|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Trilobita - Corynexochida - Illaenidae
It was assigned to Corynexochida by Sepkoski (2002); and to Illaenidae by Raymond (1916), Warburg (1925), Neuman (1964), Owen and Bruton (1980), Bruton and Owen (1988), Zhou et al. (1998), Fortey and Droser (1999), Jell and Adrain (2003) and Fortey and Bruton (2013).
|Year||Name and author|
|1916||Illaenus Raymond p. 4|
|1980||Illaenus Owen and Bruton|
|1988||Illaenus Bruton and Owen|
|1998||Illaenus Zhou et al. p. 714|
|1999||Illaenus Fortey and Droser p. 192|
|2002||Illaenus Sepkoski, Jr.|
|2003||Illaenus Jell and Adrain p. 387|
|2013||Illaenus Fortey and Bruton|
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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.