Sea cucumber
Brittle star
Feather star
Both (b) and (c)
B. Brittle star
sea-hares
sea-stars
devil fish
sea fans
Snail
Slug
Nereis
Sea-urchin
Sea star
sea urchin
Sea cucumber
Feather star
locomotion
respiration
feeding
all of these
Sea stars
Cake urchins
Sea lilies
Sea cucumbers
tube feet
lobopodia
cephalopodia
rhizopodia
an exoskeleton
a spiny skin
bilateral symmetry
gastrovascular cavity
synapta and antedon
astrias and asterina
ophiothrix and ophioderma
all of these
number of arms
structure of the ambulacral groove
tube feet
pedicellariae
excretion
absorption
reproduction
respiration
pluteus
echinopluteus
bipinnaria
auricularia
Holothuria (sea cucumber)
Echinus (sea urchin)
Echittocardium (sand dollar)
Antedon (feather star)
herbivorous
omnivorous
carnivorous
none of these
redia and cercaria
bipinnaria and brachiolaria
trochophore and aurecularia
none of these
coelenterates
polychaetes
echinodermates
hemichordates
Antedon
Echinocardium
Ophiothrix
Pentaceros
Crinoidea
Asteroidea
Holothuroidea
Ophiuroidea
Sea cucumber
Brittle star
Feather star
Both (b) and (c)
torneria
onchosphere
trochophore
bipinnaria
spines
tube feet
integumentary structures
none of these
coelenterates
marine arthropods
echinodermates
sponges
parapodia
pseudopodia
setae
tube feet
Starfish
Jellyfish
Cuttlefish
Fresh water mussel
Crinoidea
Asteroidea
Holothuroidea
Ophiuroidea
Ophiothrix
Pentaceros
Antedon
None of these
bipinnaria
glochidium
auralia
echinus
Axial sinus
Dermal papillae
Tube feet
Tiedamann bodies
Asterias
Antedon
Echinus
Ophiothrix
Asteroidea
Crinoidea
Ophiuroidea
Holothuroidea
(a) Starfish
(b) Brittle star
(c) Sea lily
(d) None of these