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 Dejean, 1833 Dejean 1833 [151,459,1196,1221] Insecta Gyrinidae Orectochilus GBIF Animalia Coleoptera 19 96 Arthropoda genus  Authorship of  Orectochilushas also been variously attributed to different authors such as Dejean (1833), Stephens (1833), Lacordaire (1835) and Eschcholtz’s unpublished work. Dejean (1833) introduced the generic nomen  Orectochilus,attributed it to Eschcholtz, and associated it with several species, one of which was   O. villosus,the typespecies by subsequent designation of Balfour-Browne (1945: 111). According to the Code’s Article 12.2.5, Dejean’s genus-series nomen is valid by indication, since it was published before 1931, in a work with consistent binominal nomenclature, and it was used in combination with previously available species-series nomina. Lacordaire’s (1835) description, however, was the first for the genus. Another problem presents itself with the typefixation of  Orectochilusand authorship of the typespecies. Balfour-Browne (1945), in his attempt to fix some of the nomenclatural issues and typedesignations within  GYRINIDAE, designated the typeof  Orectochilusas  Gyrinus villosusIlliger, 1798, by monotypy within the genus, the nomen of which he attributed to Stephens (1835). However, the author of  Gyrinus villosusis actually Müller (1776), the first to have provided the nomen accompanied with a short description. According to Article 67.7 of the Code, the typefixation by Balfour-Browne (1945), even with incorrect author attribution, is valid. We wish to clarify that the typeof  OrectochilusDejean, 1833is unambiguously  Gyrinus villosusMüller, 1776.  Gyrinus villosushas been attributed to several other authors including Illiger, Gyllenhal, and, often, Fabricius. However, their publications date after Müller’s (1776) description that rendered the nomen available. There also exists a subsequent incorrect spelling of  Orectochilus,  Orectocheilus. Several authors have used this spelling including Hope (1838), Agassiz (1846) and Desmarest (1851), but these all use an incorrect subsequent spelling.