In systematics one must distinguish between crown clades and total clades. While total clades include all extant and all extinct members of a given clade, crown clades comprises just the last common ancestor of the extant representatives of that clade and all its descendants. In other words, crown clades do not encompass representatives of the stem group.
The demand for a clear distinction between crown clades and total clades poses the question how to separate them taxonomically. Creating entirely new names for total clades according to the Principle of Priority, as both ICZN and ICPN suggest or tolerate (Louchard et al., 2013; de Queiroz, 2007; Cantino & de Queiroz, 2020; de Queiroz et al., 2020), might lead to a plethora of new and entirely different names for intimately related clades.
Therefore, I strongly favour the proposal of Lauterbach (1989, in German) to simply add the hyphenated prefix "pan-" to the crown-clade name to create an informal taxonomic name for the total clade, like pan-Aves. In my view, this rule should be applied rigorously, without exceptions.
In their paper on Strisores, Chen & Field (2020) suggest the total-clade names Pan-Trochilidae and Pan-Apodiformes for the respective crown clades, but for the total clade of the crown clade Strisores they propose the name Caprimulgimorphae, instead of Pan-Strisores. Although conforming to the PhyloCode, this approach should not be accepted by the ornithological community.
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