Lecture 22 Flashcards
1
Q
Phylum Mollusca traits?
A
Calcium carbonate shell
Snails, clams squids and shit
muscular ventral foot for movement
Not segmented
2
Q
Mantle of Mollusca?
A
Thin layer of tissue that secretes shell
3
Q
visceral mass?
A
Contains mollusca organs, above its foot
4
Q
Radula?
A
strap-like rasping organ (mouthparts)
5
Q
Gills?
A
gas exchange and sometimes feeding
6
Q
___ circulatory system?
A
Open with blood not in vessels and a reduced coelom
7
Q
Trochophore?
A
planktonic larva
8
Q
Gatropoda class?
A
Snails Glide along large foot Torsion (anal opening over head) Most are marine Use lung for gas exchange (Mantle cavity)
9
Q
Nudibranch
A
Shell less gastropods
Eat cnidarians and use their nematocysts
10
Q
Class bivalvia?
A
Clams, oysters, mussels, scallops
Mostly marine
Feed by filtering through gills
Most dont move
11
Q
Class Cephalopoda?
A
Squid, cuttlefish, octopi No external shells Long tentacles along mouth Predatory (beak) Maternal care Do not have trochophore larvae. good vision intelligent
12
Q
Siphon? (cephalopoda)
A
jet propulsion
13
Q
Only type of mollusc with?
A
Closed circulatory system
