Hadogenes hahni ( Peters 1862 ) Acosta & Fet, 2005

Acosta, Luis E. & Fet, Victor, 2005, Nomenclatural notes in Scorpiones (Arachnida), Zootaxa 934 (1), pp. 1-12 : 6

Hadogenes hahni ( Peters 1862) comb. n. ( Liochelidae )

Ischnurus hahni Peters 1862: 26 .

Ischnurus taeniurus Thorell 1877a: 254 .

Hadogenes taeniurus: Fet 2000a: 389 [= Ischnurus hahni ]

Fet (2000a: 389) formally stressed that Hadogenes taeniurus (Thorell 1877) [1877a] and the long forgotten species Ischnurus hahni Peters 1862 are synonyms. But because the latter has not been cited since its original description, and H. taeniurus was the only name used for the species since 1876, Fet (2000a) gave precedence to Thorell's binomen. This action, made by an individual researcher, is not allowed by the Code, and only the strict use of the Principle of Priority is to be primarily used. The nearest provision is the Reversal of Precedence (introduced in the 4 th ed., Art. 29.3), in which individual authors can reverse priority when long unused names are involved, but only if several quite strict conditions are met. While the first condition is fulfilled (Art. 23.9.1.1, the senior synonym not being used as valid after 1899), the second is clearly not: in the immediately preceding 50 years there are only nine citations for H. taeniurus ( Fet 2000a) , far from the 25 works required by Art. 23.9.1.2. Thus, the valid name is Hadogenes hahni ( Peters 1862) comb. n.