Comparing Mollusks Chart KEY
Using what you
know about the three major classes of mollusks, complete the chart below by
checking the correct column or columns for each characteristic.
The chart below can be somewhat flexible, depending on the characteristic. For instance, external shells only applies to cephalopods if you consider the chambered nautilus. Venom could possibly be applied to gastropods, as nudibranchs are known for being toxic (and brightly colored)
Characteristic |
Type of Mollusk |
||
|
Gastropods |
Bivalves |
Cephalopods |
|
|
1. Intelligent, well developed nervous system |
X | ||
|
2. Has no distinct head |
X | ||
|
3. Has an open circulatory system |
X | X | |
|
4. External shells present in some species |
X | X | X |
|
5. Bite prey with beak |
X | ||
|
6. Uses gills for both respiration and food collection |
X | ||
|
7. All species are carnivorous predators |
X | ||
|
8. Uses a radula for feeding |
X | ||
|
9. Can change color for camoflauge |
X | ||
|
10. Can form pearls |
X | ||
|
11. Use a type of jet propulsion for movement |
X | X | |
|
12. Has bilateral symmetry |
X | X | |
|
13. Has a two part hinged shell |
X | ||
|
14. Is an invertebrate |
X | X | X |
|
15. Some species are venomous |
X | ||
OCTOPUS
CLAM
SLUG
SQUID
OYSTER
NAUTILUS
NUDIBRANCH
SCALLOP
CUTTLEFISH
LIMPET
CHITON
Types of Mollusks Wordsearch
