Species
Illaenus atavus Eichwald, 1858
Synonymy list
1858     Ill. atavus — Eichwald , pp. 334
1860     Actinolobus atavus Eichwald — Eichwald 
1886     Illaenus atavus Eichwald — Holm , pp. 135-139, fig. 7: 4-11
Selection of related publications
Holm, G. 1886. Revision der ostbaltischen Trilobiten. Abt. III. Illaeniden.  Revision der ostbaltischen Trilobiten. Abt. III. Illaeniden, pp. 1–173. 
Eichwald, E. 1858. Beitrag zur geographischen Verbreitung der fossilen Thiere Russlands. Alte Periode (Fortsetzung. S. Bulletin 1851. N 1. pag. 192). Klasse der Krustazeen. Klasse der Fische. Klasse der Reptilen.  Bulletin of the Moscow Society of Naturalists. Geological series   30,   IV,   305-354.
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Classification
References based on distribution
- Holm, 1886a Paldiski Aseri Stage
 - Holm, 1886a Aseri Stage
 - Eichwald, 1858 Paldiski