Axial sinus
Dermal papillae
Tube feet
Tiedamann bodies
Sea cucumber
Brittle star
Feather star
Both (b) and (c)
number of arms
structure of the ambulacral groove
tube feet
pedicellariae
herbivorous
omnivorous
carnivorous
none of these
Sea cucumber
Sea lily
Sea urchin
Sea star
Asteroidea
Crinoidea
Ophiuroidea
Holothuroidea
Sea-star
Star fish
Sea-cucumber
Sea lily
redia and cercaria
bipinnaria and brachiolaria
trochophore and aurecularia
none of these
ctenidia
dermal branchiae
book lungs
trachea
locomotion
respiration
feeding
all of these
(a) Starfish
(b) Brittle star
(c) Sea lily
(d) None of these
bipinnaria
glochidium
auralia
echinus
Sand dollar
Jelly fish
Silver fish
All of these
Snail
Slug
Nereis
Sea-urchin
torneria
onchosphere
trochophore
bipinnaria
digestive system
water vascular system
canal system
none of these
Schizocoelic coelom
Water vascular system
Spines in the body mass
Marine habitat
Antedon
Echinocardium
Ophiothrix
Pentaceros
Sea stars
Cake urchins
Sea lilies
Sea cucumbers
mouth apparatus
exoskeleton
skeletal system
bioluminscent organ
Starfish
Jellyfish
Cuttlefish
Fresh water mussel
tube feet
lobopodia
cephalopodia
rhizopodia
Asterias
Antedon
Echinus
Ophiothrix
sand dollar
sea cucumber
sea flies
sea horse
Sea star
sea urchin
Sea cucumber
Feather star
Crinoidea
Asteroidea
Holothuroidea
Ophiuroidea
sea-hares
sea-stars
devil fish
sea fans
an exoskeleton
a spiny skin
bilateral symmetry
gastrovascular cavity
Holothuria (sea cucumber)
Echinus (sea urchin)
Echittocardium (sand dollar)
Antedon (feather star)
coelenterates
polychaetes
echinodermates
hemichordates