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Zoology Unit 4
Zoo Unit 4 Molluscs
| Question | Answer |
|---|---|
| mollusc | phylum of animals with a soft body, a muscular foot, and a mantle that may or may not produce a protective shell |
| foot | muscle that contracts in waves for movement or attachment to a surface |
| locomotion | movement |
| mantle | sheath of skin hanging down on each side of the body protecting the soft parts |
| open circulatory system | blood circulates through a heart and blood vessels but also empties into sinuses that does not separate it from other body fluids; found in gastropods and bivalves |
| radula | rasping, protrusible, tonguelike organ (not in bivalves) with varying numbers of teeth |
| head-foot | active area with feeding, sensory, and locomotor organs |
| head | most molluscs have this well developed region with a mouth and sense organs |
| visceral mass | contains internal organs for digestion, circulation, respiration, reproduction |
| mantle cavity | space between the mantle and the visceral mass, where reproductive cells and wastes are expelled |
| shell | protective structure secreted by the mantle that continually grows with molluscs that have it |
| gastropoda | class of mollusc including snails and slugs; means "stomach foot" |
| univalve | shell occuring in one piece |
| torsion | twisting of the body in early development that places the anus in an anterior position; occurs in gastropods |
| coiling | what happens to the shell of a gastropod that allows it to be more compact, but also asymmetrical |
| herbivore | organisms that eat plants |
| bivalvia | class of mollusc including mussels, clams, scallops, and oysters; means "two shells" |
| hinge ligament | holds the two shells of a bivalve together at the umbo |
| umbo | oldest part of the shell of a bivalve located where the two shells are held together |
| gills | breathing structures in aquatic molluscs |
| lungs | breathing structures in terrestrial molluscs such as land snails |
| siphon | bivalves have two (one for incurrent and one for excurrent) while cephalopods have one; used to move water through the mantle and/or for locomotion |
| cephalopoda | class of mollusc including squid, cuttlefish octopi, and nautilus; means "head foot" |
| arm | structure of some cephalopods with sensory suckers; molluscs have 8 of them |
| tentacles | additional feeding appendages found in squid and cuttlefish that are longer than arms and have suckers on the enlarged end or club |
| octopod | mollusc with 8 appendages |
| decapod | mollusc with 10 appendages (8 arms + 2 tentacles) |
| pen | small strip of shell within a squid's body for protection of internal organs and attachment of muscles |
| chromatophores | structure in most cephalopods which contain pigments; these expand and contract to produce color changes |
| ink sac | structure containing sepia within cephalopods |
| sepia | the dark pigment released by molluscs when alarmed or when confusing the enemy |
| jaws | beak-like structure of cephalopods for for biting or tearing flesh of prey |
| fin | two blade shaped structures on either side of a squid's body; helps with swimming |
| funnel | another name for the siphon of a squid or octopus |
| regeneration | ability for cephalopods and other animals to regrow lost parts |
| adductor | one of two muscles of a bivalve that contracts to close the two shells together |
| closed circulatory system | found in squid and octopus when the blood remains in vessels and does not mix with other body fluids outside the circulatory system |
| palps | structures in biv alves that help direct food to the mouth |
Created by:
Mrs. Meeks SHS
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