Phylum Mollusca Flashcards
1
Q
what are the 4 classes within Mollusca?
A
1) gastropoda
2) polyplacophora
3) bivalvia
4) Cephalopoda
2
Q
what are the gastropods?
A
snails, slugs, limpets
3
Q
describe a common feature of gastropods
A
large muscular foot
4
Q
how many tentacles do gastropods have?
A
one or two pairs
5
Q
what is different about sea slugs?
A
they have no shell and external structures are used for gas exchange
6
Q
describe polyplacopohora (chitons)
A
- segmented
- backs are protected by calcareous plates
7
Q
what are in the class bivalvia?
A
clams, mussels and scallops
8
Q
what defines the bivalves?
A
shell has two parts hinged by a ligament along the back
9
Q
what are in the class Cephalopoda?
A
squid, cuttlefish and octopus
10
Q
describe cephalopods
A
- large heads
- mouth surrounded by tentacles
- sometimes have suckers
