence of a previously unrecorded planktivore. The unusual composition of the fauna, with the complete absence of taxa known to be of medium to large size, suggests an unusual, and probably very stressed, palaeoenvironment.
Źródło:
Acta Palaeontologica Polonica; 2013, 58, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From Figurative Representations to Metaphoric Deformations: The Iconic Text Layout in Contemporary Narrative Fiction in English
Od przedstawień figuratywnych do metaforycznych zniekształceń. Ikoniczny układ graficzny tekstu we współczesnej prozie anglojęzycznej
Autorzy:
Maziarczyk, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/1901863.pdf
Data publikacji:
2012
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
układ graficzny tekstu na stronie
ikoniczność
semiotyzacja
Pożeracz myśli
Albert Angelo
Podwójna wygrana jak nic
text layout
iconicity
semiotisation
The Raw Shark Texts
Double or Nothing
Opis:
Celem artykułu jest analiza procesu semiotyzacji układu graficznego tekstu w prozie narracyjnej i wykazanie, że różne konfiguracje grafemów mogą być skorelowane z głównymi typami ikoniczności wyróżnianymi w badaniach semiotycznych. Figuratywne przedstawienie typograficzne rekina-pożeracza myśli w powieści Pożeracz myśli Stevena Halla jest przykładem obrazowego znaku ikonicznego, który odzwierciedla jego szczególny status ontologiczny. Równoległe kolumny tekstu wykorzystane w powieści B. S. Johnsona Albert Angelo można zinterpretować jako diagramatyczne przedstawienie procesów zachodzących jednocześnie na poziomie świata przedstawionego. Z kolei w powieści Podwójna wygrana jak nic Raymonda Federmana nagromadzenie zniekształceń typograficznych, które obejmują zarówno ostentacyjnie ikoniczne formy, jak również czysto arbitralne układy tekstu, stanowi złożoną metaforę ikoniczną procesu twórczego. Podczas gdy struktura diagramatyczna wykorzystana w powieści Albert Angelo przekazuje znaczenie jedynie za pomocą środków typograficznych, pozostałe dwie powieści opierają się na nieuniknionej wzajemnej zależności między ikonicznym i symbolicznym trybem tworzenia znaczeń.
This essay seeks to analyse semiotisation of layout in narrative fiction and to demonstrate that various configurations of graphemes can be correlated with major types of iconicity distinguished in semiotic studies. The figurative typographic representation of the eponymous shark in Steven Hall’s The Raw Shark Texts is as an instance of imagic icon, reflecting its peculiar ontological status. The parallel columns exploited in B. S. Johnson’s Albert Angelo can be interpreted as a diagrammatic representation of processes happening simultaneously on the level of the presented world. Finally, in Raymond Federman’s Double or Nothing the abundance of diverse typographic deformations, which vary from ostentatiously iconic to purely arbitrarily forms, constitutes a complex iconic metaphor of the creative process. Significantly, while the diagrammatic arrangement employed in Albert Angelo conveys its meaning via the typographic means only, the other two novels rely on the inevitable interplay between iconic and symbolic modes of signification.
Źródło:
Roczniki Humanistyczne; 2012, 60, 5; 179-196
0035-7707
Pojawia się w:
Roczniki Humanistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oxygen isotope analysis of shark teeth phosphates from Bartonian (Eocene) deposits in Mangyshlak peninsula, Kazakhstan
Autorzy:
Pelc, Andrzej
Hałas, Stanisław
Niedźwiedzki, Robert
Powiązania:
https://bibliotekanauki.pl/articles/2086485.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
Bartonian
carbonate
Mangyshlak peninsula
phosphate
shark teeth
δ18O
δ13C
Opis:
We report the results of high-precision (±0.05‰) oxygen isotope analysis of phosphates in 6 teeth of fossil sharks from the Mangyshlak peninsula. This precision was achieved by the offline preparation of CO2 which was then analyzed on a dual-inlet and triple-collector IRMS. The teeth samples were separated from Middle- and Late Bartonian sediments cropping out in two locations, Usak and Kuilus. Seawater temperatures calculated from the δ18O data vary from 23–41oC. However, these temperatures are probably overestimated due to freshwater inflow. The data point at higher temperature in the Late Bartonian than in the Middle Bartonian and suggest differences in the depth habitats of the shark species studied.
Źródło:
Mineralogia; 2011, 42, 1; 53--61
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oxygen isotope analysis of shark teeth phosphates from Bartonian (Eocene) deposits in Mangyshlak peninsula, Kazakhstan
Autorzy:
Pelc, A.
Hałas, S.
Niedźwiedzki, R.
Powiązania:
https://bibliotekanauki.pl/articles/2086536.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
Bartonian
carbonate
Mangyshlak peninsula
phosphate
shark teeth
δ18O
δ13C
Opis:
We report the results of high-precision (±0.05‰) oxygen isotope analysis of phosphates in 6 teeth of fossil sharks from the Mangyshlak peninsula. This precision was achieved by the offline preparation of CO2 which was then analyzed on a dual-inlet and triple-collector IRMS. The teeth samples were separated from Middle- and Late Bartonian sediments cropping out in two locations, Usak and Kuilus. Seawater temperatures calculated from the δ18O data vary from 23–41oC. However, these temperatures are probably overestimated due to freshwater inflow. The data point at higher temperature in the Late Bartonian than in the Middle Bartonian and suggest differences in the depth habitats of the shark species studied.
Źródło:
Mineralogia; 2011, 42, 1; 53--61
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological systems of surfaces with frictional resistance reduction
Autorzy:
Wierzcholski, K.
Miszczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/247630.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
nano-ridges
groove geometry
reduced friction
micro-bearing
shark skin
Opis:
In this paper are assumed micro-ridges and micro-grooves on the Journal and bearing sleeve surfaces. Friction on the boundary layer of the body moving in the oil at high Reynolds numbers may be decreased due to such asculpturing of the surface. The grooved scale of the shark skin is an example of such tribological systems. There size ranges of the grooves are from 200 jum to 400/jm. The surface of the each scale contains parallel groove between so-called ribbed directed almost parallel to the longitudinal body axis. An explanation of the shark skin effect has been proposed recently for the micro-bearing surfaces shapes execution. In the boundary layer, not only longitudinal micro-turbulence but also cross-directed micro-turbulence occurs. The longitudinal grooves of the shark and bearing surface prevent the appearance of the cross-directed micro-turbulences. Forces of the streaming oil in bearing or micro-bearing gap act on the bearing surface in two different ways. On one side, the oil generates the pressure directed normally to the surface of the Journal surface and is responsible for inertiaforces. On the other side, friction or shearing force acts tangentially to the bearing surface. The resulting force depends on the geometry of the body, its relative dimensions to the oilflow and on such characteristics of the oil as its density, viscosity and velocity.
Źródło:
Journal of KONES; 2010, 17, 3; 491-496
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Oligocene sharks and rays from the Chandler Bridge Formation, Dorchester County, South Carolina, USA
Autorzy:
Cicimurri, D.J.
Knight, J.L.
Powiązania:
https://bibliotekanauki.pl/articles/21710.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Late Oligocene
Oligocene
shark
ray
Chandler Bridge Formation
Dorchester County
South Carolina
USA
Chondrichthyes
Neoselachii
Opis:
A diverse vertebrate fauna, dominated by elasmobranch taxa, was collected from the upper Oligocene (Chattian) Chandler Bridge Formation in Summerville, Dorchester County, South Carolina. Nearly 3,500 teeth and dermal denticles are assigned to 29 species of sharks and rays, and our sample includes the oldest known occurrence of the whale shark, Rhincodon, as well as a new skate, Raja mccollumi sp. nov. The Chandler Bridge elasmobranch assemblage is comparable in species diversity to Chattian assemblages of Virginia and North Carolina, USA, and Germany. Notable absences from Germany include Rhincodon, Hemipristis, and Sphyrna zygaena, likely reflecting the influence of colder water on the North Sea Basin during the Chattian. Squaloids, pristiophoroids, and hexanchoids are known from Chattian deposits of the Albemarle Embayment (North Carolina), Salisbury Embayment (Virginia), and North Sea Basin, but these taxa are absent from the Chandler Bridge assemblage, perhaps because of shallow, warm water (20 to 25°C) conditions within the more southerly Charleston Embayment.
Źródło:
Acta Palaeontologica Polonica; 2009, 54, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New ichnotaxa based on tooth impressions on dinosaur and whale bones
Autorzy:
Jacobsen, Aa. R.
Bromley, R. G.
Powiązania:
https://bibliotekanauki.pl/articles/2059250.pdf
Data publikacji:
2009
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
bite trace
bone substrate
shark
Linichnus serratus
theropod
Knethichnus parallelum
Opis:
Traces produced by teeth on bones provide a source of information on the feeding behaviour, predator-prey relationships, and tooth morphology of the tracemaking carnivores and scavengers involved. Studies on mammals, both fossil and recent, have used tooth-scratched bones as clues to the feeding behaviour of carnivorous, scaveng ing, mineral-seeking and tooth-sharpening mammals in various ecosystems. Similarly, theropod tooth traces have the potential of being important for studying the ecology and ethology of both carnivorous and herbivorous dinosaurs. This paper augments the ichnological nomenclature for traces made by teeth on bones. Two new ichnogenera and ichnospecies, Linichnus serratus and Knethichnus parallelum, are introduced on the basis of the morphology of theropod biting damage, to focus on the resulting trace fossils as an ichnological feature and to encourage further observation and studies of distrtibution. Using similar ichnological terminology for both theropod and mammalian feeding traces, and even those of selachian sharks preying on whales or scavenging their corpses, will help coordinate biting strategies, jaw mechanism and feeding behaviour for both recent and ancient carnivores and scavengers.
Źródło:
Geological Quarterly; 2009, 53, 4; 373-382
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New fossil triakid sharks from the early Eocene of Premontre, France, and comments on fossil record of the family
Autorzy:
Adnet, S
Cappetta, H.
Powiązania:
https://bibliotekanauki.pl/articles/21991.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Gomphogaleus
Galeorhinus
Early Eocene
fossil shark
paleontology
Triakidae
Premonte
Chondrichthyes
Eocene
France
new fossil
triakid shark
Opis:
During the last two decades, an abundant selachian assemblage has been collected from the late Ypresian (NP12) fossiliferous sands of Prémontré (Aisne, northern France) but has received little attention. Sharks of the family Triakidae (Carcharhiniformes) are particularly well represented and all are described and figured herein. Among them, two new species of the genus Galeorhinus are described: G. duchaussoisi sp. nov. and G. louisi sp. nov.; these are compared to the common Paleogene G. ypresiensis which is refigured. Another triakid taxon, the genus Gomphogaleus gen. nov., is described. Most of the triakids have been recorded elsewhere in the North Atlantic region, suggesting a wider distribution than expected for these small sharks during the Paleogene. The present paper updates the list of selachians from Prémontré, bringing the number of taxa from 19 to 33 (including 22 sharks and 11 batoids) and improving our knowledge of the ancient North Atlantic Ypresian selachian fauna. Despite this vastly improved record, it is clear that fossil data are still very incomplete and insufficient for calibrating phylogenetic hypotheses of living forms. Review of the Prémontré fauna shows that the Triakidae were much more diverse and broadly distributed than at present, suggesting that the limited distribution and low diversity of living forms is probably a recent phenomenon.
Źródło:
Acta Palaeontologica Polonica; 2008, 53, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
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