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echinodermata
phylum of sea stars, sea urchins, sea cucumbers, etc
crinoidea
feather stars/sea lily
asteroidea
starfish
ophiuroidea
brittle stars
holothuroidea
sea cucumbers
echinoidea
sea/heart urchins, sand dollars
hemichordata
phylum of acorn worms
chordata
phylum of bilaterian, deuterostome organisms with the 5 distinct synapomorphies
urochordata
tunicates
ascidiacea
sea squirts
cephalochordata
lancelets
periostomial membrane
surrounds mouth
dermal branchiae
projections of coelom that serve in respiration and excretion
pedicellaria
small projections with valves used in defense and prevent fouling
pedicellaria
madreporite
allows water to enter vascular system
ambulacral grooves
where podia lie
podia
with suckers = locomotion, without suckers = particle capture
aboral
madreporite
A
pedicellaria
B
bipinnaria larva
C
oral
periostomial membrane
A
mouth
B
podia
C
ambulacral groove
D/E
ampulla
A
podia
B
coelom
C
spines
D
ossicles
E
dermal branchia
F
ossicles
A
dermal branchia
B
spines
C
pyloric cecae
A
gonad
B
cardiac stomach
C
pyloric stomach
D
intestinal cecum
E
stone canal
F
madreporite
G
madreporite
A
stone canal
B
polian vesicles
C
ampulla
D
water vascular system
fluid supply and control of podia
stone canal
connects madreporite to WVS
ring canal
moves fluid from stone canal to 5 branches of WVS
polian vesicles
maintain fluid volume of WVS
radial canals
moves fluid from ring canal to each ambulacral groove
lateral canals
moves fluid from radial canal to individual podia
ampullae
“squeeze” bulb that contracts to extend podia
ossicles
skeletal support, protection/defense
tentacles
suspension/surface deposit feeding in sea cucumbers
tentacles
A
mouth
B
ring canal
C
stomach
D
gonoduct
E
respiratory tree
F
cloaca
G
gonad
H
intestine
I
polian vesicle
J
pharynx
K
crinoidea
cirri
A
arm
B
pinnules
C
pinnules
suspension feeding
echinodermata, ophiuroidea
phylum, class?
echinodermata, echinoidea
pluteus larva
A
dorsal valve
A
ventral valve
B
lophophore
C
brachiopoda
chordata, cephalochordata
chordata, urochordata, ascidiacea
branchial basket
C
tadpole larva
D
hemichordata
collar
A
proboscis
B
aristotles lantern
feeding in sea urchins
echinopluteus larva
bipinnaria larva