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Three classes of mollusks.
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What does bivalvia mean?
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AS Mollusca
Mollusks
| Question | Answer |
|---|---|
| Three classes of mollusks. | Bivalvia, Gastropoda, Cephalopoda |
| What does bivalvia mean? | "Two shells" |
| What does gastropoda mean? | "Stomach foot" |
| What does cephalopoda mean? | "Head foot" |
| All mollusks have these three body parts. | muscular foot, visceral mass, mantle |
| Part of a mollusk that secretes the shell. | mantle |
| Part of a mollusk that contains the internal organs. | visceral mass |
| Example bivalves. | clams, oysters, scallops, mussels |
| Example gastropods. | snails, slugs, nudibranchs (sea slugs) |
| Example cephalopods. | squid, octopus, nautilus, cuttlefish |
| Mollusks have a true coelom and are therefore considered | coelomates |
| Type of digestive system that contains a mouth AND an anus. | complete digestive system |
| Kidney-like organs used to excrete wastes. | nephridia |
| All mollusks have this type of symmetry. | bilateral |
| Tongue-like organ with rows of teeth used for scraping, drilling, and breaking down food. (only found in gastropods and cephalopods). | radula |
| Class of mollusks that use siphons to filter feed. | bivalvia |
| Part of a bivalve used to dig or burrow into the sand. | foot |
| Strong muscles used to keep a bivalve's shells closed. | adductor muscles |
| Bivalves and gastropods have blood that doesn't travel in vessels throughout the entire body. | open circulatory system |
| Cephalopods have blood that travels in vessels throughout the entire body. | closed circulatory system |
| A harpoon-like projection found in some snails. | proboscis |
| 180 degree twisting of a gastropods visceral mass and mantle. | torsion |
| Example gastropod with venomous spines. | nudibranchs (sea slugs) |
| A cephalopod's foot has been modified into different __________ contain suction cups. | arms/tentacles |
| Most cephalopods have a parrot-like ___________ for biting their prey. | beak |
| A tube-like organ on a cephalopod uses to take in and expel water. Can also be used for jet propulsion. | siphon |
| Cephalopod's sperm sac. | spermatophore |
| Class of mollusks considered to be the most intelligent of all invertebrates. | Cephalopoda |
| Cells that contains pigments that change color based on a cephalopod's environment. | chromatophore |
| Flaps on the mantle that help some cephalopods with swimming. | fins |
| Structures found on the clubs of a squid's feeding tentacles used to capture and hold on to prey. | toothed suckers |
| Sensory structures located at the anterior end of a gastropod. | tentacles (some contain eyespots for seeing) |
| Small pore in a gastropods side used for breathing. | respiratory pore |
| Oldest part of a bivalve's shell; where the two shells meet. | umbo |
| Parts of a bivalve that bring in water (and thus food and oxygen) AND excrete waste (including CO2). | incurrent and excurrent siphon. |
| As a bivalve grows, new parts of the growing shell are laid down in _________________, with the older ones closest to the umbo. | rings |
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