English: The Middle Devonian blastoid Hyperoblastus; Milwaukee Formation; Lindwurm Member; Milwaukee County, Wisconsin; WESM-KCG 890; photograph originally published in K.C. Gass, J. Kluessendorf, D.G. Mikulic, and C.E. Brett, 2019. Fossils of the Milwaukee Formation: A Diverse Middle Devonian Biota from Wisconsin, USA. Siri Scientific Press, Manchester, UK.
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