Trigonocheilus Dejean, 1833

Gustafson, Grey T. & Miller, Kelly B., 2013, On the family- and genus-series nomina in Gyrinidae Latreille, 1810 (Coleoptera, Adephaga), Zootaxa 3731 (1), pp. 77-105 : 98

Trigonocheilus Dejean, 1833

The nomen Trigonocheilus was first published by Dejean (1833) associated with the specific nomen T. rostratus De Haan , but there is no such publication by De Haan and this species nomen is a nomen nudum. Therefore, the original publication of Trigonocheilus does not contain an appropriate indication to a previously described species and does not meet the requirements of Article 12.2.5, and Trigonocheilus Dejean, 1833 is a nomen nudum.

Agassiz (1846) emended the spelling of Trigonocheilus to Trigonochilus . This emendation is unjustified according to Article 33.2.3 of the Code, but as Trigonocheilus Dejean is a nomen nudum and an unavailable nomen, so is its emendation. Nevertheless, this emendation is a distinct nomen with its own author and date, as are all unjustified emendations. There is a homonym of the unavailable nomen Trigonochilus Agassiz, 1846 , the ruteline scarab genus Trigonochilus Brenske, 1896 . As Trigonochilus Agassiz, 1846 is unavailable this should prevent any need for action to remove the homonomy between these two nomina.