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 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 [...]
In this article we will discuss about Neanthes Virens:- 1. Habit, Habitat and Distribution of Neanthes Virens 2. External Features of Neanthes Virens 3. Locomotion 4. Body Wall 5. Coelom 6. Digestive System 7. Respiration 8. Blood Vascular System 9. Excretory System 10. Nervous System 11. Sense Organs 12. Reproductive System and Others. Contents: Habit, Habitat and Distribution of Neanthes [...]