Talk:Avialae

message: Your wikipedia page on Archaeopteryx says this:
Archaeopteryx, sometimes referred to by its German name Urvogel ("original bird" or "first bird"), is the earliest and most primitive bird known.
Archaeopteryx was a primitive bird that lived during the Tithonian stage of the Jurassic Period, around 150–145 million years ago.
The other page states that Archaeopteryx is a bird. This page suggests that it is a theropod dinosaur.
What is Archaeopteryx? It cannot be both a reptile and a bird!
Also, this page shows Avialae as a small subsection of the class Reptilia, while the other page shows Archaeopteryx as a genus under the class Aves.
If birds are reptiles, then there is no need for a class Aves. If birds are avialans, then why mark them as separate from Avialae?  Jon (talk) 10:45, 23 July 2009 (UTC)
replies: text: As you can probably tell, ranks like Class and the separations between them are arbitrary. Beyond that, no valid osurce has attempted to modernize and standardize the classifications. So the distinction between bird and reptile, Avialae, etc. will be murky and self-contradictory for the foreseeable future, unfortunately. Also, birds are theropod dinosaurs, so that in itself isn't a contradiction. The fact that some theropod dinosaurs get placed in a different class from others is due to the two different classification systems in use. On, the Linnean system, draws lines between groups, so a bird can't also be a reptile. The other, the Cladistic system, doesn't draw lines. Instead, groups are nested, so Birds are dinosaurs are reptiles. Avialae exists only in the later system, Reptilia exists only in the former system, and Aves exists in both and is used in several different ways, as explained in this article. Dinoguy2 (talk) 16:43, 23 July 2009 (UTC)
thread_title:  Archaeopteryx - bird or reptile? 

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thread_title:  External links modified