In this article we will discuss about Hagfish:- 1. Introduction to Hagfish 2. Habit and Habitat of Hagfish 3. External Structures 4. Digestive System 5. Respiratory System 6. Circulatory System 7. Nervous System 8. Excretory System 9. Reproductive System 10. Development 11. Affinities and Systematic Position. Contents: Introduction to Hagfish Habit and Habitat of Hagfish External Structures of Hagfish Digestive [...]
In this article we will discuss about Lampreys:- 1. Subject Matter of Lampreys 2. Habit and Habitat of Lampreys 3. External Structures 4. Skeletal Structures 5. Digestive System 6. Respiratory System 7. Circulatory System 8. Arterial System 9. Venous System 10. Nervous System 11. Excretory System 12. Reproductive System 13. Development. Contents: Subject Matter of Lampreys Habit and Habitat of [...]
In this article we will discuss about the modern concept on the phylogenetic status of cyclostomata. In this history of vertebrate evolution the cyclostomes occupy a doubtful status. Diverse opinions exist on the relative status of the cyclostomes in the vertebrate series. Cyclostomes are generally regarded to be lower in structural organisation than the fishes (Gnathostoma) but higher than Branchiostoma [...]