what are archosaurs and what is the defining feature

These muscles helped retract and pull back their legs during locomotion. In evolutionary terms, dinosaurs were the land-dwelling descendants of the archosaurs, egg-laying reptiles that survived the Permian-Triassic extinction event 250 million years ago. 4. hat are archosaurs, and what is their defining feature? Describe the similarities you observed. Archosaurs split into two major groups 250 million years ago. Archosaur Archosaurs are a group of diapsid amniotes and are broadly classified as reptiles. Their thigh bones are almost parallel to the ground. Examine the hip joint structure and choose the bone that is most similar to the chicken hip joint.

6. 4. The living representatives of this group consist of birds and crocodilians. Their descendants eventually split into two lines. What are those groups? Unlike other archosaurs and most other animals, dinosaurs had a bone feature, known as the fourth trochanter, where these muscles attached to the femur. Examining Teeth in Sockets - Crocodilians (Archosauria) Team members at Everything Dinosaur were given the opportunity to examine the skull of a large Gharial recently.
3. Technically, dinosaurs can be distinguished from the other animals descended from archosaurs (pterosaurs and crocodiles) by a handful of anatomical quirks. Euparkeria was a small (about 1 meter long) but relatively long-limbed reptile that possessed antorbital fenestrae, a key feature of all archosaurs. ... All descended from egg-laying reptiles known as archosaurs. Defining a dinosaur is now far harder ... Today, only one fossil feature can be attributed solely to members of Dinosauria. What distinguishes dinosaurs from other reptiles? Based on the hip joints shown on the right, is the crocodile or the dinosaur more similar to the chicken? This group also includes all extinct dinosaurs, pterosaurs, and extinct relatives of crocodilians. 6.8). They walk and run with a side-to-side motion. 5. That is a complete hole in the hip socket of a fossil. What features are shared by those two animal’s hip joints? These once widespread and diverse members of the Gavialidae are extremely rare in the

Reptiles, such as crocodiles and lizards, have legs that sprawl out to the side. Archosaurs split into two major groups 250 million years ago.

5.
All archosaurs had a caudofemoralis musculature–a large set of muscles that extend from the tail to the femur. What are archosaurs and what is the defining feature of this group? A likely representative fossil for a common ancestor of the archosaurs is the Early Triassic Euparkeria of South Africa (Fig. 6. What are those groups? The gharial (Gavialis gangeticus), has evolved a long, elongated snout and specialises in catching fish (piscivore).


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