snakes

"Lacertilla", from Ernst Haeckel's Artforms of Nature, 1904

Fossil range: Jurassic - Recent
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Order: Squamata
Suborder: Lacertilia, Günther, 1867

Lizards are reptiles of the order Squamata, which they share with the snakes (Ophidians). They are usually four-legged, with external ear openings and movable eyelids. Species range in adult length from a few centimeters (some Caribbean geckos) to nearly three meters (Komodo dragons).

Scientific classification
Kingdom: Animalia 
Phylum: Chordata 

Class: Sauropsida 
Order: Squamata, Oppel, 1811

Suborders
Lacertilia- Lizards
Serpentes - Snakes
Amphisbaenia - Worm lizards

"Chelonia" from Ernst Haeckel's Kunstformen der Natur, 1904

Lepidosaurians
Scientific classification
Kingdom: Animalia 
Phylum: Chordata 
Class: Sauropsida 
Subclass: Diapsida 
Infraclass: Lepidosauromorpha 
Superorder: Lepidosauria 
Orders: Sphenodontia, Squamata