Saurischia

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Definition

Noun 1. A major order of dinosaurs: Saurischia is one of the two primary divisions of dinosaurs, characterized by a pelvic structure where the pubis bone points forward. This order includes both carnivorous theropods (like Tyrannosaurus) and herbivorous sauropods (like Brachiosaurus).

Usage Examples
  • Noun:
    • The fossil record clearly distinguishes between the two main groups of dinosaurs: Saurischia and Ornithischia.
    • All known carnivorous dinosaurs, such as velociraptors, belong to the order Saurischia.
    • The massive, long-necked sauropods are a subgroup within Saurischia.
Advanced Usage
  • In taxonomic context: The term is used in scientific classification to define a clade based on specific hip bone morphology.
    • The discovery of the early dinosaur Herrerasaurus helped paleontologists understand the evolution of Saurischia.
Variants and Related Words
  • Saurischian (adj/n): Of or belonging to the order Saurischia; a member of this order.
    • The saurischian hip structure is considered the ancestral condition for dinosaurs.
Synonyms
  • Lizard-hipped dinosaurs: A common descriptive synonym referring to the forward-pointing pubis bone, which resembles the pelvic arrangement of modern lizards.
Related Terms (Contextual)
  • Ornithischia: The other major order of dinosaurs, characterized by a "bird-hipped" pelvic structure.
  • Theropod: A suborder of mostly carnivorous saurischian dinosaurs.
  • Sauropodomorpha: A suborder of herbivorous, often gigantic, saurischian dinosaurs.
Noun
  1. extinct terrestrial reptiles: theropods (carnivorous); sauropods (herbivorous)

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