Minute Silurian oncocerid nautiloids with unusual colour patterns

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F09%3A00000148" target="_blank" >RIV/00025798:_____/09:00000148 - isvavai.cz</a>
Alternative codes found
RIV/00023272:_____/09:#0001101
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Minute Silurian oncocerid nautiloids with unusual colour patterns
Original language description
A minute Silurian oncocerid Cyrtoceras pollux, from Bohemia is assigned here to the genus Pomerantsoceras. The only so far known species of this genus comes from Ordovician of Estonia. Pomerantsoceras thus represents, except for un-revised poorly understood taxa, the single known oncocerid genus surviving the end-Ordovician extinction events. Colour pattern characterised by a few longitudinal bands on the entire circumference of the shell is here reported in oncocerids. Longicone and only slightly curved small shells as in Pomerantsoceras are unusual among nautiloids and resemble straight shells of orthocerids and pseudorthocerids, in which the colour pattern consists of straight colour bands. Consequently the shell shape as well as the colour patternshould be regarded as adaptive convergence with orthocerids and pseudorthocerids. It supports the hypothesis that colour pattern functioned as camouflage and its evolution was under adaptive control.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DB - Geology and mineralogy
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2009
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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