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Taxonomy
Ridderia was named by Spasskiy (1960) [Sepkoski's age data: D Eife]. It is not extant.
It was assigned to Metriophyllina by Hill (1981); and to Rugosa by Sepkoski (2002).
It was assigned to Metriophyllina by Hill (1981); and to Rugosa by Sepkoski (2002).