Antedon
Echinocardium
Ophiothrix
Pentaceros
A. Antedon
Crinoidea
Asteroidea
Holothuroidea
Ophiuroidea
parapodia
pseudopodia
setae
tube feet
Snail
Slug
Nereis
Sea-urchin
sea-hares
sea-stars
devil fish
sea fans
movable
immovable
prehensile
all of these
sand dollar
sea cucumber
sea flies
sea horse
Crinoidea
Asteroidea
Holothuroidea
Ophiuroidea
Sea cucumber
Sea lily
Sea urchin
Sea star
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
locomotion
respiration
feeding
all of these
redia and cercaria
bipinnaria and brachiolaria
trochophore and aurecularia
none of these
Star fish
Sea fan
Ship worm
None of these
haemal system
digestive system
ambulacral system
reproductive system
mouth apparatus
exoskeleton
skeletal system
bioluminscent organ
coelenterates
polychaetes
echinodermates
hemichordates
pluteus
echinopluteus
bipinnaria
auricularia
number of arms
structure of the ambulacral groove
tube feet
pedicellariae
digestive system
water vascular system
canal system
none of these
torneria
onchosphere
trochophore
bipinnaria
Sea-star
Star fish
Sea-cucumber
Sea lily
Nervous system with a large brain
Respiratory system
System of internal seleton
Excretory system
tube feet
lobopodia
cephalopodia
rhizopodia
Asterias
Antedon
Echinus
Ophiothrix
Sea star
sea urchin
Sea cucumber
Feather star
Asteroidea
Crinoidea
Ophiuroidea
Holothuroidea
Antedon
Echinocardium
Ophiothrix
Pentaceros
an exoskeleton
a spiny skin
bilateral symmetry
gastrovascular cavity
Sea cucumber
Brittle star
Feather star
Both (b) and (c)
echinodea
holothuroidea
asteroidea
ophiuroidea
Sea stars
Cake urchins
Sea lilies
Sea cucumbers