Porifera
Common name for organisms in this phylum
sponge
Comon name for this phylum
sea star
3 major classes of molluscs
gastropods
bivalvia
cephalopda
3 major classes
merostomata (horseshoe crab)
pycnogonida (sea spiders)
crustacea (shrimp, crabs, lobsters)
cephalopda
Type of symmetry
Asymmetrical
how does water move throughout the body for movement
water vascular system
type of symmetry for all molluscs
bilateral
2 unique characteristics to this phylum
jointed appendages & exoskeleton
jet propulsion
how cephalopodas swim
What is the term that means they are attached to one spot and don't move
sessile
what is an internal calcium plates
endoskeleton
soft outer layer of tissue that produces productive shell
mantle
what crustaceans shed when molting
carapace aka shell
evolutionary trend of nerves/brains to move towards front of organism
cephalization
how do sponges eat?
filter feeding
what does term echinoderm mean?
spiny skin
how do most bivalves eat
filter feeding, siphon to filter
Used for feeding and protection in crustaceans
chelipeds
Name 4 mollusks humans eat
shrimp, crab, squid, octopus, escargot, clams, scallops, oyster
Part of a sponge that is hard and gives it structure
spicules
A sea cucumber expelling organs or a sea star detaching a ray is an example of
evisceration
term that means their body/organs twist as shell develops
torsion
Used for swimming
the class that makes up 75% of mollusks
gastropoda