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Taxonomy
Illaenus stenorhachis was named by Harrington (1938). Its type specimen is CPBA 4165 and is a 3D body fossil.
It was recombined as Illaenopsis stenorhachis by Harrington and Leanza (1957); it was recombined as Asaphellus stenorhachis by Meroi Arcerito et al. (2015), Tortello and Esteban (2016).
It was recombined as Illaenopsis stenorhachis by Harrington and Leanza (1957); it was recombined as Asaphellus stenorhachis by Meroi Arcerito et al. (2015), Tortello and Esteban (2016).
Sister species lacking formal opinion data