anaspida

Thân thiện

Anaspida fossils are displayed in a museum exhibit.

Definition

1. Noun:
   • An extinct order of jawless vertebrates: "Anaspida" refers to a specific taxonomic order of primitive, extinct fish-like vertebrates that lacked jaws. These were early aquatic animals, typically characterized by their bony armor and considered part of the broader group of jawless fishes (Agnatha).

Usage Examples

• Noun:
  • Fossil evidence suggests the Anaspida were small, armored fish that lived during the Silurian and Devonian periods.
  • The Anaspida are an important group for understanding the early evolution of vertebrates.

Advanced Usage

• In paleontological context: The term is used technically to discuss evolutionary biology and fossil records.
  • The phylogenetic position of the Anaspida among jawless vertebrates is still debated by researchers.

Variants and Related Words

• Anaspid (noun): A member of the order Anaspida.
  • The anaspid fossil was remarkably well-preserved.

Synonyms

• Jawless fish (Agnatha): A broader superclass that includes Anaspida and other orders like Osteostraci.
  • Note: "Agnatha" is a more general term, while "Anaspida" specifies a particular order within it.

Related Terms

• Osteostraci: Another order of extinct jawless vertebrates, often studied alongside Anaspida.
• Heterostraci: A different order of armored, jawless fish from the same era.

Học thuật

Noun

1. extinct order of jawless vertebrates

Từ đồng nghĩa

• Anaspida
• order Anaspida