archosaur
Noun: 1. A member of a major group of reptiles: An "archosaur" is any member of the large group Archosauria, which includes all extinct reptiles like dinosaurs, pterosaurs, and their living descendants, the crocodilians and birds. They are characterized by features such as teeth set in sockets and openings in the skull behind the eyes.
The word "archosaur" is a scientific term used primarily in paleontology and zoology to classify a specific lineage of reptiles. It refers to the group as a whole or to any individual member of that group. - The discovery of the fossil helped scientists understand the evolution of early archosaurs. - Birds are considered modern archosaurs.
- "Archosaurian" (adjective): Relating to or characteristic of archosaurs.
- The fossil exhibited clear archosaurian features in its skull structure.
- Archosauria: The scientific name for the larger clade or group to which all archosaurs belong.
- Thecodont (historical term): An older term for various early, primitive archosaurs. Note: "Thecodont" is largely obsolete in modern cladistics but is listed in the reference context.
The term "archosaur" has a single, specific meaning in scientific classification. It does not have common alternative meanings in everyday language.
- Ruling reptile (a descriptive, informal synonym reflecting the meaning of "Archosauria").
The provided reference context lists specific subgroups (dinosaurs, plesiosaurs, etc.). It is important to note that modern scientific understanding classifies birds as living archosaurs, while some groups listed (like plesiosaurs and ichthyosaurs) are now often considered outside the true archosaur lineage. The definition above reflects the core, consensus membership of the group.
- extinct reptiles including: dinosaurs; plesiosaurs; pterosaurs; ichthyosaurs; thecodonts