Diapsida
The Vertebrates Dendrogram

Diapsida: Dendrogram

Abbreviated Dendrogram
Amniota ├─Synapsida └─Sauropsida ├─Anapsida ╘═Eureptilia │ └─Diapsida ╞═Araeoscelida └─Neodiapsida ╞═"Younginiformes" └─┬─Ichthyosauria └─Sauria ├─Lepidosauromorpha └─Archosauromorpha
Contents

Overview
Diapsida
Araeoscelida
Neodiapsida
Younginiformes
Claudiosaurus
Weigeltisauridae
Thalattosauria
Saurosphargidae
Omphalosaurus
Hupehsuchia
Classification
Dendrogram
References


The following is an unfortunately rather uninformative dendrogram. On the one hand, little phylogenetic work has been done with groups like the Hupehsuchia who are shown with a flattened bush arrangement that one gets from simply translating a low-phylo information Linnaean taxonomy to a cladistically-based dendrogram without adding any new input. On the other hand, the extreme specialisations of some of these early taxa, and lack of widely applicable synapomorphies, render any actual cladistic analysis dubious to the extreme. Hence the placement of even higher grade taxa like the ichthyosaurs on this tree should be taken as tentative and provisional MAK111116


Reptiliomorpha ├─Synapsida └─┬─Anapsida ╘═╤═Eureptilia └─○Diapsida MH, ToL ╞═Araeoscelida (probably paraphyletic, i.e. Aeroscelida = Diapsida)) │ ├─Spinoaequalis │ └─┬─Petrolacosaurus │ └─Araeoscelis └─○Neodiapsida MH ├─Orovenator └─┬─Lanthanolania ├─Youngina " Younginiformes" (paraphyletic) ├─Thadeosaurus └─┬─○Tangasaurinae │ ├─Tangasaurus │ └─┬─Hovasaurus │ └─Acerosodontosaurus └─┬─Claudiosaurus └─┬─○Weigeltisauridae │ ├─Weigeltisaurus │ └─Coelurosauravus └─┬─┬─┬─┬─○Thalattosauria/Thalattosauriformes │ │ │ ├─Askeptosauroidea │ │ │ │ ├─Endennasaurus │ │ │ │ └─Askeptosauridae │ │ │ └─Thalattosauroidea │ │ │ ├─┬─Nectosaurus │ │ │ │ └─Xinpusaurus │ │ │ └─Thalattosauridae │ │ │ └─┬─Thalattosaurus │ │ │ └─Claraziidae │ │ └?─○Saurosphargidae │ │ ├─Saurosphargis │ │ └─Sinosaurosphargis │ └─Ichthyosauria ├?─Omphalosaurus ├?─○Hupehsuchia │ ├─Hupehsuchus │ ├─Nanchangosaurus │ ├─Unnamed species (SSTM 5025) │ └─Unnamed species (V4070) └─○Sauria MH ├?─Choristodera ├─Lepidosauromorpha └─Archosauromorpha

contact us

New page MAK111116

Creative Commons License
Unless otherwise noted,
the material on this page may be used under the terms of a
Creative Commons License.