Monospecific mass associations of Anaconularia anomala (Cnidaria, Scyphozoa) from the Upper Ordovician of the Czech Republic: sedimentological and palaeobiological signifikance

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F22%3A00560859" target="_blank" >RIV/67985891:_____/22:00560859 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.18261/let.55.2.7" target="_blank" >https://doi.org/10.18261/let.55.2.7</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.18261/let.55.2.7" target="_blank" >10.18261/let.55.2.7</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Monospecific mass associations of Anaconularia anomala (Cnidaria, Scyphozoa) from the Upper Ordovician of the Czech Republic: sedimentological and palaeobiological signifikance

Popis výsledku v původním jazyce

Five quartzose sandstone slabs hosting small groups or mass associations of Anaconularia anomala are described from the Upper Ordovician Letna Formation in the Prague Basin. The slabs contain from 4 to 59, mutually adjacent or contiguous conulariids ranging from 5 to 89 mm in length and situated on a single bedding plane. Associated with the conulariids are small mudstone intraclasts and other fossils, mostly disarticulated brachiopods and trilobites. All 101 studied conulariid specimens are oriented parallel to bedding and show strong preferential alignment, with the apical ends pointing in the same general direction. Sixteen of the conulariids terminate adapically in a probabe schott and/or exhibit a possible internal schott, while five specimens preserve one or two apertural lappets. The investigated conulariids lived in clumps and were buried catastrophically following alignment by unidirectional currents or flows acting on bodies that may have been leaning in the down-current direction and/or which had their center of mass displaced toward their apical end. Neither these nor 3000 additional specimens of A. anomala from the Sandbian Letna and Zahorany formations show any evidence of clonal budding, however, the hypothesis that clumping resulted from asexual proliferation cannot be ruled out. Finally, the periderm of A. anomala was compaction-resistant and smooth, lacking both corrugation (transverse ribs) and nodes, but whether the angular groove present at the facial midline of casts is a mould of a midline sulcus or of an internal carina remains unclear.

Název v anglickém jazyce

Monospecific mass associations of Anaconularia anomala (Cnidaria, Scyphozoa) from the Upper Ordovician of the Czech Republic: sedimentological and palaeobiological signifikance

Popis výsledku anglicky

Five quartzose sandstone slabs hosting small groups or mass associations of Anaconularia anomala are described from the Upper Ordovician Letna Formation in the Prague Basin. The slabs contain from 4 to 59, mutually adjacent or contiguous conulariids ranging from 5 to 89 mm in length and situated on a single bedding plane. Associated with the conulariids are small mudstone intraclasts and other fossils, mostly disarticulated brachiopods and trilobites. All 101 studied conulariid specimens are oriented parallel to bedding and show strong preferential alignment, with the apical ends pointing in the same general direction. Sixteen of the conulariids terminate adapically in a probabe schott and/or exhibit a possible internal schott, while five specimens preserve one or two apertural lappets. The investigated conulariids lived in clumps and were buried catastrophically following alignment by unidirectional currents or flows acting on bodies that may have been leaning in the down-current direction and/or which had their center of mass displaced toward their apical end. Neither these nor 3000 additional specimens of A. anomala from the Sandbian Letna and Zahorany formations show any evidence of clonal budding, however, the hypothesis that clumping resulted from asexual proliferation cannot be ruled out. Finally, the periderm of A. anomala was compaction-resistant and smooth, lacking both corrugation (transverse ribs) and nodes, but whether the angular groove present at the facial midline of casts is a mould of a midline sulcus or of an internal carina remains unclear.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10506 - Paleontology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Lethaia

ISSN

0024-1164

e-ISSN

1502-3931

Svazek periodika

55

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

NO - Norské království

Počet stran výsledku

18

Strana od-do

1-18

Kód UT WoS článku

000865727500007

EID výsledku v databázi Scopus

2-s2.0-85137538141