Mollusks
terms you need to know to understand mollusks
Terms
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- bivalve
- mollusk having two shells held together by hinges and strong muscles
- inhalant siphon
- tube through which a bivlave takes in water to filter out food and get oxygen
- mucus
- slimy substance created by some gastropods to aid in creeping on surfaces to protect the foot OR sticky substance on gills of a bivalve to capture food as it filters through the gills
- camouflage
- change of appearance to blend with surroundings to hide from predators
- oyster
- marine bivalve often farmed for its pearl-making ability
- squid
- cephalopod with an internal shell and a modified foot that forms 8 arms and 2 tentacles
- nacre
- also called mother of pearl; material that makes a pearl oyster's shell as well as forms the pearl
- cephalopod
- ocean dwelling mollusk whose foot is adapted to form arms & tentacles around the mouth
- gill hearts
- pump blood from the body back to the gills to get oxygenated
- broad foot
- organ that gastropods & bivlalves use for crawling, digging, or attaching to a surface
- bilateral symmetry
- two halves that are mirror images of each other
- nautilus
- cephalopod with an external shell and a modified foot that forms many arms
- arms
- modified foot of a cephalopod; covered with suckers on the underside; used to move, bring food to the mouth, or "taste" surrounding water
- beak
- hard, sharp, tooth-like structures used by cephalopods to crush and kill prey
- mantle
- thin layer of soft tissue that covers the internal organs and produces the shell
- larva
- immature form of an invertabrate animal that does not look like the adult
- jet propulsion
- the means by which squid & octopi propel themselves quickly through the water; movement of the body caused by the forced expulsion of water
- gastropod
- largest group of mollusks; having one or no shell; includes snails and slugs
- slug
- gastropod with no shell and broad foot
- cilia
- tiny projections on the gills that move muscus coated food from the gills to the palps
- shell
- hard covering of a mollusks that protects the internal organ
- pearl
- a smooth, rounded bead formed within the shells of certain mollusks in response to an irritant
- one way digestive tract
- digestive system in which food enters through one opening, passes through the body, and waste exits through another opening
- prey
- an animal hunted or seized for food
- anus
- orifice through which food waste exits the body
- mantle cavity
- space inside the mantle where the internal organs are located
- ligament
- part of a bivalve that opens the shells when the adductor muscle is relaxed
- adductor muscles
- muscles of a bivalve that keep the shell tightly closed
- gills
- organs that remove oxygen from water
- radula
- flexible ribbon of tiny teeth used to obtain food
- snail
- gastropod with one shell and a broad foot
- stomach
- organ that breaks down food with digestive juices
- octopus
- cephalopod with no shell and a modified foot that forms 8 arms and no tentacles
- ink sac
- organ in a cephalopod that produces ink ejected from the body to confuse and distract predators
- palps
- organ that moves mucus covered food from the cilia to the mouth
- tentacles
- modified foot of a cephalopod with suckers on the tips; used to grab food during hunting
- herbivore
- animal that only eats plants
- filter feeder
- organisms that feed by straining tiny organisms and plant matter out of the water
- pearl sac
- piece of mantle tissue that surrounds an irritant to form the center of a pearl
- mantle collar
- structure through which a cephalopod allows water to enter the mantle cavity in preparation for jet propulsion
- exhalant siphon
- tube through which a bivalve expels water from which it has removed food and oxygen
- liver
- organ that helps remove toxins from the blood
- intestine
- organ that completes digestion and absorbs nutrients from food
- heart
- organ that pumps blood
- carnivore
- animal that only eats other animals
- suckers
- structures on the underside of the arms of octopi & squid used for grabbing and pulling
- closed circulatory system
- system in which the blood is always contained in blood vessels
- invertebrates
- animal without a backbone
- predator
- organism that exists by preying on other organisms
- umbo
- oldest part of the shell of a bivalve from which the shell grows
- open circulatory system
- system in which the blood is not always contained in blood vessels
- omnivore
- animal that eats both plants and animals
- scavenger
- an organism that feeds on dead or decaying material