Mollusca Flashcards
1
Q
What are the classes of mollusca?
A
Polyplacophora - chitons
Gastropoda - snails, slugs
Bivalvia- mussels, cockles, clams
Cephalopoda- octopus , squid , nautilus
2
Q
What are molluscs?
A
Soft 100,000 species Mantle secretes shell Ctenidia in mantle cavity RADULA for feeding Foot is for locomotion Heart, digestive, excretory and reproductive organs in visceral mass
3
Q
Why is the body plan of a mollusc special?
A
Basic body plan with FOOT, MANTLE AND VISCERAL MASS
4
Q
GENERA TO REMEMBER
A
Lephidochiton, helix, patella, arion, mytillus, pecten, octopus, sepia.
5
Q
What are polyplacophora?
A
Many shells
8 overlapping segmented shells
Herbivores, scrape algae off rocks with radula
Attached to rock by foot
6
Q
What are gastropoda?
A
Stomach foot
Torsion of visceral mass by 180 degrees
Some can swim or gallop
Terrestrial members - VASCULARISED LUNG
7
Q
What are bivalvia?
A
Two shells Hinged No radula Use ctenidia to extract fod from water Bring water through siphon expelling through another
8
Q
Cephalopoda
A
Head foot Mantle cavity and siphons arranged for jet propulsion Active predatorss Eyes highly developed Courship and learninh Die after breeding VERY ADVANCED FOR INVERTEBRATES
