In this article we will discuss about Sagitta:- 1. Habit and Habitat of Sagitta 2. External Structures of Sagitta 3. Body Wall 4. Coelom 5. Digestive System 6. Circulatory, Respiratory and Excretory Systems 7. Nervous System 8. Reproductive System 9. Development. Habit and Habitat of Sagitta: Sagitta is a marine planktonic animal which lives throughout […]
Sagitta: An Example of Phylum Chaetognatha
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Top 6 Theories Regarding the Origin of Metazoa
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The following points highlight the top six theories regarding the origin of metazoa. The theories are: 1. Syncytial-Ciliate Theory 2. Colonial Flagellate Theory 3. Colonial Blastea and Planula Theories 4. Gastraea Theory 5. Monophyletic Origin of Metazoans 6. Polyphyletic Origin of Metazoans. 1. Syncytial-Ciliate Theory: The origin of metazoans probably took place through the growth, […]
Echinoderms: Classification, Habitat and Affinities
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In this article we will discuss about Echinoderms:- 1. Taxonomic Retrospect of Echinoderms 2. Definition and Origin of Echinoderms 3. Classification 4. Phylogenetic Considerations 5. Research 6. Habit and Habitat 7. Size 8. Shape and Symmetry 9. Body Wall and Skeleton 10. Digestive System 11. Coelom 12. Haemal System or Blood Lacunar System 13. Excretory […]
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