What are the feactures of phylum Annelida
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features of PHYLUM Annelida:
1. Triploblastic animals with bilateral symmetry.
2. Body soft, vermiform and more or less elongated.
3. Body metamerically segmented and covered by a thin cuticle which protects the body.
4. Head comprised of prostomium and peristomium. Prostomium contains head and sensory appendages.
5. Locomotory organs of Phylum Annelida are epidermal chitinous bristles, called setae or chaetae (lost in leeches and in a few groups of polychaetes).
6. Body cavity of Phylum Annelida is a true coelom which lies between the two layers of mesoderm.
7. Digestive tract straight, tubular running from the anterior mouth to the posterior anus.
8. Digestion is completely extracellular in Phylum Annelida.
9. Gas exchange performed either by general body surface, provided that it is kept moist, or by gills in some tube- dwellers (e.g., Arenicola, Cirratulus, etc.).
10. Closed blood vascular system with dorsal and ventral longitudinal vessels connected by smaller vessels. The dorsal vessel acts as pumping vessel. The closed, circulatory system is reduced or absent in leeches.
11. Respiratory pigments are red haemoglobins or green chlorocruorins. Both pigments are found in blood plasma, not in the R.B.C. as found in vertebrates. Haemerythrin is also present in some polychaetes.
12. Nervous system represented by cerebral ganglia (supra-pharyngeal ganglia) and double ventral nerve cord with segmentally arranged ganglia and lateral nerves.
13. Excretory system are nephridia (protonephridia) in some, and segmentally coiled tubes open at both ends, called metanephrfdia.
14. Animals often provided with coelomoducts which are channels for the outward passage of reproductive elements.
15. Gonads develop from coelomic epithelium.
16. Sexes united or separate (gonochoristic), e.g., polychaetes.
17. Development direct (e.g., Oligochaeta or Hirudinea) or indirect (e.g., Polychaeta, Archiannelida).
18. Cleavage spiral.
19. Larval stage when present is a trochophore.
Hope it will help yoU *-*
1. Triploblastic animals with bilateral symmetry.
2. Body soft, vermiform and more or less elongated.
3. Body metamerically segmented and covered by a thin cuticle which protects the body.
4. Head comprised of prostomium and peristomium. Prostomium contains head and sensory appendages.
5. Locomotory organs of Phylum Annelida are epidermal chitinous bristles, called setae or chaetae (lost in leeches and in a few groups of polychaetes).
6. Body cavity of Phylum Annelida is a true coelom which lies between the two layers of mesoderm.
7. Digestive tract straight, tubular running from the anterior mouth to the posterior anus.
8. Digestion is completely extracellular in Phylum Annelida.
9. Gas exchange performed either by general body surface, provided that it is kept moist, or by gills in some tube- dwellers (e.g., Arenicola, Cirratulus, etc.).
10. Closed blood vascular system with dorsal and ventral longitudinal vessels connected by smaller vessels. The dorsal vessel acts as pumping vessel. The closed, circulatory system is reduced or absent in leeches.
11. Respiratory pigments are red haemoglobins or green chlorocruorins. Both pigments are found in blood plasma, not in the R.B.C. as found in vertebrates. Haemerythrin is also present in some polychaetes.
12. Nervous system represented by cerebral ganglia (supra-pharyngeal ganglia) and double ventral nerve cord with segmentally arranged ganglia and lateral nerves.
13. Excretory system are nephridia (protonephridia) in some, and segmentally coiled tubes open at both ends, called metanephrfdia.
14. Animals often provided with coelomoducts which are channels for the outward passage of reproductive elements.
15. Gonads develop from coelomic epithelium.
16. Sexes united or separate (gonochoristic), e.g., polychaetes.
17. Development direct (e.g., Oligochaeta or Hirudinea) or indirect (e.g., Polychaeta, Archiannelida).
18. Cleavage spiral.
19. Larval stage when present is a trochophore.
Hope it will help yoU *-*
Those are features of PHYLUM Annelida
I didn't mean that
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