Requested reference

Koch, C. L. (1839b). Übersicht des Arachnidensystems. Heft 2. C. H. Zeh'sche Buchhandlung, Nürnberg, 38 pp. [for the detailled publishing date see Nagel & Grieder, 2019: 47] doi:10.5962/bhl.title.39561 download pdf -- Show included taxa

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