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My 1st Dinosaur classification
Dear All,
I'm probably rushing this, but have non-dinosaur things needing more
attention. I'm no longer going to even try keeping saurischiforms and
ornithischiforms as sister groups (where the later split off is obviously
not going to be settled in the near future).
I had already been including Pseudolagosuchus as saurischiforms, and
there is no longer any good reason to exclude Lagerpetonidae and
Lagosuchidae as "non-dinosaur dinosauromorphs". My Order Saurischiformes
will be coded as paraphyletic with respect to Ornithischiformes, and if a
phytodinosauria clade does exist, I can easily code for that. But for now I
will be conservative and keep coding it as if the cladistic saurischians are
sister group to Order Ornithischiformes.
In the coelurosaur clade, note that I have removed Family Coeluridae
(sensu stricto) from the paraphyletic Family Ornitholestidae (as I had done
previously), just in case Holtz' most recent cladograms are correct. Also
moved Troodontidae up to see if I like a bullatosauria clade or not (I'm as
unsure about troodonts as anyone else; those T.'s really are a pain in the
cladogram).
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ORDER SAURISCHIFORMES
1 Lagerpetonidae
2 Lagosuchidae
3 Plesion _Pseudolagosuchus_
4 {{Ornithischiformes}}***(note below)
5 Massospondylidae
6A Plateosauridae
B Barapasauridae
C Euhelopodidae
D Diplodocidae
E Camarasauridae
F Brachiosauridae
G Titanosauridae
7 Plesion _Eoraptor_
8 Herrerasauridae
9 Guaibasauridae
10 Coelophysidae
B Ceratosauridae
_a_ Abelisauridae
11 Spinosauridae
12 Torvosauridae
13 Allosauridae
14 Ornitholestidae
? Tyrannosauridae
? Coeluridae (sensu stricto)
_1_ Ornithomimidae
? Troodontidae
2 Therizinosauridae
3 Caudipteridae
_a_ Oviraptoridae
4 Alvarezsauridae
5 Dromaeosauridae
6 Plesion _Rahonavis_
7 {{AVES}}
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***NOTE: This placement of the {{Ornithischiformes}} is fairly
conservative, and makes it a sister group of the cladistic "saurischians".
Will assume loss of the 5th toe occurred twice (at least for now).
If I understand George's ideas (correct me if I'm wrong), he would move
sauropods (my clade 6B-G) up as the second clade (right after
Lagerpetonidae), and move my two "lagosuchia" clades down (splitting off
just before Eoraptor).
I may well recognize more than just two broad families of prosauropods
in the future, but at least this reflects my belief that they are
paraphyletic rather than holophyletic. I will be presenting a coded family
classification of Ornithischiformes in the future. Comments welcome.
------Ken Kinman
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