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Cephalopoda - Goniatitida - Girtyoceratidae
It was reranked as Eumorphoceras (Sulcogirtyoceras) by Ruzhentsev and Bogoslovskaya (1971).
It was assigned to Eumorphoceras by Ruzhentsev and Bogoslovskaya (1971); to Goniatitida by Sepkoski (2002); to Girtyoceratidae by Korn (2006); and to Girtyoceratinae by Furnish et al. (2009).
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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.