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There are some soft constraints that separate Chordata from other biological lineages, but have not yet been made part of the formal definition.
There still is a lot of differential (DNA sequence based) comparison research going on that is trying to separate out the simplest forms of chordata. As around 90% of the species on Earth don't have a backbone like chordata. Some of these species may have lost their chordata like structures over time and this complication continues to complicate the complete definition of Chordata. Eyreland ( talk) 03:04, 10 September 2016 (UTC)
What about blue skinned frogs, blue skinned monkeys like mandrills, blue skinned wattles on turkeys and cassowaries and blue fish? Are none of those pigmented? — Preceding
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The cladogram under phylogeny is so full of problems that it should be edited or removed: Condrychthyes is missing! Sarcopterygii appears to be a synonym of Tetrapods! — Preceding unsigned comment added by Gabe Lemag ( talk • contribs) 17:33, 5 March 2018 (UTC)
This sentence doesn't make sense:
You can't have a superclass within a subclass - should it be the other way round? 31.50.203.97 ( talk) 11:48, 15 September 2019 (UTC)
In the classification section, Cephalochordata is listed with Acraniata in brackets behind it. Haeckel's 1866 Acrania is considered synonymous with Cephalochordata according to its page (though it is also shown on a specific internal branch of the tree of that page, which is a problem all of its own), but I am not sure of the taxonomic history of Acraniata. The Acraniata page is a redirect to Invertebrate, whereas Acrania page is for the developmental defect by the same name (not linked here to spare the reader some pretty graphic imagery). There seems to be some chaos here that needs to be straightened out. Can we remove the piece in brackets, as Cephalochordata is simply the most accepted name right now? Or does it have some greater historical significance of which I am unaware? Dr Mark D. Scherz 08:31, 9 April 2021 (UTC)