Nomina dubia in the genus Theridion resulting from errors in instalment six of Carl Wilhelm Hahn’s “Monographie der Spinnen” (Araneae: Theridiidae)
Nomina dubia in der Gattung Theridion durch Fehler in Heft 6 von Hahn’s „Monographie der Spinnen“ (Araneae: Theridiidae)
An overlooked error in the correlation of new scientific names with the spider images on plate 4 in Carl Wilhelm Hahn’s sixth instalment of his book ”Monographie der Spinnen” led to the notion that at least two of the spiders illustrated on plate 4 cannot be identified and their names are nomina dubia. Here, I draw attention to the fact that, if the names are re-aligned to the images in a meaningful way, then at least three spiders on plate 4 can be identified. Theridion rufipes sensu Hahn is a synonym of Gongylidium rufipes (Linnaeus, 1758) (syn. conf.). In particular, the previous nomen dubium Theridion tibiale Hahn, 1831 is a senior synonym of Lasaeola tristis (Hahn, 1833) (syn. nov.). Evidence is presented that the junior synonym is in prevailing usage and the senior synonym is therefore regarded as nomen oblitum.
doubtful species, new synonym, nomenclature, reversal of priority