Opinion 517. Rejection of the proposal for the validation under the Plenary Powers of the emendation to Theridium of the generic name Theridion Walckenaer, 1805; use of the above Powers (i) to validate the specific name picta Walckenaer, 1802, as published in the combination Aranea picta, (ii) to designate the species so named to be the type species of Theridion Walckenaer, 1805, and (iii) to suppress the generic name Phyllonethis Thorell, 1869 (Class Arachnida) - ICZN (Opinions and declarations rendered by the International Commission on Zoological Nomenclature, 1958)