The upcoming discussion will update you about the difference between protochordates and higher chordates. Difference # Protochordates: 1. Notochord persists throughout life. 2. No cranium or vertebral column. 3. Atrium, the space in between pharynx and body wall, is present. 4. Endostyle is present except hemichordates. It is the precursor of thyroid gland of higher vertebrates. 5. Absence of neural [...]
Get the answer of: Is Balanoglossus a 'Forerunner' of Chordates. According to any standard dictionary 'forerunner' means 'one who runs ahead' or 'messenger sent before'. So the claim that 'Balanoglossus is a forerunner of chordates' signifies that it stands at the pivotal stage in the direct line of chordate evolution. But this claim is not universally accepted nowadays. This is [...]
In this article we will discuss about Herdamania:- 1. Habit and Habitat of Herdamania 2. External Structures of Herdamania 3. Body Wall 4. Coelom and Atrium 5. Locomotion 6. Digestive and Respiratory Systems 7. Circulatory System 8. Excretory System 9. Nervous System 10. Reproductive System 11. Affinities and Systematic Position. Contents: Habit and Habitat of Herdamania External Structures of Herdamania [...]