Re: Newcomer (Male) with a few things to share (2nd attempt)

[Michael Mortimer <mickey_mortimer111@msn.com>]

Jamie Stearns wrote-

> Yes, it probably should be. I intended it to show, for example, everything 
> between Allosaurus and Mapusaurus as being progressively more derived. Ths 
> is really how it should have been:
> Non-Coelurosaurian Theropods:
> |---Ornithischia
> `---Sauropodomorpha
> ..`---Guaibasaurus
> ....`---Eoraptor
> ......`--+---Herrerasaurus
> ........|...`---Staurikosaurus
> ........`---Segisaurus
> ..........`---Procompsognathus
> ............`---Coelophysis
> ..............`---Syntarsus
> ................`---Gojirasaurus
> ..................`---Liliensternus
> ....................`---Dilophosaurus
> ......................`--+---Elaphrosaurus
> ........................|...`---Spinostropheus
> ........................|.....`---Ceratosaurus
> ........................|.......`---Rugops
> ........................|.........`--+---Masiakasaurus
> ........................|...........|...`---Noasaurus
> ........................|...........|--+---Abelisaurus
> ........................|...........|....`---Indosuchus
> ........................|...........|---Ekrixinatosaurus
> ........................|...........|--+---Aucasaurus
> ........................|...........|....`---Carnotaurus
> ........................| ..........`---Majungasaurus
> ........................|.............`---Rajasaurus
> ........................`--+--+---Megalosaurus
> .........................|...|.....`---Poekilopleuron
> .........................|...`---Torvosaurus
> .........................|....`--+---Baryonyx
> .........................|......|...`---Suchomimus
> .........................|.....`---Irritator
> .........................|......`---Spinosaurus
> .........................`---Eustreptospondylus
> ...........................`---Gasosaurus
> .............................`--+---Cryolophosaurus
> ...............................| ...`---Piatnitzkysaurus
> ...............................|......`---Afrovenator
> ...............................|........`---Monolophosaurus
> ...............................|..........`---Fukuiraptor
> ...............................|............`--+---Siamotyrannus
> ...............................|..............|...`---Metriacanthosaurus
> ...............................|..............|.....`---Sinraptor
> ...............................|..............|.......`---Yangchuanosaurus
> ...............................|..............`---Allosaurus
> ...............................|................`---Neovenator
> ...............................|..................`---Acrocanthosaurus
> ...............................|....................`---Tyrannotitan
> ...............................|......................`---Carcharodontosaurus
> ...............................|........................`---Giganotosaurus
> ...............................|..........................`---Mapusaurus
> ...............................`--Coelurosauria

Ah good.  Among the odder parts, I would ask why is-
Guaibasaurus basal to Eoraptor and herrerasaurids?
Segisaurus more basal than other coelophysoids?
"Syntarsus" closer to birds than Coelophysis?
Rugops outside the Noasauridae+Abelisauridae clade?

> > Tykoski (2005) found Liliensternus and Zupaysaurus to share the following 
> > characters with other coelophysids- alveolar ridge on maxilla; deep 
> > ventral fossa on ectopterygoid; low post-axial cervical neural spines; 
> > ischiopubic ratio <66%; proximal end of metatarsal III with ventral boss; 
> > anterior ramus of maxilla <10% maxillary length; more than 19 maxillary 
> > teeth; anterior margin of antorbital fossa squared; anterior lacrimal 
> > process longer than ventral process; cervical ribs fused to vertebrae in 
> > adults.
> Some of those could be primitive characters that were later lost. Are any 
> of these known for Eoraptor or the herrerasaurids?

That's the right question to ask.
Eoraptor has the alveolar ridge, Herrerasaurus doesn't.
Both have short anterior maxillary rami.
Both lack the large maxillary tooth number.
Eoraptor has the squared aofo, Herrerasaurus doesn't.
Both lack the elongate anterior lacrimal process.
The ectopterygoid condition is unknown in both.
Eoraptor has low cervical neural spines, Herrerasaurus doesn't.
Herrerasaurus lacks fused cervical ribs, Eoraptor's condition is unknown.
Both lack shortened ischia.
Both lack the metatarsal boss.

What characters join Liliensternus with Dilophosaurus and other theropods?

Mickey Mortimer