Gyrinus sulcatus Wiedemann, 1821

Fery, Hans & Hájek, Jiří, 2021, Nomenclatural and taxonomic notes on some species of Gyrinidae (Coleoptera), Acta Entomologica Musei Nationalis Pragae 61 (1), pp. 55-71 : 60

Gyrinus sulcatus Wiedemann [ Enhydrus ] and Gyrinus sulcatus Forsberg [ Enhydrus ]

Homonymy. Gyrinus sulcatus Wiedemann, 1821 in Wංൾൽൾආൺඇඇ & Gൾඋආൺඋ (1821: 119) and Gyrinus sulcatus Forsberg, 1821: 314 are primary homonyms and subjective synonyms. The two taxa were described in the same year from Brazil and both names no doubt refer to the same species, the current Enhydrus sulcatus , because only a single species of Enhydrus is known which has ‘sulci’ on the elytra. It shall be noted that Gyrinus sulcatus Wiedemann is the type species of the genus Enhydrus .

The preface of volume 4 of the ‘ Magazin der Entomologie ’ ends with the date ‘ 1. Jun. 1821 ’ (which is not the publishing date). This volume is first given as published in the ʻ Allgemeiner Anzeiger der Deutschen ʼ (1821, no. 234, p. 2517; available e.g. in Google Books; information communicated by Y. Bousquet) which was issued on August 29, 1821. Thus, the latter date must be accepted as the publishing date of Wiedemann’s name.

The exact publishing date of volume 8 of the ‘ Nova Acta Regiae Societatis Scientiarium Upsaliensis ’ is unknown, and thus Forsberg’s taxon must be dated December 31, 1821. This is why Forsberg’s name must be treated as a junior primary homonym of Wiedemann’s name, and as such is permanently invalid.