saurischian
Definition
Noun: A saurischian is a member of the Saurischia, one of the two major orders of dinosaurs. This group is characterized by a three-pronged pelvic structure where the pubis bone points forward, similar to the pelvis of a crocodile or a lizard. Saurischians include both carnivorous (theropods) and herbivorous (sauropodomorphs) dinosaurs.
Usage Examples
- Noun:
- The Tyrannosaurus rex is a famous example of a carnivorous saurischian.
- The massive, long-necked Apatosaurus was a herbivorous saurischian.
Advanced Usage
- In Paleontological Classification: The term is used to distinguish dinosaurs from the other major order, the Ornithischia ("bird-hipped" dinosaurs). Despite the name "lizard-hipped," birds are actually descended from theropod saurischians.
- The discovery helped clarify the evolutionary relationship between theropod saurischians and modern birds.
Variants and Related Words
- Saurischia (n): The scientific order name to which all saurischians belong.
- The order Saurischia is divided into two main groups: Theropoda and Sauropodomorpha.
Synonyms
- Lizard-hipped dinosaur: A descriptive synonym based on the pelvic structure.
Antonyms
- Ornithischian: A member of the other major dinosaur order characterized by a "bird-hipped" pelvis.
Noun
-
herbivorous or carnivorous dinosaur having a three-pronged pelvis like that of a crocodile
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