Abstract
In the Ordovician of Baltica, burrows assigned to the ichnogenus Arachnostega Bertling, 1992 occur in steinkerns of bivalves, cephalopods, gastropods and hyolithids. Arachnostega abundance decreased significantly during the Ordovician in Baltica. It was most abundant in the Darriwilian (17% of gastropod steinkerns), slightly less abundant in the Sandbian (11% of gastropod steinkerns) and least abundant in the Katian (3% of gastropod steinkerns). This change in Arachnostega abundance correlates well with the regional climatic change (from temperate to tropics) during this interval, along with resulting changes in sedimentary environment, geochemistry and biota. Arachnostega was substrate selective and preferred bivalves over gastropods. Arachnostega occurs only in the Middle and Upper Ordovician of Estonia and is absent in the Lower Ordovician. Olev Vinn. Department of Geology, University of Tartu, Ravila 14A, 50411 Tartu, Estonia; olev.vinn@ut.ee Mark A. Wilson. Department of Geology, The College of Wooster, Ohio, 44691 USA; mwilson@wooster.edu Michal Zaton. Department of Palaeontology & Stratigraphy, University of Silesia, Bedzinska 60, 41-200 Sosnowiec, Poland; mzaton@wnoz.us.edu.pl Ursula Toom. Institute of Geology, Tallinn University of Technology, Ehitajate tee 5, Tallinn; ursula.toom@ttu.ee
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