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References
- ↑ Chasmatopora at www.bryozoa.net.
- ↑ Andrej Ernst & Marcelo Carrera (2012). "Upper Ordovician (Sandbian) bryozoan fauna from Argentine Precordillera". Journal of Paleontology . 86 (5): 721–752. doi:10.1666/12-024.1. hdl: 11336/52220 . S2CID 86306266.
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