sea-hares
sea-stars
devil fish
sea fans
C. devil fish
tube feet
lobopodia
cephalopodia
rhizopodia
locomotion
respiration
feeding
all of these
digestive system
water vascular system
canal system
none of these
parapodia
pseudopodia
setae
tube feet
Snail
Slug
Nereis
Sea-urchin
Crinoidea
Asteroidea
Holothuroidea
Ophiuroidea
Holothuria (sea cucumber)
Echinus (sea urchin)
Echittocardium (sand dollar)
Antedon (feather star)
haemal system
digestive system
ambulacral system
reproductive system
Sea cucumber
Brittle star
Feather star
Both (b) and (c)
Sand dollar
Jelly fish
Silver fish
All of these
number of arms
structure of the ambulacral groove
tube feet
pedicellariae
coelenterates
marine arthropods
echinodermates
sponges
Sea cucumber
Sea lily
Sea urchin
Sea star
Schizocoelic coelom
Water vascular system
Spines in the body mass
Marine habitat
Nervous system with a large brain
Respiratory system
System of internal seleton
Excretory system
sea-hares
sea-stars
devil fish
sea fans
movable
immovable
prehensile
all of these
ctenidia
dermal branchiae
book lungs
trachea
Asterias
Antedon
Echinus
Ophiothrix
Sea-star
Star fish
Sea-cucumber
Sea lily
Axial sinus
Dermal papillae
Tube feet
Tiedamann bodies
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
an exoskeleton
a spiny skin
bilateral symmetry
gastrovascular cavity
spines
tube feet
integumentary structures
none of these
coelenterates
polychaetes
echinodermates
hemichordates
pluteus
echinopluteus
bipinnaria
auricularia
Starfish
Jellyfish
Cuttlefish
Fresh water mussel
Sea stars
Cake urchins
Sea lilies
Sea cucumbers
excretion
absorption
reproduction
respiration
Crinoidea
Asteroidea
Holothuroidea
Ophiuroidea