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Schneider, S. (2017). Pachyrisma grande Morris & Lycett, 1850: redescription and assessment of its potential role as an ancestor to the Hippuritida. Zitteliana. 89: 271-284.
Schneider, S. (2017). Pachyrisma grande Morris & Lycett, 1850: redescription and assessment of its potential role as an ancestor to the Hippuritida. Zitteliana. 89: 271-284.