mollusca (clams, snails, chitins) Flashcards
1
Q
symmetry
A
bilateral
2
Q
segmentation
A
lacks segmentation
3
Q
type of body cavity
A
coelomate
4
Q
body plan
A
-fleshy epithelium
-lined by mantle
-secrete a shell
-muscular ventral foot
-dorsal visceral body mass
-head developed in gastropods (snails) and cephalopods (squid)
5
Q
complete digestive tract
A
-large digestive gland
-salivary gland
6
Q
open circulatory system
A
-dorsal heart
-ostia opening
7
Q
respiration by…?
A
gills
8
Q
4 classes
A
Cephalopoda
Gastropoda
Amphineura
Pelecypoda
9
Q
Cephalopoda (squid + octopi)
A
-thin or absent shell
- tentacle sucks
10
Q
Gastropoda
A
-long ventral foot
- viscera (in shell)
11
Q
Amphineura (chitons)
A
- 8 overlapping scales
12
Q
Pelecypoda (bivalves)
A
-bodies enclosed by two valves
