Template:Ewin et al., 2019
- Ewin, T.A.M., Reich, M., Graham, M.R. & Cournoyer, M.E. 2019. Perforocycloides nathalieae new genus and species, an unusual Silurian cyclocystoid (Echinodermata) from Anticosti Island, Québec, Canada. Paläontologische Zeitschrift 93(4): 625–635. DOI: 10.1007/s12542-019-00483-w
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