The phylum Mollusca contains over 100,000 species with a variety of body forms and lifestyles. In mollusks, the coelom is reduced and limited to the region around the heart. The Mollusk body first appeared during the Cambrian Period. All mollusks have: 1. A visceral mass containing internal organs, including the digestive tract, paired kidneys, and reproductive organs. 2. A mantle [...]
In this article we will discuss about:- 1. Description of Lamellidens 2. External Features of Lamellidens 3. Microscopic Structure 4. Muscles 5. Locomotion 6. Body Cavity 7. Digestive System 8. Respiratory System 9. Circulatory System 10. Heart and Pericardium 11. Excretory System 12. Pericardial Gland 13. Nervous System 14. Receptors and Sense Organs in Lamellidens 15. Reproductive System 16. Fertilization [...]
The following points highlight the top two types of respiration in mollusca. The types are: 1. Aquatic Respiration 2. Terrestrial Respiration. Type # 1. Aquatic Respiration: In this, O2 dissolved in water is used. The surface of the respiratory structure is greatly increased to allow rapid absorption of O2. The aquatic respiratory structures may be placed under two heads—primary and [...]