Page 1 - 2.Lesson Notes -Animalia-vertebrata

SAI International School
Subject- Biology, Class-IX
Chapter- Diversity in living organisms
Sub Topic- Animalia: Vertebrata

Module- 29
Lesson Notes

Chordata/Vertebrata

• Presence of dorsal, tubular, hollow nerve cord.
• Presence of notochord.
• Presence of pharyngeal gill slits.

• Presence of post-anal tail.
• Bilaterally symmetrical body.
• Presence of three germ layers.
• Organ-system level of organization.

• Except for a few primitive forms, the animals have vertebral column instead of
the notochord. These animals are called vertebrates.

Pisces

• Class Pisces include all bony and cartilaginous fishes.

• They are exclusively aquatic.
• Body is streamlined with paired and unpaired fins.
• These are cold-blooded vertebrates
• Heart is two-chambered.

• Lateral line system is well developed.
• Examples: Sharks, Rays, Rohu, Mrigal, Green carp etc