Sauropsida (Greek for "lizard faces") is a clade of amniotes, broadly equivalent to the class Reptilia, though typically used in a broader sense to also include extinct stem-group relatives of modern reptiles and birds (which, as theropod dinosaurs, are nested within reptiles as more closely related to crocodilians than to lizards or turtles). [2]

Sauropoda (/ s ɔː ˈ r ɒ p ə d ə /), whose members are known as sauropods (/ ˈ s ɔːr ə p ɒ d z /; [1] [2] from sauro-+ -pod, 'lizard-footed'), is a clade of saurischian ('lizard-hipped') dinosaurs.Sauropods had very long necks, long tails, small heads (relative to the rest of their body), and four thick, pillar-like legs. They are notable for the enormous sizes attained by some ...

Sauropsida includes most of what was clasically known as "Reptilia" along with birds which are in effect glorified reptiles) and of course dinosaurs. Sauropsids therefore are the bulk of the reptiles plus birds, while Synapsids are the "mammal-like reptiles" plus mammals.

Sauropsida Sauropsids are a group of land vertebrates which includes all existing reptiles and birds and their fossil ancestors . They are one of the two groups which evolved from egg-laying amniotes in the first part of the Carboniferous period.

Apr 6, 2025 · Sauropod, any member of the dinosaur subgroup Sauropoda, marked by large size, a long neck and tail, a four-legged stance, and a herbivorous diet. These reptiles were the largest of all dinosaurs and the largest land animals that ever lived. Sauropods shared a body plan consisting of: a small head

When Sauropsida was used, it often had the same content or even the same definition as Reptilia. In 1988, Jacques Gauthier proposed a cladistic definition of Reptilia as a monophyletic node-based crown group containing turtles, lizards and snakes, crocodilians, and birds, their common ancestor and all its descendants.

Sauropsida is defined by Laurin and Reisz, 1995 as: "The last common ancestor of mesosaurs, testudines and diapsids, and all its descendents." AKA: Min ∇ ( Mesosaurus , Testudines, Diapsida)

While Sauropsida evolved a highly calcified impermeable egg shell to prevent evaporation of fluids from their eggs, the earliest Synapsids, instead, presumably used the “parchment” shell's permeability to replenish evaporated fluids with liquid secretions from their glandular skin, similar to existent amphibians with terrestrial eggs, such ...

Feb 22, 2024 · Sauropsida is a taxonomic clade that includes all reptiles, birds, and their extinct relatives like dinosaurs, pterosaurs, and plesiosaurs. The key unifying feature of sauropsids is their skull morphology – specifically the presence of two openings behind the eye socket known as temporal fenestrae.

Oct 7, 2024 · Sauropsida (lizard faces) is a group of amniotes that includes all existing birds and reptiles as well as their fossil ancestors and other extinct relatives. Large land animals are either in this group or in its sister group, Synapsida, which includes mammals and their fossil relatives.