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Trilobita - Proetida - Aulacopleuridae
It was assigned to Aulacopleurinae by Thomas and Owens (1978), Owen and Bruton (1980), Owen (1981) and Owen and Harper (1982); to Proetida by Sepkoski (2002); and to Aulacopleuridae by Jell and Adrain (2003) and Owens and Fortey (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.