Lecture 22

Question 1

Phylum Mollusca traits?

Answer 1

Calcium carbonate shell
Snails, clams squids and shit
muscular ventral foot for movement
Not segmented

Question 2

Mantle of Mollusca?

Answer 2

Thin layer of tissue that secretes shell

Question 3

visceral mass?

Answer 3

Contains mollusca organs, above its foot

Question 4

Radula?

Answer 4

strap-like rasping organ (mouthparts)

Question 5

Gills?

Answer 5

gas exchange and sometimes feeding

Question 6

___ circulatory system?

Answer 6

Open with blood not in vessels and a reduced coelom

Question 7

Trochophore?

Answer 7

planktonic larva

Question 8

Gatropoda class?

Answer 8

Snails
Glide along large foot
Torsion (anal opening over head)
Most are marine
Use lung for gas exchange (Mantle cavity)

Question 9

Nudibranch

Answer 9

Shell less gastropods

Eat cnidarians and use their nematocysts

Question 10

Class bivalvia?

Answer 10

Clams, oysters, mussels, scallops
Mostly marine
Feed by filtering through gills
Most dont move

Question 11

Class Cephalopoda?

Answer 11

Squid, cuttlefish, octopi 
No external shells
Long tentacles along mouth
Predatory (beak)
Maternal care
Do not have trochophore larvae.
good vision
intelligent

Question 12

Siphon? (cephalopoda)

Answer 12

jet propulsion

Question 13

Only type of mollusc with?

Answer 13

Closed circulatory system