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| rdf:type
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| Description
| - Crystallographic textures and microstructures of molluscan shells may provide information of pivotal value for phylogenies. To fill a gap in our knowledge on the crystallographic textures of fossil molluscs, we have applied the X-ray oblique-texture diffraction to the examination of nacreous layers in fossil members of the classes Gastropoda and Cephalopoda. Previous studies of nacre in living cephalopods revealed a different crystallographic texture: perfect preferred orientation of all axes providinga single crystal-like X-ray pattern. This was interpreted as evidence for unrelated origin of nacre in the classes Gastropoda and Cephalopoda. Our data on fossil cephalopod nacre, however, contradicts that interpretation. We found gastropod-type nacre in Mesozoic members of suborders Ceratitina, Ammonitina, and Phylloceratina (order Ammonoidea). Thus the columnar nacre of gastropods and cephalopods may be homologous whereas Nautilus-type nacre may be an evolutionary novelty in the class Cephalopoda.
- Crystallographic textures and microstructures of molluscan shells may provide information of pivotal value for phylogenies. To fill a gap in our knowledge on the crystallographic textures of fossil molluscs, we have applied the X-ray oblique-texture diffraction to the examination of nacreous layers in fossil members of the classes Gastropoda and Cephalopoda. Previous studies of nacre in living cephalopods revealed a different crystallographic texture: perfect preferred orientation of all axes providinga single crystal-like X-ray pattern. This was interpreted as evidence for unrelated origin of nacre in the classes Gastropoda and Cephalopoda. Our data on fossil cephalopod nacre, however, contradicts that interpretation. We found gastropod-type nacre in Mesozoic members of suborders Ceratitina, Ammonitina, and Phylloceratina (order Ammonoidea). Thus the columnar nacre of gastropods and cephalopods may be homologous whereas Nautilus-type nacre may be an evolutionary novelty in the class Cephalopoda. (en)
- Crystallographic textures and microstructures of molluscan shells may provide information of pivotal value for phylogenies. To fill a gap in our knowledge on the crystallographic textures of fossil molluscs, we have applied the X-ray oblique-texture diffraction to the examination of nacreous layers in fossil members of the classes Gastropoda and Cephalopoda. Previous studies of nacre in living cephalopods revealed a different crystallographic texture: perfect preferred orientation of all axes providinga single crystal-like X-ray pattern. This was interpreted as evidence for unrelated origin of nacre in the classes Gastropoda and Cephalopoda. Our data on fossil cephalopod nacre, however, contradicts that interpretation. We found gastropod-type nacre in Mesozoic members of suborders Ceratitina, Ammonitina, and Phylloceratina (order Ammonoidea). Thus the columnar nacre of gastropods and cephalopods may be homologous whereas Nautilus-type nacre may be an evolutionary novelty in the class Cephalopoda. (cs)
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| Title
| - Discovery of gastropod-type nacre in fossil cephalopods: a tale of two crystallographic textures
- Discovery of gastropod-type nacre in fossil cephalopods: a tale of two crystallographic textures (en)
- Discovery of gastropod-type nacre in fossil cephalopods: a tale of two crystallographic textures (cs)
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| skos:prefLabel
| - Discovery of gastropod-type nacre in fossil cephalopods: a tale of two crystallographic textures
- Discovery of gastropod-type nacre in fossil cephalopods: a tale of two crystallographic textures (en)
- Discovery of gastropod-type nacre in fossil cephalopods: a tale of two crystallographic textures (cs)
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| skos:notation
| - RIV/00025798:_____/04:00000165!RIV/2005/GA0/N03005/N
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| http://linked.open.../vavai/riv/strany
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/00025798:_____/04:00000165
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...v/mistoKonaniAkce
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| http://linked.open...i/riv/mistoVydani
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| http://linked.open...i/riv/nazevZdroje
| - World Congress of Malacology, Perth 2004, Western Australia, F. E. Wells (ed.)
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
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| http://linked.open...UplatneniVysledku
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| http://linked.open...iv/tvurceVysledku
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| http://linked.open...vavai/riv/typAkce
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| http://linked.open.../riv/zahajeniAkce
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| number of pages
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| http://purl.org/ne...btex#hasPublisher
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| https://schema.org/isbn
| |
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