"Arachniotus ruber" was first described by Philippe Édouard Léon Van Tieghem in 1877 and it was thought to belong to the genus, "Gymnoascus", due to similarities he observed in the gametangial initials.It was not until 1893 that Schroeter transferred the species to his recently established genus, "Arachniotus", due to it possessing many of the corresponding traits.