number of mollusc tissue layers
class with two shells
number of bivalve siphons
purpose of bivalve siphons
filter feeding and breathing
How is the bivalve foot compressed?
Purpose of bivalve foot for sedentary bivalves?
Bivalve species that is not sedentary
Bivalve species that is sessile
Do bivalves have a radula?
Bivalves do not have a radula
Why do bivalves have large gills?
Bivalves have large gills for breathing and straining food
How do bivalves reproduce?
External fertilization (bivalves)
Gastropoda (number of species)
Gastropod sense organs
marine, aquatic, terrestrial
rough tongue like thing used for scraping algae to eat
Shape of gastropod shell
Problems with being a gastropod
anus is near gills (keyhole limpets and abalone avoid this problem by having another hold in their shell)
marine snails, dioecious
nudibranchs and sea hares, simultaneous hermaphrodites
Aeolids (a kind of opisthobranchia)
nudibranchs that put nematocysts in the cerata on their backs
land and fresh water snails, simultaneous hermaphrodites
chitons (chi rhymes with lye)
where do chiton live
chitons have them, used to clamp
Do chitons have radula?
Yes (Chitons have radula)
dioecious, external fertilization
octopus, squid, cuttlefish, (nautilus)
mouth, injects neurotoxins into prey
Why does a nautilus have a chambered shell?
to regulate bouyancy
How long can a nautilus live for?
twenty to thirty years
Cuttlefish internal shell
cuttlebone (not a shell)
squid internal shell
pen (not a shell)
octopus internal shell
does not exist
Siphon cephalopod purpose
4 types of camouflage cells
iridophores, chromatophores, leucophores, photophores
What is a pseudomorph?
If the shape of a cephalopod's ink looked like a cephalopod, the ink shape would be called a pseudomorph (but it doesn't. dream on)
How long can squids live?
one to three years
dioecious-male deposits spermatophores in female
do cephalopods have a larval stage?
No. Direct development
Giant squid genus?