conodont

Thân thiện

A scientist examines a conodont fossil under a bright light.

Definition

1. Noun:
   • A small extinct eel-like vertebrate: A conodont was a small, extinct animal that resembled an eel, typically 2 to 8 inches (5 to 20 cm) long. It had a finned tail, a notochord (a primitive backbone), large eyes, and cone-shaped teeth made of cellular bone. It lived from the late Cambrian to the late Triassic periods.
   • A fossilized tooth element: A conodont is also the tiny, fossilized, cone-shaped tooth or feeding apparatus from this animal. These microscopic fossils are made of calcium phosphate and are commonly found in marine sedimentary rocks.

Usage Examples

• Noun (Animal):
  • Paleontologists study the conodont to understand early vertebrate evolution.
  • The conodont is considered a possible ancestor of modern jawless fish like lampreys.
• Noun (Fossil):
  • The rock layer was dated using abundant conodont fossils.
  • Under the microscope, the conodont's intricate shape was clearly visible.

Advanced Usage

• "Conodont element": A specific term used in paleontology to refer to an individual fossilized tooth or part of the feeding apparatus.
  • The assemblage contained several types of conodont elements.
• "Conodont biostratigraphy": The use of conodont fossils to date and correlate layers of sedimentary rock.
  • Conodont biostratigraphy is a crucial tool for dating Paleozoic rocks.

Variants and Related Words

• Conodonta (n): The scientific order to which these animals belong.
  • The order Conodonta includes a diverse array of early vertebrates.
• Conodontophorida (n): An alternative taxonomic name for the same group.
• Conodontologist (n): A scientist who specializes in the study of conodonts.

Synonyms

• Microfossil (for the fossil element): A general term for a fossil that must be studied microscopically.
• Agnathan (for the animal): Referring to its classification as a jawless vertebrate.

Related Phrases

• Conodont Alteration Index (CAI): A scale that measures the color change in conodont fossils due to heat, used to determine the thermal history of the rocks that contain them.
  • The high Conodont Alteration Index indicated the rocks had been subjected to significant geothermal heating.

Học thuật

Noun

1. small (2 inches long) extinct eellike fish with a finned tail and a notochord and having cone-shaped teeth containing cellular bone; late Cambrian to late Triassic; possible predecessor of the cyclostomes
2. the tiny fossil cone-shaped tooth of a primitive vertebrate of order Conodonta