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Tergomya - Cyrtonellida - Cyrtolitidae
It was reranked as Cyrtonella by Knight and Yochelson (1960), Starobogatov (1970), Runnegar and Jell (1976), Sepkoski (2002) and Wagner (2017).
It was assigned to Cyrtolites by Hall (1879); to Cyrtolitidae by Runnegar and Jell (1976); to Cyrtonellida by Sepkoski (2002); and to Cyrtonellidae by Knight and Yochelson (1960), Starobogatov (1970) and Wagner (2017).
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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.