5 Questions
What is a notochord?
A flexible, rod-shaped cartilage found inside the embryo of a chordate
How are chordates divided?
Into vertebrates and invertebrates
What is the defining characteristic of vertebrates?
Possession of a backbone or spinal column
How many known species in the world are vertebrates?
Approximately 45,000
What happens to the notochord in most vertebrates?
It is replaced with a vertebral or spinal column
Study Notes
Notochord
- Supportive rod present in chordates
- Flexible rod-like structure found ventral to the nerve cord
- Provides support and structure during development
Divisions of Chordates
- Chordates are divided into three subphyla: Cephalochordata, Urochordata, and Vertebrata
- Cephalochordates include organisms like Lancelets
- Urochordates include Tunicates or sea squirts
- Vertebrates include animals with a backbone
Defining Characteristic of Vertebrates
- Vertebrates are characterized by having a backbone or spinal column
- Backbone provides structural support and protection for the spinal cord
- Includes animals like mammals, birds, reptiles, amphibians, and fish
Number of Vertebrate Species
- There are approximately 65,000 known vertebrate species in the world
- Vertebrates represent a diverse group of animals with varying characteristics and adaptations
Fate of the Notochord in Vertebrates
- In most vertebrates, the notochord is replaced by the vertebral column during development
- Vertebral column provides more support and protection compared to the notochord
- Notochord usually disappears or transforms into other structures as the vertebrate matures
Test your knowledge of animal anatomy and classification with this quiz! Explore the fascinating diversity of animal life and learn about the unique features that help different animals survive in their environments. From notochords to pharyngeal slits, discover the commonalities and differences among various animal species.
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