On the family- and genus-series nomina in Gyrinidae Latreille, 1810 (Coleoptera, Adephaga) Gustafson, Grey T. Miller, Kelly B. Zootaxa 2013 3731 1 77 105 Hope, 1838 Hope 1838 [151,428,980,1005] Insecta Gyrinidae Potamobius GBIF Animalia Coleoptera 21 98 Arthropoda genus  The generic nomen  PotamobiusHope, 1838raises a nomenclatural problem. Hope (1838) presented a table of the genera of  GYRINIDAEand listed  Potamobiuscredited to Leach, with the typespecies  P. modeeriiMarsham, 1802. In accordance with Article 12.2.5 of the Code, Hope’s table with clear indication to the valid species of “  modeeriiMarsham” is an indication. Marsham’s (1802) nomen was actually originally  Gyrinus modeeri, and Hope (1838) seems to have simply misspelled it. Hope’s (1838) table includes brackets around genera considered to be synonymous. He considered  Orectochilus(which he spelled  Orectocheilus) as a synonym of  Potamobius, and stated in his discussion of  Orectochilus villosusthat the species is “Now a  Potamobiusof Leach”. Hope’s (1838) statement gains additional meaning upon reading Stephens’ (1829a) section on  GYRINIDAE. Stephens (1829a) listed references in parentheses including the author followed by a citation. A source frequently cited is “(Sam. I. 20)” clearly referring to Samouelle (1819). Stephens (1829 a) presented two divisions for the species of  GYRINIDAE, “A. Elytris glabris” and “B. Elytris villosis.—( Potamobius, Leach MSS.)”, the latter including species “543. 7,  villosus” with “ Gy. ModeeriMarsham” apparently listed as a synonym. Samouelle (1819) presented a similar arrangement for the  GYRINIDAEwith the divisions “’* Elytra naked, with punctured striae.’ Leach.” and “** Elytra smooth, villose.’ Leach”. Samouelle (1819) acknowledged that Leach had given him all of his manuscripts for use in his work and he credited Leach for those ideas, including the nomen  Potamobius. Hope (1838) was apparently under the impression that Stephens (1829 a) placed the species   O. villosusas well as  G. modeeriinto the genus  Potamobiusbased on Leach’s unpublished manuscript, though that was not clearly Stephens’ (1829 a) intention. Additional evidence that Stephens (1829 a) was merely citing Leach’s manuscript comes from another of his papers published the same year (Stephens 1829 b) in which he included only a single genus in the  GYRINIDAE,  Gyrinus, including the species  G. villosus, suggesting that he did not recognize  Potamobiusas a valid nomen. The nomen  Potamobiuswas used again for a genus by Samouelle (1819), attributed again to Leach, but for a crustacean, having nothing to do with the  GYRINIDAE. This, however, makes  Potamobius, as conceived by Hope (1838) for the  GYRINIDAE, a junior homonym of  PotamobiusSamouelle, 1819. The typelisted for  Potamobiusby Hope is “  modeeri”, which by most authors is considered a junior synonym of   O. villosusMüller, making  PotamobiusHope, 1838both a junior homonym and a junior subjective synonym.