| A | B |
|---|
| trochophore | The larval form of a mollusc is known as a:(n) __________ _ |
| shell | Most molluscs have a protective cover over their body known as a(n0 _____ |
| coelom | Molluscs are the first creatures we have studied that have a true body cavity known as a(n) __________ |
| mantle | The folded dorsal wall of a mollusc makes up |
| locomotion | Characteristic for classifying molluscs |
| open | Type of circulatory system for most molluscs |
| radula | scraping mouth part |
| mantle | part that secretes substance that makes up the shell |
| sinistral | left side (hand) shell |
| Eucoelomate | true body cavity |
| mollusca | soft body |
| mantle | Houses gills (ctenidia), secretes shell, encloses body. |
| Class Bivalvia | Only class without radula. Filter feeders. Include clams, oysters, scallops, "shipworms" No head. |
| Class Gastropoda | contains 75-80% of all animals in Phylum. "stomach-footed animal". Large ventral foot. |
| Class Scaphopoda | "tusk-footed" or "tooth-footed" animals |
| open circulation | body fluid (hemolymph) bathes the organs directly |
| Class Cephalopoda | "Head-footed animals". ALL marine predators. Include: squid, octupus, nautilus. |
| bivalve | mollusks having a soft body with platelike gills enclosed within two shells hinged together |
| visceral mass | area beneath the mantle of a mollusk that contains the internal organs |
| gills | organs that exchange oxygen and carbon dioxide with water |
| umbo | oldest part of the shell of a bivalve from which the shell grows |
| operculum | It is a piece of shell attached to the foot of the gastropod. Used to seal the aperture when the organism is inside it's shell which provides protection from predators and drying out. |
| labial palps | structures surrounding the mouth that trap and manipulate the food |
| bivalves | has a two part hinged shell |
| cephalopods | class of molluscs that have closed circulatory system |
| Class Gastropoda | Memebers of this class have a radula |
| Class Gastropoda | Members of this class undergo a process called torsion |
| Hemocoel | The cavity within the body tissues is filled with circulatory fluid to bathe the tissues |
| adductor | These powerful muscles are used to open and closed valves |
| Class Cephalopoda | This class has the most advanced nervous system |
| hinge | this structure connects two valves |
| ganglia | An enlarged nerve ending that serves as a primitve brain |
| palps | these structures help to direct food into the mouth |
| Incurrent SIphon | Structure through which water, food, and oxygen enter the clam |
| Cilia | These beating structures help to draw water into the clam |
| excurrent siphon | structure through which water and wastes leave the clam |
| hemolymph | circulatory fluid found in the clam |
| chromotophores | color-changing pigment cells that provide camoflage to cephalopods |
| nacre | Inner layer of shell secreted continuously in thin layers by mantle; becomes thicker over life of mollusc |
| torsion | Shift in the position of visceral & mantle organs by 180° in development |
| spermatophore | Capsule or packet enclosing sperm; produced by males -Class Gastropoda |
| pen | A flattened, flexible internal support in a squid; remnant of ancestral shell -Class Cephalopoda |
