The below mentioned article provides a brief account of torsion and detorsion in Gastropoda. Torsion in Gastropoda: Mollusca are typically bilaterally symmetrical animals but this symmetry is lost in Gastropoda due to two processes called coiling and torsion. There is a tendency for digestion and resorption to be confined to a dorsal digestive gland or liver, the liver undergoes growth [...]
The following points highlight the top twenty characteristics of Archimollusc. 1. The archimollusc was a sluggish animal, creeping slowly over the hard surfaces in shallow water. 2. Archimollusc had a flattened body which was perfectly bilateral in symmetry. 3. There was no trace of segmentation but it had an anterior mouth and a posterior anus. 4. It had a [...]
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. [...]