BIOL 2325 Chapter Notes - Chapter 10: Plant Reproductive Morphology, Veliger, Nacre
Document Summary
Feeding, cephalic sensory, locomotor organs, muscular actions. Head has a mouth, radula, sensory organs, and foot. Creeping movement via waves of muscular contractions. Mantle-sheath of skin that protects soft parts of body. The exposed surface is used for gas exchange. Products from bodily functions empty into cavity. In aquatic molluscs, surface cilia move water. Shell is secreted and lines by mantle. Shell has 3 layers: periostractum, middle prismatic, nacre. Gas exchange via surface of mantle, gills, and lungs. Small low rounded shells and creeping foot. Sensory sub-radular organ extrudes and explored for algae. Eggs released in strings or masses of jelly. Feeds on detritus via mucus-covered ciliated tentacle or foot. Respiratory water circulates through mantle via foot. Operculum-hard proteinaceous plate covering shell aperture when body withdrawals. Torsion-twisting process during development which renders visceral mass asymmetrical* Development-trochophore larval stage and veliger larval stage(shell arrives) Veliger- 2 ciliated veler lobbes for locomotion. Left goes to right and vice versa.
