Date post: | 03-Jan-2016 |
Category: |
Documents |
Upload: | darren-bennett |
View: | 218 times |
Download: | 0 times |
I. Intro to MollusksA. Mollusk soft bodied
B. 2nd largest phyla
1. small large
2. fast movers slow movers
3. intelligent non-intelligent
4. Deep seas mountain tops
C. Ex: squid, clam, oyster, octopus, snail, slugs, etc.
D. Used as a food source
1. clams, oysters, etc.
E. Used for jewelry (pearls)
F. All have a “foot” specialized muscular organ
II. Cephalopods
A. Facts
1. Cephalo = head / poda = foot
2. Includes…squid, octopus, nautilus
3. Active predators
4. shell nautilus
5. no shell octopus + squid
1. Locomotion-”foot” acts as a siphon pushes water out-gas filled chambers
2. Nervous System-intelligent-chemoreceptor cell used to camouflage
3. Others-60 to 90 tentacles (no suckers)-sexual reproduction-radula tongue like structure
i. 250,000 teeth ii. Conveyor belt
1. Locomotion-same as nautilus
2. Nervous System-exceptional eyes-chemoreceptor cell
3. Others-sepia ink sac; helps hide
from enemies-8 arms / 2 tentacles-pen acts as backbone of
squid-beak – used to break up food
1. Locomotion – same as squid2. Nervous System
-great eye sight-extremely intelligent (can be conditioned)-chemoreceptor cells
3. Others-sepia -pen-8 arms – all with suction cups-beak – used to break up food
III. GastropodsA. Facts
1. gaster = stomach / poda = foot2. Largest group of mollusks (50,000)3. Ex: snails and slugs4. Dioecious (individual sexes) or
monoecious (both sexes)5. can be terrestrial (gills or lungs)6. Sluggish or slow moving7. Usually feed on algae or plankton8. Occupy a shell for protection
B. Conus
1. active predator
2. uses worm-like tongue to lure in prey
-fish bites…proboscis fires…injects venom…paralyzes fish
3. lethal sting to humans
IV. Class Pelecypoda (Bivalves)
A. Facts
1. pelecy = hatchet / poda = foot
2. Ex: mussels, clams, scallops, oysters
3. Filter Feeders
4. no radula
5. Dioecious
B. The Clam
1. External Anatomy
a. Umbo – oldest part of the shell
b. Hinge Ligament – keeps the 2 shells connected
c. Growth Rings
2. Internal Anatomy
a. Siphons
-incurrent takes water + food into clam
-excurrent removes waste
b. Mantle – tissue that covers the organs of the clam
-similar to skin
c. Palp – guide food into the mouth
d. Heart
-3 chambered
-beats slow (0.2 – 30 times/min.)