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A Carboniferous chiton (Mollusca, Polyplacophora) at the end of its trail: a unique find from the Czech Republic
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SYSNO ASEP 0478555 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název A Carboniferous chiton (Mollusca, Polyplacophora) at the end of its trail: a unique find from the Czech Republic Tvůrce(i) Mikuláš, Radek (GLU-S) RID, SAI
Rindsberg, A. K. (US)
Santos, A. (ES)
Pavela, M. (CZ)Zdroj.dok. Bolletino della Societa Paleontologica Italiana. - : Societa Paleontologica Italiana - ISSN 0375-7633
Roč. 56, č. 2 (2017), s. 171-179Poč.str. 9 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. IT - Itálie Klíč. slova Viséan ; Recent ; locomotion traces ; tracemakers ; Proleptochiton Vědní obor RIV DB - Geologie a mineralogie Obor OECD Paleontology Institucionální podpora GLU-S - RVO:67985831 UT WOS 000412075800010 EID SCOPUS 85028596700 DOI 10.4435/BSPI.2017.15 Anotace An exceptional find of a chiton preserved at the end of its locomotion trace comes from the Culm facies, that is, from a succession of turbidity-controlled dark shales, greywackes and sandstones. The chiton trace is a smooth, rather indistinct, 7-8 mm wide bilobate ridge (convex epirelief), forming an incompletely preserved loop of estimated extent 50 x 80 mm. At its end is preserved a completely articulated chiton Proleptochiton sp., 4.0 mm wide and 11.5 mm long, oriented congruently with the trace. The neighbouring strata provide relatively common ichnofossils, including Chondrites isp., Planolites isp., Dictyodora liebeana (Geinitz) and Diplocraterion isp. The chiton’s trace fossil corresponds to ichnotaxa that have historically been compared to modern gastropod trails. The gastropods are well-known for two different monotaxic locomotion techniques, one for hard substrates such as glass, and another for soft substrates, where the animals move through muscular waves of much higher amplitude than observed on glass. Thereby, adhesion useable for movement on the hard surface is functionally replaced with friction. Loosening of the sediment by rapid movements of foot muscles is the cause of the structure’s convexity, that is, increasing volume. Similar behaviour is documented for the first time in chitons. The studied specimen is the first locomotion trace fossil attributed to polyplacophorans. The find documents the burrowing technique of chitons in deep-marine, turbidity-influenced soft substrate during the Viséan (330 Ma). It demonstrates the similarity of chiton and some gastropod traces in soft substrates, and adds to the lengthening list of animals that were fossilized within their traces. Pracoviště Geologický ústav Kontakt Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Rok sběru 2018
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