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19 Cards in this Set
- Front
- Back
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1. Chitons are found in which phylum and class?
2. give a few characteristics of chitons |
1. phylum mollusca, class polyplacophora
2. a. have valves on outer mantle b. large foot extends over ventral side of body c. move by pedal waves |
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What is torsion and what organism exhibits it?
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a. a counterclockwise 180 degree twisting of the head and foot relative to the shell, mantle, and the rest of the body
b. gastropods (snails) |
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Give several examples of organisms in the class Bivalvia
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1. clams
2. scallops 3. mussels 4. oysters |
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Characteristics of class Bivalvia (list 4-6)
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1. hinged shell that is closed with 1 or 2 adductor muscles
2. lateral compression of body and foot 3. lack of cephalization 4. spacious mantle cavity 5. sedentary lifestyle 6. absence of radula/odontophore complex |
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umbo
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bulge on dorsal surface of bivalve shells near hinge. made up of the earlies shell material deposited by the animal
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how does water move into and out of bivalves
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move into through an incurrent siphon then passes dorsally between gill filaments and exits through a excurrent siphon
located on posterior end of organism |
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polychaeta/clitellata
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excretory-nephridia
circulatory-dorsal/ventral blood vessel nervous- brain and ventral nerve cord anterior- prostomium setae- present larva- trochophore |
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nephridia
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kidney like structures found in segments of annelids
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the 3 layers of molluc shells
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periostracum
nacreous layer prismatic layer |
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mollusc shells primarily consist of what
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calcium carbonate in a protein matrix
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the mantle cavity of a mollusc contains the gills which are known as
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ctenidia
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gastropods move by
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action of cillia
pedal waves |
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examples of cephalopods are
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squids and chambered nautilus
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the nautilus moves by
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jet propulsion, expelling water from the mantle cavity through a flexible hollow siphon
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the shell of a squid is
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internal
thin, stiff, proteinaceous sheet, called the pen |
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cephalopod vision
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light is focused within the cephalopod eye by moving the lens toward or away from the retina
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all molluscs have a blood circulatory system
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in cephalopods the system is completely closed
in all other molluscs the system is largely open and blood moves through the hemocoel |
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setae
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all adult annelids possess at least one pair or chitinous bristles known as
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veriform
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worm shaped
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