Crinoidea
Asteroidea
Holothuroidea
Ophiuroidea
C. Holothuroidea
Sea cucumber
Brittle star
Feather star
Both (b) and (c)
sea-hares
sea-stars
devil fish
sea fans
bipinnaria
glochidium
auralia
echinus
A fresh water echinoderm
An ancient Greak ship lantern shaped structure connected with balancing system of seal lily
A masticatory apparatus connected with digestive system in sea urchin
A seive plate connected with ambulacral system in sea star
movable
immovable
prehensile
all of these
Sea star
sea urchin
Sea cucumber
Feather star
Asteroidea
Crinoidea
Ophiuroidea
Holothuroidea
(a) Starfish
(b) Brittle star
(c) Sea lily
(d) None of these
redia and cercaria
bipinnaria and brachiolaria
trochophore and aurecularia
none of these
Sea stars
Cake urchins
Sea lilies
Sea cucumbers
Antedon
Echinocardium
Ophiothrix
Pentaceros
sand dollar
sea cucumber
sea flies
sea horse
locomotion
respiration
feeding
all of these
spines
tube feet
integumentary structures
none of these
Crinoidea
Asteroidea
Holothuroidea
Ophiuroidea
Nervous system with a large brain
Respiratory system
System of internal seleton
Excretory system
Snail
Slug
Nereis
Sea-urchin
pluteus
echinopluteus
bipinnaria
auricularia
digestive system
water vascular system
canal system
none of these
herbivorous
omnivorous
carnivorous
none of these
tube feet
lobopodia
cephalopodia
rhizopodia
Holothuria (sea cucumber)
Echinus (sea urchin)
Echittocardium (sand dollar)
Antedon (feather star)
ctenidia
dermal branchiae
book lungs
trachea
Starfish
Jellyfish
Cuttlefish
Fresh water mussel
number of arms
structure of the ambulacral groove
tube feet
pedicellariae
parapodia
pseudopodia
setae
tube feet
coelenterates
marine arthropods
echinodermates
sponges
Sea cucumber
Sea lily
Sea urchin
Sea star
Sand dollar
Jelly fish
Silver fish
All of these
Axial sinus
Dermal papillae
Tube feet
Tiedamann bodies