Lituitid cephalopods from the upper Darriwilian and basal Sandbian (Middle-Upper Ordovician) of Estonia

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F20%3A10423812" target="_blank" >RIV/00216208:11310/20:10423812 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985831:_____/20:00541391

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=q8EfCNF4NJ" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=q8EfCNF4NJ</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1080/11035897.2020.1762723" target="_blank" >10.1080/11035897.2020.1762723</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Lituitid cephalopods from the upper Darriwilian and basal Sandbian (Middle-Upper Ordovician) of Estonia

Popis výsledku v původním jazyce

Cephalopods of the order Lituitida Starobogatov, 1983 from the late Darriwilian and early Sandbian strata of Estonia are revised herein. During that time, the lituitids reached their peak abundance and were among the key components of cephalopod faunas on Baltica, as well as in other mid- and low-latitude palaeogeographic locations. The Estonian lituitids mostly come from localities representing more off-shore environments with deeper-water sedimentation in the Middle Ordovician. This supports previous assumptions that lituitids preferred pelagic environments and were capable of long-distance migration. In the studied lituitid collection, two genera were identified -LituitesBertrand, 1763 andAncistrocerasBoll, 1857. Three species -Ancistroceras ristnensissp. nov.,Ancistroceras vahikuelaensissp. nov. andLituites nehatuensissp. nov. - were newly established. However, species determinations were often hindered by high intraspecific variability and fragmentary preservation. Investigation of cameral deposits using median sections showed that: connecting rings in chambers with deposits are commonly broken or missing; oriented fragments of connecting rings are present, sometimes overgrown by primary deposits; several generations of primary deposits can be developed; simultaneous presence of both broken and intact connecting rings in the same specimen is usual. These observations elucidate the formation of cameral deposits in lituitids. Currently, this process is explained either by passive deposition from cameral fluids, or active secretion by cameral mantle. The evidence collected herein from Estonian lituitids reveals, however, that both modes of formation might have occurred successively during the lituitid ontogeny and that a gradual, life-time destruction of connecting rings was possibly involved.

Název v anglickém jazyce

Lituitid cephalopods from the upper Darriwilian and basal Sandbian (Middle-Upper Ordovician) of Estonia

Popis výsledku anglicky

Cephalopods of the order Lituitida Starobogatov, 1983 from the late Darriwilian and early Sandbian strata of Estonia are revised herein. During that time, the lituitids reached their peak abundance and were among the key components of cephalopod faunas on Baltica, as well as in other mid- and low-latitude palaeogeographic locations. The Estonian lituitids mostly come from localities representing more off-shore environments with deeper-water sedimentation in the Middle Ordovician. This supports previous assumptions that lituitids preferred pelagic environments and were capable of long-distance migration. In the studied lituitid collection, two genera were identified -LituitesBertrand, 1763 andAncistrocerasBoll, 1857. Three species -Ancistroceras ristnensissp. nov.,Ancistroceras vahikuelaensissp. nov. andLituites nehatuensissp. nov. - were newly established. However, species determinations were often hindered by high intraspecific variability and fragmentary preservation. Investigation of cameral deposits using median sections showed that: connecting rings in chambers with deposits are commonly broken or missing; oriented fragments of connecting rings are present, sometimes overgrown by primary deposits; several generations of primary deposits can be developed; simultaneous presence of both broken and intact connecting rings in the same specimen is usual. These observations elucidate the formation of cameral deposits in lituitids. Currently, this process is explained either by passive deposition from cameral fluids, or active secretion by cameral mantle. The evidence collected herein from Estonian lituitids reveals, however, that both modes of formation might have occurred successively during the lituitid ontogeny and that a gradual, life-time destruction of connecting rings was possibly involved.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

GFF

ISSN

1103-5897

e-ISSN

—

Svazek periodika

142

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

SE - Švédské království

Počet stran výsledku

30

Strana od-do

267-296

Kód UT WoS článku

000547129000001

EID výsledku v databázi Scopus

2-s2.0-85087612097