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20 Cards in this Set
- Front
- Back
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What phylum do clams belong to? |
They belong to Mollusca |
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How many estimated species of Mollusks are there? |
There are 100,000 living species |
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Are mollusks lophotrochozoans? |
The Lophotrochozoa includes the segmented worms, molluscs, lophophorates and several smaller phyla. |
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What two main body groups do mollusks have? |
Head-foot and visceral mass |
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The shell in mollusks is secreted by what structure? |
The Mantle |
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What is the rasping structure in mollusks called? |
Radula |
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What class are snails and slugs in? |
They are in Gastropoda |
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What class are clams and mussels in? |
They are in Bivalvia |
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What are the muscles in clams responsible for closing the shell? |
The adductor muscles |
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What structure in clams is involved in gas exchange? |
In the mantle cavity functions as a lung for gas exchange. |
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What class to squids, octopuses and nautili belong to? |
The class Cephalopoda |
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What class of mollusks is the most complex? |
The class Cephalopoda |
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Which class of mollusks are the only ones with closed circulatory systems? |
Cephalopoda |
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What cells in cephalopods are pigmented? |
Chromatophores are pigment-containing and light-reflecting cells |
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Sperm-packets of cephalopods are called? |
spermatophore |
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Which tentacle delivers the sperm-packet? |
The Hectocotylus |
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What type of skeleton does Mollusks posess? |
Exoskeleton |
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What is the ink sac for? Pen? |
Ink sac is to keep it protected from predators. The ink sac squirts out ink that allow the squid to escape the threat. The pen is a shell, used to support squids' muscular tissues and organs. |
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How do squid locomote? |
Jet propulsion using muscles of mantle compressing water within mantle cavity and siphon |
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List all the classes from the PPT in the phylum Mollusks, give identifying characteristics of each class. Also give an example of an animal e.g. Chitons |
Class Gastropoda- Torsion/Head enters shell first, a Snail/Slug Class Bivalvia- -2 shells that are hinged together, Clams/Mussels/Oysters Class Cephalopoda- Jet propulsion, Squid/Octopus Class Polyplacophora- shell consisting of eight dorsal valves/ flattened foot, Chitons Class Scaphopoda- Tooth shells or tusk shells, Marine Class Monoplacophora- Undivided arched shell, Marine Class Solenogastres- Lack shellCrawl on ventral foot, Carnivores Class Caudofoveata- Deep sea, Wormlike, Lack shell, foot, and nephridia |
