Editing Incertae sedis (section)

== Phylogenetic vs. nomenclatural uncertainty ==
The term ''incertae sedis'' refers to uncertainty about phylogenetic position of a taxon, which may be expressed, among others, by using a question mark after or before a taxon name. This should be distinguished from the situation where either it is uncertain how to use a name, often because the types have been lost (''[[nomen dubium]]'', ''[[species inquirenda]]''), or whether a poorly preserved specimen should be included within a given species or genus, which is often expressed using a 'cf.' (from Latin ''confer'', compare, before a taxon name); such a convention is especially widespread in palaeontology.<ref>{{Cite journal |last1=Bengtson |first1=Peter |date=January 1988 |title=Open Nomenclature |journal=[[Palaeontology (journal)|Palaeontology]] |volume=1 |issue=31 |pages=223–227 |url=https://www.palass.org/sites/default/files/media/publications/palaeontology/volume_31/vol31_part1_pp223-227.pdf}}</ref>