Embryonic shells in some lechritrochoceratids (Nautiloidea, Barrandeocerina)

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F10%3A%230001319" target="_blank" >RIV/00023272:_____/10:#0001319 - 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
Embryonic shells in some lechritrochoceratids (Nautiloidea, Barrandeocerina)
Original language description
Knowledge on the early ontogeny of lechritrochoceratids (Tarphycerida, Barrandeocerina), possible ancestors of Nautilida, is extended expanded. The outer morphology of the embryonic shell in Kosovoceras sandbergeri (Barrande, 1865), Peismoceras pulchrum(Barrande 1865), Calocyrtoceras cognatum (Barrande, 1866) and C. simulans (Barrande, 1865) is described; the systematic position of Calocyrtoceras within this group is substantiated. Common features of these nautiloids are cyrtocone shells, a bowl-shapedblunt apex, the absence of nepionic constriction and a reticulate sculpture with dominating longitudinal lirae. The appearance of annuli on the surface is interpreted as the beginning of post-hatching phase. The embryonic shell of the Silurian tarphycerid Boionautilus bohemicus (Barrande, 1865) from the family Uranoceratidae is discussed for a comparison.
Czech name
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Czech description
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Project
<a href="/en/project/DE06P04OMG009" target="_blank" >DE06P04OMG009: Sceintific and muzeological revision and documentation of selected parts of type material from the collectios of the Paleontological department of the National Museum, Prague</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2010
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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