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Tergomya - Tryblidiida
It was corrected as Tryblidioidea by Horný (1963), Starobogatov (1970) and Wagner (2017).
It was assigned to Monoplacophora by Horný (1963); to Tryblidioidea by Knight and Yochelson (1960), Rozov (1970) and Runnegar and Jell (1976); and to Tryblidiida by Starobogatov (1970), Wahlman (1992) 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.