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Diminutive epibionts on crinoid stems from the Lower/Middle Devonian boundary in the Barrandian, Czech Republic

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23420%2F22%3A43966762" target="_blank" >RIV/49777513:23420/22:43966762 - isvavai.cz</a>

  • Výsledek na webu

    <a href="http://hdl.handle.net/11025/51539" target="_blank" >http://hdl.handle.net/11025/51539</a>

  • DOI - Digital Object Identifier

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Diminutive epibionts on crinoid stems from the Lower/Middle Devonian boundary in the Barrandian, Czech Republic

  • Popis výsledku v původním jazyce

    Diminutive crinoid holdfasts and cemented tests of the foraminifers Psammosphaera and Toly pammina were observed on coarse bioclasts in weathered limestones of the Daleje-Třebotov Formation. Specimens were obtained in 1984 by washing so called “white beds” at a temporary locality in Praha Barrandov. A few millimeter sized bioclasts with epibionts were freed from hard limestone beds of the Třebotov Limestone near the Lower/Middle Devonian boundary by long-term weathering. Many of the crinoid holdfasts attached to pluricolumnals provoked a stereomic response of the host crinoid. Also the growth orientation of the crinoid epibiont is not random and indicates some crinoid-epibiont to crinoid host interaction. Reaction of host stereome and non-random stem orientation offer direct evidence of epi biont larval settlement and subsequent growth on the stem of a living crinoid host. The extensive growth of the host stereome ended by partial to total engulfing of the epibiont holdfast. This indicates advancing and finally successful defence of the host crinoid against the epibiont. The holdfast gives evidence that the small host crinoids offered a somewhat higher tier for even smaller epibiont crinoids. However, other observed holdfasts indicate fixation of larva and growth over loose bioclasts lying on a sea bed. Location of foraminifer test on bioclasts confims that foraminifers cemented and grew on loose echinodermal and brachiopod remains and preferred crevices and similar protected sites with concave profiles. This is clear evidence that diverse bioclasts (brachiopod shells, pelmatozoan ossicles) provided the hard substrate suitable for epibiont life on a sea bed.

  • Název v anglickém jazyce

    Diminutive epibionts on crinoid stems from the Lower/Middle Devonian boundary in the Barrandian, Czech Republic

  • Popis výsledku anglicky

    Diminutive crinoid holdfasts and cemented tests of the foraminifers Psammosphaera and Toly pammina were observed on coarse bioclasts in weathered limestones of the Daleje-Třebotov Formation. Specimens were obtained in 1984 by washing so called “white beds” at a temporary locality in Praha Barrandov. A few millimeter sized bioclasts with epibionts were freed from hard limestone beds of the Třebotov Limestone near the Lower/Middle Devonian boundary by long-term weathering. Many of the crinoid holdfasts attached to pluricolumnals provoked a stereomic response of the host crinoid. Also the growth orientation of the crinoid epibiont is not random and indicates some crinoid-epibiont to crinoid host interaction. Reaction of host stereome and non-random stem orientation offer direct evidence of epi biont larval settlement and subsequent growth on the stem of a living crinoid host. The extensive growth of the host stereome ended by partial to total engulfing of the epibiont holdfast. This indicates advancing and finally successful defence of the host crinoid against the epibiont. The holdfast gives evidence that the small host crinoids offered a somewhat higher tier for even smaller epibiont crinoids. However, other observed holdfasts indicate fixation of larva and growth over loose bioclasts lying on a sea bed. Location of foraminifer test on bioclasts confims that foraminifers cemented and grew on loose echinodermal and brachiopod remains and preferred crevices and similar protected sites with concave profiles. This is clear evidence that diverse bioclasts (brachiopod shells, pelmatozoan ossicles) provided the hard substrate suitable for epibiont life on a sea bed.

Klasifikace

  • Druh

    J<sub>ost</sub> - Ostatní články v recenzovaných periodicích

  • CEP obor

  • OECD FORD obor

    10506 - Paleontology

Návaznosti výsledku

  • Projekt

  • Návaznosti

    S - Specificky vyzkum na vysokych skolach

Ostatní

  • Rok uplatnění

    2022

  • Kód důvěrnosti údajů

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

Údaje specifické pro druh výsledku

  • Název periodika

    Folia Musei rerum naturalium Bohemiae occidentalis - Geologica et Paleobiologica

  • ISSN

    1805-2371

  • e-ISSN

    1805-286X

  • Svazek periodika

    56

  • Číslo periodika v rámci svazku

    1-2

  • Stát vydavatele periodika

    CZ - Česká republika

  • Počet stran výsledku

    16

  • Strana od-do

    27-42

  • Kód UT WoS článku

  • EID výsledku v databázi Scopus