Mollusks Flashcards
What does Mollusca mean?
soft-bodied
How many germ layers to mollusks have?
3
What is the body symmetry of mollusks?
bilateral
What is the segmentation of mollusks?
there is none
What is the coelem of mollusks?
true coelem
Describe the nervous system in mollusks
some simple; some complex
Describe the skeleton of mollusks
some hydrostatic; some exoskeleton
What is the visceral mass?
organs
What is the mantle?
thin membrane surrounding organs
Describe excretion in mollusks
tube-shaped nephridia
Describe respiration in mollusks
aquatic-gills; land-moist mantle
Are mollusks sexual or asexual?
sexual
What does Gastropoda mean?
stomach foot
What does Bivalvia mean?
two shells
What does Cephlaopda mean?
head foot
What is the radula in gastropoda?
tongue-like organ
What type of circulatory system do gastropoda have?
open
Describe the nervous system of gastropoda
small brain
How to gastropoda respire
aquatic-gills; land-primitive lung, or diffusion through skin
How do bivalvia digest food?
filter feeders
Describe the respiration in bivalvia
filter oxygen from the water using gills
Describe the circulation in bivalvia
open
Describe the reproduction in bivalvia
sexual. they are hemaphrodites
Describe digestion in cephalopods
they use radula and sharp-beak like jaws and tentacles with suckers
How do cephalopods respire?
gills
Describe the circulation in cephalopods
closed
Describe the reproduction in cephalopods
sexual; they have separate sexes; internal fertilization; eggs put outside body
Describe the nervous system of cephalopods
large brain, good eyesight, tentacles sensitive to touch
How do cephalopods move?
jet propulsion
Describe locomotion on bivalvia
mostly remain in one place.
clams use foot
mussels use sticky thread
scallops flap shells
