Editing Calayan rail (section)

== Taxonomy ==
It was initially discovered by Carmela Espanola during fieldworlk in the area. The formal description as a species [[Bird species new to science|new to science]] appeared in the journal ''[[Forktail (journal)|Forktail]]'' (Allen ''et al.'' 2004).

Prior to 2022, it was classified in the genus ''Gallirallus''. Following studies in 2012 and 2013, all recent species in the genus ''Gallirallus'' aside from the Calayan rail and the [[weka]] of [[New Zealand]] were moved to the genus ''[[Hypotaenidia]]''. Following this, the Calayan rail and the weka were considered the two extant species of the genus ''Gallirallus''. However, a 2021 phylogenetic study found the Calayan rail to be [[Basal (phylogenetics)|basal]] to the species classified in ''[[Invisible rail|Habroptila]]'', ''[[Chestnut rail|Eulabeornis]]'', ''Gallirallus'', and ''Hypotaenidia'', and thus classified it into its own genus, ''Aptenorallus''.<ref>{{Cite journal |last1=Kirchman |first1=Jeremy J. |last2=McInerney |first2=Nancy Rotzel |last3=Giarla |first3=Thomas C. |last4=Olson |first4=Storrs L. |last5=Slikas |first5=Elizabeth |last6=Fleischer |first6=Robert C. |date=16 July 2021 |title=Phylogeny based on ultra-conserved elements clarifies the evolution of rails and allies (Ralloidea) and is the basis for a revised classification |url=https://bioone.org/journals/ornithology/volume-138/issue-4/ukab042/Phylogeny-based-on-ultra-conserved-elements-clarifies-the-evolution-of/10.1093/ornithology/ukab042.full |journal=[[Ornithology (journal)|Ornithology]] |volume=138 |issue=4 |pages=1–21 |doi=10.1093/ornithology/ukab042 |issn=0004-8038|url-access=subscription }}</ref> This was accepted by the [[International Ornithologists' Union|International Ornithological Congress]] in 2022.<ref>{{Cite web |title=Finfoots, flufftails, rails, trumpeters, cranes, Limpkin – IOC World Bird List |url=https://www.worldbirdnames.org/new/bow/flufftails/ |access-date=2022-08-24 |language=en-US}}</ref>