Discovery of gastropod-type nacre in fossil cephalopods: a tale of two crystallographic textures

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F04%3A00000165" target="_blank" >RIV/00025798:_____/04:00000165 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Discovery of gastropod-type nacre in fossil cephalopods: a tale of two crystallographic textures

Original language 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 providingasingle 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 inMesozoic 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 C

Czech name

Discovery of gastropod-type nacre in fossil cephalopods: a tale of two crystallographic textures

Czech 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 providingasingle 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 inMesozoic 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 C

Type

D - Article in proceedings

CEP classification

DB - Geology and mineralogy

OECD FORD branch

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Project

<a href="/en/project/GA205%2F04%2F0600" target="_blank" >GA205/04/0600: Microstructures and crystallographic textures of molluscan shells as phylogenetic indicators: a study of fossil gastropods and cephalopods</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2004

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

World Congress of Malacology, Perth 2004, Western Australia, F. E. Wells (ed.)

ISBN

1920843124

ISSN

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e-ISSN

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Number of pages

1

Pages from-to

43-43

Publisher name

Neuveden

Place of publication

Perth

Event location

Perth

Event date

Jan 1, 2004

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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