In this article we will discuss about Phylum Annelida:- 1. Taxonomic Retrospect of Phylum Annelida 2. Definition and Fossil Record of Phylum Annelida 3. Habit and Habitat 4. Generalised Characters 5. Specialised Characters 6. Features 7. Trend in Classification 8. Phylogenetic Relationship 9. Locomotion 10. Circulatory System 11. Respiratory System 12. Reproductive System 13. Nervous System 14. Regeneration. Contents: Taxonomic [...]
List of three important members of Phylum Annelida:-1. Polychaetes 2. Oligochaetes 3. Hirudinea. Member # 1. Polychaetes: This group includes heterogeneous forms where variation is marked not only in size but also in habits and structural organisation. Following examples will illustrate the range of diversities: Arenicola: Burrows in sand; body is distinctly divisible into three regions—anterior region (or pre-branchial region) [...]
In this article we will discuss about Coelom of Annelida:- 1. Special Features of Coelom 2. Types of Coelom 3. Mode of Formation 4. Coelom in Different Groups 5. Views Regarding the Coelom Formation 6. Significance. Special Features of Coelom: 1. Developmentally coelom arises as a split in the mesoderm which becomes bifurcated into two layers, a somatic layer lying [...]