placodermi

Thân thiện

Placodermi were ancient armored fish that swam in prehistoric seas.

Definition

1. Noun:
   • An extinct taxonomic group of armored fish: Placodermi refers to a class of prehistoric, jawed vertebrates characterized by their distinctive bony plates covering the head and thorax. They are among the earliest known jawed fishes.

Usage Examples

• Noun:
  • Fossils of the Placodermi provide crucial evidence for the early evolution of jaws.
  • The museum's exhibit features a reconstructed skeleton of a member of the Placodermi.

Advanced Usage

• Scientific Context: The term is used almost exclusively in paleontological and evolutionary biological contexts to discuss early vertebrate life.
  • The study focused on the diversification of Placodermi during the Devonian period.

Variants and Related Words

• Placoderm (n): A member of the Placodermi class; an individual armored fish.
  • Dunkleosteus is a famous genus of placoderm.

Synonyms

• Armored fish: A descriptive, non-scientific term for these organisms.
• Bony-plated fishes: Another descriptive phrase referencing their key characteristic.

Notes on Meaning

• The term "Placodermi" is a fixed scientific classification. It is not used in everyday language and has no other common meanings or idioms.

Học thuật

Noun

1. extinct group of bony-plated fishes with primitive jaws

Từ đồng nghĩa

• Placodermi
• class Placodermi