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Trilobita - Proetida - Proetidae
It was reranked as Griffithidella (Thigriffides) by Hahn and Hahn (1970); it was misspelled as Thigiffides by Brezinski (1998), Sepkoski (2002) and Jell and Adrain (2003).
It was assigned to Griffithidella by Hahn and Hahn (1970); to Proetida by Sepkoski (2002); and to Proetidae by Salter (1864), Brezinski (1998) and Jell and Adrain (2003).
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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.