Editing Extinction (section)

===Pseudoextinction===
{{Main|Pseudoextinction}}

Extinction of a parent species where daughter species or subspecies are still extant is called pseudoextinction or phyletic extinction. Effectively, the old taxon vanishes, transformed ([[anagenesis]]) into a successor,<ref>{{cite book |last1=King |first1=Michael |last2=Mulligan |first2=Pamela |last3=Stansfield |first3=William |title=A Dictionary of Genetics |chapter=Pseudoextinction |date=2014 |publisher=Oxford University Press |edition=8th |isbn=978-0-19-976644-4 |url=https://www.oxfordreference.com/display/10.1093/acref/9780199766444.001.0001/acref-9780199766444-e-5536?rskey=f8g543&result=5527 |access-date=12 November 2023 |archive-date=21 March 2024 |archive-url=https://web.archive.org/web/20240321194758/https://www.oxfordreference.com/display/10.1093/acref/9780199766444.001.0001/acref-9780199766444-e-5536?rskey=f8g543&result=5527 |url-status=live}}</ref> or split into more than one ([[cladogenesis]]).<ref>{{Cite journal |last=Leighton |first=Lindsey R. |title=Taxon Characteristics That Promote Survivorship Through the Permian-Triassic Interval: Transition from the Paleozoic to the Mesozoic Brachiopod Fauna |journal=Paleobiology |date=2009 |volume=34 |pages=65–79 |doi=10.1666/06082.1 |s2cid=86843206}}</ref>

Pseudoextinction is difficult to demonstrate unless one has a strong chain of evidence linking a living species to members of a pre-existing species. For example, it is sometimes claimed that the extinct ''[[Hyracotherium]]'', which was an early horse that shares a common ancestor with the modern [[horse]], is pseudoextinct, rather than extinct, because there are several extant species of ''[[Equus (genus)|Equus]]'', including [[zebra]] and [[donkey]]; however, as fossil species typically leave no genetic material behind, one cannot say whether ''Hyracotherium'' [[Evolution of the horse|evolved into more modern horse species]] or merely evolved from a common ancestor with modern horses. Pseudoextinction is much easier to demonstrate for larger taxonomic groups.