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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).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Ridderia Spasskiy 1960
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Diagnosis
No diagnoses are available