| Palaeos | |
Sauropterygia |
| Vertebrates | Dendrogram |
| Page Back | Unit Home | Unit Dendrogram | Unit References | Taxon Index | Page Next |
| Unit Back | Vertebrates Home | Vertebrate Dendrograms | Vertebrate References | Glossary | Unit Next |
|
Abbreviated Dendrogram
DIAPSIDA |--ARCHOSAUROMORPHA |LEPIDOSAUROMORPHA |--SAUROPTERYGIA | |--Placodontia | |==Pachypleurosauridae | `--+--Nothosauridae | `--Plesiosauria | |--Pliosauroidea | `--Plesiosauroidea | |--Elasmosauridae | `--Cryptocleidoidea `--Lepidosauriformes |--SPHENODONTIA `--SQUAMATA |
Contents
Overview |
DIAPSIDA
|--ARCHOSAUROMORPHA
|
LEPIDOSAUROMORPHA ToL
|--SAUROPTERYGIA X (placodonts + plesiosaurs) MH
| |--Placodontia •X MH HCW08
| | |--Paraplacodus •X
| | `--+--Placodus •X
| | `--Cyamodontoidea •X
| | |--+--Cyamodus •X
| | | `--Henodus •X
| | `--Placochelyidae •X
| | |--Placochelys •X
| | `--Psephoderma •X
| `--Nothosauria X (plesiosaurs > placodonts)
| |--Wumengosaurus
| |--Pachypleurosauridae X MH Rieppel (1998), HCW08
| | |--Hanosaurus •X
| | `--+--+--Dactylosaurus •X
| | | `--Anarosaurus •X
| | `--+--Serpianosaurus •X S89--Neusticosaurus •X (O'K&S99)
| `--Eusauropterygia X (nothosaurs + plesiosaurs)
| |--Nothosauridae X (nothosaurs > plesiosaurs) MH
| | |--Keichousaurus •X HCW08
| | `--+--Simosaurus •X HCW08
| | `--+--Nothosaurus •X HCW08
| | `--+--Ceresiosaurus •X
| | `--Lariosaurus •X HCW08
| `--Pistosauroidea X (plesiosaurs > nothosaurs)
| |--Corosaurus •X HCW08
| `--+--Cymatosaurus •X R97
| `--+--Pistosaurus •X HCW08
| `--+--Yunguisaurus
| `--+--Augustasaurus
| `--Plesiosauria X MH
| |--Pliosauroidea X MH
| | |--Bishanopliosaurus •X
| | |--Thalassiodracon •X
| | `--+--Archaeonectrus •X
| | |--Eurycleidus •X
| | `--+--Rhomaleosauridae X MH
| | | |--Yuzhoupliosaurus •X
| | | `--+--Rhomaleosaurus •X
| | | `--+--Simolestes •X
| | | `--Leptocleidus •X
| | `--Pliosauridae X MH
| | |--Maresaurus •X
| | |--Macroplata •X
| | `--+--Kronosaurus •X
| | `--+--Peloneustes •X
| | `--+--Liopleurodon •X
| | `--+--Pliosaurus •X
| | `--Brachauchenius •X
| `--Plesiosauroidea X
| |--Attenborosaurus •X
| `--+--Plesiosaurus •X
| `--+--Eretmosaurus •X
| |--Sthenarosaurus •X
| `--+--Microcleidus •X
| `--+--Elasmosauridae •X MH
| `--Cryptocleidoidea X MH
| |--Cryptocleididae X
| | |--Colymbosaurus •X
| | |--Cryptocleidus •X
| | `--Muraenosaurus •X
| `--Tricleidia X
| |--Tricleidus •X
| `--+--Cimoliasauridae X
| | |--Kimmerosaurus •X
| | `--Cimoliasaurus •X
| `--Polycotylidae •X
| |--Plesiopleurodon •X
| `--+--Dolichorhynchops •X
| `--Trinacromerum •X
`--Lepidosauriformes MH
|--Kuehneosauridae •X
`--Lepidosauria
|--SPHENODONTIA
`--SQUAMATA
Alternate dendrogram, taking into account bone histology studies by Klein 2010, Hugi et al 2011, and Hugi 2011. Taxa for which there is information are in bold. The status of many taxa is uncertain due to lack of histological data:
SAUROPTERYGIA X
|?--Hanosaurus •X
|--+--Serpianosaurus •X --Neusticosaurus •X
| `--Nothosauridae X (nothosaurs > plesiosaurs)
| |--Keichousaurus •X
| `--+--Simosaurus •X
| `--+--Nothosaurus •X
| `--+--Ceresiosaurus •X
| `--Lariosaurus •X
`--+--+--+--Dactylosaurus •X
| | `--Anarosaurus •X
| `--Placodontia •X
| |--Paraplacodus •X
| `--+--Placodus •X
| `--Cyamodontoidea •X
| |--+--Cyamodus •X
| | `--Henodus •X
| `--Placochelyidae •X
| |--Placochelys •X
| `--Psephoderma •X
`--Pistosauroidea X (plesiosaurs > nothosaurs)
|--Corosaurus •X
`--+--Cymatosaurus •X
`--+--Pistosaurus •X
`--+--Yunguisaurus
`--+--Augustasaurus
`--Plesiosauria X
Here the placodont-nothosauria, and pachypleurosaur-eusauropterygia clades are replaced by a nothosaur-pistosaur topology, with the pachypleurosaurs spread among both (and perhaps also basal to botrh?) and the placodonts included with the pistosaurs. As with molecular-based studies, this gives a very different result to the conventional morphology-based analysis. MAK111102
| Page Back | Unit Home | Page Top | Page Next |
last revised ATW080330, MAK111102
Using this material. All material by ATW is public domain and may be freely used in any way (also any material jointly written by ATW and MAK). All material by MAK is licensed Creative Commons Attribution License Version 3.0, and may be freely used provided acknowedgement is given. All Wikipedia material is either Gnu Open Source or Creative Commons (see original Wikipedia page for details). Other graphics are copyright their respective owners