2018 Ancestor's Trail Hike   

Tracing our common ancestry with all other multicellular life 
over the last billion years of evolutionary time. 
A 12.5k hike where each average stride = 60,000 years. 
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310mya Sauropsids

 

The concestor of all reptiles (including turtles, lizards, snakes and dinosaurs) and the precursor of birds evolve.

 Sauropsida ("lizard faces") is a group of amniotes that includes all existing reptiles and birds and their fossil ancestors, including the dinosaurs, the immediate ancestors of birds. Sauropsida is distinguished from Synapsida, which includes mammals and their fossil ancestors.

 The cladogram presented here illustrates the "family tree" of sauropsids, and follows a simplified version of the relationships found by Laurin and Gauthier (1996), presented as part of the Tree of Life Web Project.[10]

Sauropsida
unnamed
Anapsida
 

Mesosauridae Mesosaurus BW.jpg

 
unnamed
 

Millerettidae Milleretta BW.jpg

 
unnamed
 

Lanthanosuchidae

 
unnamed
 

Nyctiphruretia

 
unnamed
 

Pareiasauria Scutosaurus BW.jpg

 
 

Procolophonoidea Hypsognathus BW.jpg

 
 
 

?Testudines (turtlestortoises, and terrapinsFlorida Box Turtle Digon3 re-edited.jpg

 
 
 
 
 
Romeriida
 

Captorhinidae Captorhinus BW.jpg

 
unnamed
 

Protorothyrididae* Hylonomus BW.jpg

 
Diapsida
 

Araeoscelidia Petrolacosaurus BW.jpg

 
unnamed
 

Younginiformes Hovasaurus BW.jpg

 
Sauria
 

?Ichthyosauria Mixosaurus BW.jpg

 
 

?Sauropterygia Thalassiodracon BW.jpg

 
 

Lepidosauromorpha (lizardssnakestuatara, and their extinct relatives) Plumed.basilisk.750pix.jpg Coast Garter Snake.jpg Sphenodon punctatus in Waikanae, New Zealand.jpg

 
 

Archosauromorpha (crocodilesbirds, and their extinct relatives) Chinese alligator and rhea.jpgHatzegopteryx BW.jpgStegosaurus BW.jpg

 

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