Updated 23 Jan. 2024
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Nematogenys Girard 1855 nḗmatos (Gr. νήματος), threaded; génys (Gr. γένυς), jaw (usually the cheek or lower jaw in ichthyology), referring to long maxillary barbels, absent in Trichomycterus (original genus of N. inermis)

Nematogenys inermis (Guichenot 1848) Latin for unarmed, referring to absence of opercular spines, which distinguished it from presumed congeners in Trichomycterus (Trichomycteridae) at time of description