Data from: The anatomy, taphonomy, taxonomy and systematic affinity of Markuelia: Early Cambrian to Early Ordovician scalidophorans

Xi-Ping Dong, Stefan Bengston, Neil J. Gostling, John A. Cunningham, Thomas H. P. Harvey, Artem Kouchinsky, Anatoly K. Val'kov, John E. Repetski, Marco Stampanoni, Federica Marone & Philip C. J. Donoghue
Markuelia is a vermiform, annulated introvertan animal known as embryonic fossils from the Lower Cambrian to Lower Ordovician. Analysis of an expanded and revised dataset for Introverta shows that the precise position of Markuelia within this clade is dependent on the taxa included. As a result, Markuelia is assigned to the scalidophoran total group to reflect uncertainty as to whether it is a stem-scalidophoran or a stem-priapulid. The taxonomy of the genus is revised to...

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