sentences:  In zoology establishing a new replacement name is a nomenclatural act and it must be expressly proposed to substitute a previously established and available name.Often, the older name cannot be used because another animal was described earlier with exactly the same name.For example, Lindholm discovered in 1913 that a generic name "Jelskia" established by Bourguignat in 1877 for a European freshwater snail could not be used because another author Taczanowski had proposed the same name in 1871 for a spider.