Zoology week 6

Question 1

Mollusca

Answer 1

Phylum in Lophotrochozoa: body of 2 parts (head-foot and visceral mass), Mantle that secrete calcium carbonate shell and mantle cavity, reduced coelom, open circulatory system (except in Cephalopods), radula mouthpart

Question 2

Gastropoda

Answer 2

largest Mollusc class: includes snails, slugs and limpets. have torsion, shell coiling, feed with radula, locomotive using head-foot

Question 3

Bivalvia

Answer 3

Second largest Mollusc class: clams, oysters, muscles and scallops
sheet-like mantel
shell consisting of 2 laterally compressed valves

Question 4

Cephalopoda

Answer 4

Mollusc class: Octopuses, squid, cuttlefish and nautiluses
most complex molluscs, anterior part of foot modified into tentacles or arms, head in line with visceral mass, mantle encloses the body (except for the tentacles)