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Journal of Paleontology

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The Earliest Endosymbiotic Mineralized Tubeworms from the Silurian of Podolia, Ukraine

¹ Institute of Geology, University of Tartu, Vanemuise 46, 51014 Tartu, Estonia, <olev.vinn{at}ut.ee>
² Institute of Geology, Tallinn University of Technology, Ehitajate str. 5, 19086 Tallinn, Estonia, <motus{at}gi.ee>

The earliest endosymbiotic tubeworms have been discovered within skeletons of the tabulate coral Heliolites sp. from the Silurian (Ludlow) of Podolia, Ukraine. The new tubeworm species has a maximum diameter about 1 mm, a slightly conical tube, a smooth lumen in the tube and a lamellar wall structure. The tube wall is 0.05–0.10 mm thick. The new endosymbiotic tubeworm Coralloconchus bragensis n. gen. and sp. shares zoological affinities with the tentaculitids (incertae sedis) and is assigned to the Family Cornulitidae (Tentaculita, Cornulitida).