Do Myxini, Ostracodermi and Placodermi really go under Gnathostoma? Aren't they all jawless?
From the Tree of Life Website:
This has just five clades under Gnathostomata: Acanthodii, Actinopterygii, Chrondricthyes, Placodermi, and Sarcopterygii. The last encompasses both lobe-finned fishes and all terrestial vertebrates.
This puts the hagfishes in their very own group.
This divides jawless vertebrates into several different groups, and lumps all jawed vertebrates under Gnathostomata. TOL does not use the term "Agnatha" for any group.
-- Rutledge, 4 November 2006
- I don't know much about this stuff, but I wanted to insert a link here: User_talk:PA/Vertebrate_taxonomy. A discussion between Lycaon and PA. It's a plan for a change. Is it the same to yours? --Kempm 08:15, 5 November 2006 (UTC)
- I don't have a plan per se. I had just noticed that the Vertebrate section needs a major overhaul and that there are inconsistencies that need resolving. I simply thought that we could tend to this at the same time we were changing the format. Thanks for the link, BTW. It does address problems that I'd noticed. --Rutledge, 08:22 5 November 2006 (EST)
Here's what we've got so far:
There are at least two superclasses under Gnathostomata: Osteoichthyes(sp?) and Tetrapoda. The latter is straightforward enough; it gets all the land vertebrates: Mammalia, Amphibia, etc. Osteoichthyes gets Actinopterygii and Sarcopterygii, the two major classes of bony fish. Dipnoi seems to be a subclass of Sarcopterygii.
The sticking points are Chondricthyes and the extinct guys like Acanthodi and Placodermi. These are classes. Where do they go? The Wikipedia article describes Acanthodi as having traits that put them midway between Chondricthyes and Osteoicthyes.
--Rutledge. 4:34 14 November 2006 (EST)
Here's yet another classification system: http://www.thecanadianencyclopedia.com/index.cfm?PgNm=TCE&Params=A1SEC874624.
--Rutledge 9:35 15 November 2006 (EST)
Wikispecies does not have any descriptions of the forms of life that fall into these categories? This seems like an awful waste and makes this site much more difficult to navigate and use.