I saw a turtle when identifying and called it a turtle. A short while later, someone identified it as a painted turtle. I looked it up to see whether it’s a sideneck or hideneck turtle. I looked at Testudines and saw that Pleurodira (sideneck) is a taxon here, but Cryptodira (hideneck) is not. How come?
Not sure, but you can ask on a flag or taxon change. https://www.inaturalist.org/taxon_changes/25004
Probably because most people aren’t using iNat for their higher level taxonomy. For what it’s worth, the Sub-Order Pleurodira was only added a year ago (https://www.inaturalist.org/taxa/1630865/history).