Ma, X.; Day, J. (2007). Morphology and revision of Late Devonian (Early Famennian) Cyrtospirifer (Brachiopoda) and related genera from south China and North America. Journal of Paleontology. 81(2): 286-311.
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Ma, X.; Day, J.
2007
Morphology and revision of Late Devonian (Early Famennian) Cyrtospirifer (Brachiopoda) and related genera from south China and North America