ictodosaur

Thân thiện

A small ictodosaur rests on a mossy log in a prehistoric forest.

Definition

Noun: 1. An extinct reptile intermediate in form between therapsids and the most primitive true mammals: An ictodosaur is a member of an extinct order (Ictidosauria) of small, advanced reptile-like synapsids, representing a transitional evolutionary stage.

Usage Notes

• The term "ictodosaur" is a highly specialized scientific term used almost exclusively in paleontology and evolutionary biology.
• It refers to a specific taxonomic group, not a single species. Therefore, it is typically used in the singular to refer to a member of the group or in the plural ("ictodosaurs") to refer to the group collectively.
• It is a formal noun and is not used in everyday language.

Examples of Usage

• Noun:
  • The fossil record suggests the ictodosaur possessed features of both reptiles and early mammals.
  • Paleontologists study ictodosaurs to understand the transition from synapsid reptiles to mammals.
  • This particular skeleton is classified as an ictodosaur.

Advanced Usage

• In evolutionary context: The term is used to describe an organism's position on the evolutionary tree.
  • The ictodosaur is considered a key transitional form in synapsid evolution.

Variants and Related Words

• Ictidosauria (n): The taxonomic order to which ictodosaurs belong.
• Therapsid (n): The "mammal-like reptile" group from which ictodosaurs evolved.
• Cynodont (n): A subgroup of therapsids that are even closer to mammals; ictodosaurs are sometimes considered advanced cynodonts.

Synonyms

• Transitional fossil (general term)
• Advanced cynodont (in some taxonomic classifications)

Different Meanings

• There are no other common meanings for this word outside of its specific paleontological definition.

Học thuật

Noun

1. intermediate in form between the therapsids and most primitive true mammals