plesiosauri

Definition

Noun (plural of plesiosaurus or plesiosaur):
A group of extinct marine reptiles from the Mesozoic Era, characterized by a long neck, small head, broad body, and four flippers. They are not dinosaurs but belong to the order Plesiosauria.

Usage Examples

• (The museum exhibited the fossilized remains of multiple plesiosaurs.)
• (These marine reptiles inhabited seas millions of years ago.)

Advanced Usage

• "plesiosauri" as a scientific term: Used in paleontology to refer collectively to members of the suborder Plesiosauria.
  • The classification of plesiosauri has been revised based on new fossil evidence. (The taxonomic grouping of these reptiles has been updated.)

Variants and Related Words

• Plesiosaur (n): singular form; one individual of this group.
  • A single plesiosaur was found in the quarry. (One such reptile was discovered.)
• Plesiosaurus (n): a genus within Plesiosauria, often used as a general term.
  • Plesiosaurus was one of the first plesiosaurs to be described. (This genus was among the earliest identified.)
• Plesiosaurian (adj): relating to plesiosaurs.
  • The plesiosaurian fossils show adaptations for swimming. (The remains reveal features for aquatic life.)

Synonyms

• Marine reptile: a broader term for any reptile adapted to sea life (includes ichthyosaurs, mosasaurs).
• Long-necked reptile: a descriptive synonym emphasizing their distinctive neck.

Related Idioms

• "Like a plesiosaur in the fossil record": a rare or unexpected discovery.
  • Finding that document was like a plesiosaur in the fossil record — completely unexpected. (A surprising and valuable find.)