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Marine Biology Module #5

Terms

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exoskeleton
a jointed suit of armor that covers the organisms abdomens, appendages, and mouth parts
Class Scaphopoda
contains tusk shells
carapace
an armored shield that covers the anterior portion of crustaceans
Class Gastropoda
contains abalones, helmet shells, and nudibranches
Phylum Mollusca
contains organisms called mollusks
chitin
a tough, but flexible substance
hermaphroditic
both sexes can produce both male and female gametes
Class Crustacea
contains shrimp, crabs, and lobster
open circulatory system
a circulatory system in which blood flows out of the blood vessels and into body cavities, where it comes in direct contact with the cells
operculum
a horny plate the forms a lid over the opening of the shell when the head and foot are pulled inside
chitin
a derivative of carbohydrates that provides both flexibility and support
Class Bivalvia
contains clams, mussels, and scallops
radula
an organ covered with hundreds of small teeth, used for scraping food into the mouths of mollusks
Phylum Arthropoda
contains shrimp, lobsters, barnacles, and crabs, and means joint-foot
pearls
these are formed when an irritant is trapped inside a oyster and the oyster secretes calcium carbonate covering it layer after layer until this is made
closed circulatory system
a circulatory system in which the blood always remains in vessles
chromatophores
these have the ability to rapidly change the animal's color to match their surroundings
Class Cephalopoda
contains squid, octopus, and cuttlefish
gills
used for exchanging gases with the surrounding water
mantle
a sheath of tissue surrounding the organ of a mollusk, producing the mollusk's shell and performing respiration
molting
the process of shedding an exoskeleton and replacing it with a new one
cephalothorax
the anterior part of an arthropod body, consisting of a head and other body segments fused together
Class Polypacophora
contains chitins
foot
used for locomotion, anchoring, or obtaining food

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