ACT NOMENCLATURAL
a published act which affects the nomenclatural status of a scientific name or the typification of a nominal taxon; available nomenclatural act is one that is published in an available work; invalid nomenclatural act is any nomenclatural act which is not valid under the provisions of the International Code of Zoological Nomenclature; unavailable nomenclatural act is one published in an unavailable work; valid nomenclatural act is one that is accepted under the provisions of the Code, i.e. the earliest available act not contravening any provision of the Code