ICZN (1957). Direction 67. Addition to the Official List of Specific Names in Zoology (a) of the specific names of twenty species belonging to the Classes Trilobita, Crustaceae (other than species of the order Decapoda), Diplopoda and Arachnida, each of which is the type species of a genus, the name of which was placed on the Official List of Generic Names in Zoology up to the end of 1936, and (b) of the specific name of species belonging to the Class Arachnida which is currently treated as a senior synonym of the name of such a species. Opinions and declarations rendered by the International Commission on Zoological Nomenclature 1E(7): 111-128.

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