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
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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
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OECD FORD obor
10506 - Paleontology
Návaznosti výsledku
Projekt
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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
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EID výsledku v databázi Scopus
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