Dinosauromorpha

From Palaeos.org

o Sauria
|--Lepidosauromorpha
`--o Archosauromorpha
   |?--Choristodera
   `--+--Rhynchosauria
      `--+--Trilophosauridae
         `--+--Prolacertiformes
            `--o--Proterosuchidae 
               `--+--Erythrosuchidae
                  `--+--Euparkeriidae
                     `--o--Proterochampsidae
                        `--o Archosauria
                           |--o Ornithodira
                           |  |--Pterosauria
                           |  `--Dinosauromorpha
                           `--Crurotarsi

Information

Dinosauromorpha: Avipes? Birds > pterosaurs.

Range: from the Middle Triassic.

Characters

• Primitively, elongated rostrum and numerous small, serrated teeth on jaws.
• Cervical column with a strong sigmoid curve.
• Dermal scutes on dorsal midline.
• Long legs with forelimb being 50% or less of hind limb length.
• Hind-limb carried close to axis of body.
• Inturned femoral head.
• Advanced mesotarsal hinge with joint between astragalus-calcaneum unit and rest of foot.
• $ Astragalus with acute anteromedial corner.
• $ Articular surface of calcaneum for distal tarsals less than 35% of corresponding astragalar articular surface.
• $ Articular facet on distal tarsal 4 for metatarsal V reduced.
• "Hooked" metatarsal V absent.
• $ Metatarsals I & V narrower than II-IV.
• Probably habitually bipedal.

o Ornithodira
|--Pterosauria
`--o DINOSAUROMORPHA
   |--Lagerpeton
   `--o Dinosauriformes
      |--Lagosuchus (Lagosuchidae)
      `--+?-Pseudolagosuchus (Lewisuchidae)
         `--+?-Teyuwasu
            |?-Silesaurus
            `--+?-Herrerasauria (or Saurischia/Theropoda)
               `--+?-Agnostiphitys
                  `--o Dinosauria
                     |--Ornithischia
                     `--Saurischia

Links

• dinosauromorpha
• Reptilia.html
• dinochar.htm
• Marasuchus(formerly Lagosuchus)
• MEA 592D Dinosaur Osteology- Lecture 2. These lecture notes have good, concise treatments of the ancestry and characters of the Dinosauromorpha; but no graphics.
• Selected characters for dinosaur groups discussed in this course ...
• Dinosaur monophyly Fernando E. Novas, Journal of Vertebrate ...
• Dinosaurier-Interesse - Glossar
• GEOL 104 Lecture 14- The Origin of Dinosauria
• アグノスフィティス・クロムハレンシス
• Paleontologia de Argentina - Periodo Triasico.(Best on the Web.)
• Dinosauromorpha is a new site with considerable promise, but not much was posted when we visited (050828)
• Dinosaur Origins. The lecture notes have good, concise treatments of the ancestry and characters of the Dinosauromorpha; but no graphics.
• Microsoft PowerPoint - dinolec06.ppt. By contrast, this has all the slides, but no text to speak of.
• Lec 6 Origin of Dinosauria. This lecture has a bit of both, but focuses on the Dinosauria, rather than their ancestors.
• Wat is een dino I (moeilijk) is a Dutch translation of an article I wrote a number of years ago focusing on mechanics. I think the English version has (fortunately) been lost. Most of the article was derived from the work of John Hutchison. This, and much more besides, can now be found directly at:
  • "Adductors, abductors, and the evolution of archosaur locomotion"
  • "The evolution of femoral osteology and soft tissues on the line to ..."
  • "The evolution of pelvic osteology and soft tissues on the line to ..."
  • PII- S1095-6433(02)00158-7

References

Arcucci (1997); Fastovsky & Weishampel (1996); Novas (1996); White (2001).

Credits

Palaeos com ATW050828. This page MAK061024