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Mollusks
Phylum-Molluska
| Question | Answer |
|---|---|
| What does "molluska" mean? | "soft body" |
| Appx. how many species are there of mollusks? | 47,000 |
| Mollusks' habitat? | aquatic (mostly marine) and terrestrial |
| name some characteristics of mollusks: | -gills-used to carry out respiration-size: <1in to 66ft.-reproduce sexually-shells fossolize after filling up with sediments-used for utiencels/money |
| Describe the class Gastropoda: | univalves (one-shell); (slug,snail)--terrestrial but also live in water-PELECYBODA-bivalves-two shells (clam, mussel, scallop)--all aquatic-CEPHALOPODA-head-footed (octopus/squid)-most intelligent and all marine with radula. |
| Describe the three distinct regions of the mollusk: | -Head-footed region:where animal has the mough or any other sense organ and the foot(also with radula)--Visceral Mass Region-where you will find any of the reproductive... organs.-Mantle:surrond viseral mass and produces shell. |
| Describe the habitat, size, predators, and reproductive habits of the clam: | -clams are bivalves and can range from <1in. to 4ft. in legnth-starfish-primary predator-habitat: aquatic -bisexual; reproduce sexually; and interiourly |
| Describe the outer and somewhat internal structure of the clam: | --shells held together by hinged ligaments--shell opens on ventral side to allow the foot to move in and out--2 openings on posotrour end allow water to move in and out. (incurrent/excurrent)*(gills found under mantle) |
| Describe the three shell layers of the clam: | -tough outer layer-middle Prismatic Layer: made of calcium carbonate and colorful-Pearly layer--invisible |
| How does the foot help the clam move? | Acts as an anchor so three muscles in the foot can contract and manipulate movement=> slow |
| Describe the nervous system of the clam: | -no brain-has sensory sells that respond to light, touch... |
| Describe the circulatory process | oxygen through ixcurrent pore through gills that extract O2=>"hearts"/lt/rt atria=>body cavity=> oxygen is absorbed by blood cells=> blood is collected in sinuses=>flows through gills and back to heart. (open circulatory system) |
| Describe the digestion process of a clam | -cilia on mouth sweep food in throug gills=>esophagus=>stomach=>intestine=>undigested food and waste pass out anus and into mantle cavity=>excurrent siphen. |
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