had been attributed to persons who never published a scientific work. This new rule was however not sufficiently accurate and did not provide an exact guide, so in the following decades taxonomic practice continued to diverge among disciplines and authors. The ambiguous situation led a member of the ICZN Commission in 1974 to provide an interpretation of Art. 50 of the second edition of the Code (effective since 1961), where the author had been defined as "the person who first publishes a scientific name in a way that satisfies the criteria of availability", an interpretation following which this should be seen as largely being restricted to providing a description or diagnosis. Currently most (but not all) taxonomists accept this view and restrict authorship for a taxonomic name to the person who wrote the textual scientific content of the original description. The author of an image is not recognized as co-author of a name, even if the image was the only base provided for making the name available. The author is usually the author of the work, but sometimes new zoological names were not established by that author. If a true author of a written text is not directly recognizable in the original publication, she or he is not the author of a name (but the author of the work is). The text could actually be written by a different person. Some authors have copied text passages from unpublished sources without acknowledging them. In Art. 50.1.1 all these persons are excluded from the authorship of a name, if they were not explicitly mentioned in the work itself for being the responsible persons for making a name available. Most taxonomists also accept Art. 50.1.1 that the author of a cited previously published source, from which text passages were copied, is not acknowledged as the author of a name. Not all taxonomists seem to know this, and there are traditions in some animal groups (for example in fish nomenclature) where the "true" author of a work is still occasionally cited in the name of a species ("Walbaum (ex Klein), 1792"). In some cases the author of the description can differ from the author of the work. This must be explicitly indicated in the original publication, either by a general statement ("all zoological descriptions in this work were written by Smith"), or by an individual statement ("the following three descriptions were provided by Jiménez",