The following points highlight the twenty representative types of Molluscs. The types are: 1. Chiton 2. Neopilina Galatheae 3. Haliotis 4. Fissurella 5. Patella 6. Aplysia 7. Doris 8. Eolis 9. Limax 10. Dentalium 11. Mytilus 12. Pecten 13.Ostrea 14. Teredo 15. Solen 16. Sepia 17. Loligo 18. Octopus 19. Argonauta 20. Nautilus. Molluscs: Type # 1. Chiton: Chiton (Fig. [...]
Pheretima: Habit and Habitat and External Features ! Habit and Habitat of Earthworms: The earthworms are burrowers. They are found in the soil rich in decaying organic matters usually in gardens, pastures, lawns, irrigated farm lands, near the banks of the ponds, lakes and rivers. The do not prefer to live in sandy, clay and acid soils which are deficient [...]
Excretory System of Nephridia (Earthworm)! These are of three types according to their location in the body: 1. Septal nephridia; 2. Integumentary nephridia 3. Pharyngeal nephridia. 1. Septal Nephridia: These are found situated on the inter-segmental septum between 15th and 16th segments to the posterior side of the body. Each septum bears nephridia on both the surfaces arranged in semicircles [...]