Holothuria (sea cucumber)
Echinus (sea urchin)
Echittocardium (sand dollar)
Antedon (feather star)
D. Antedon (feather star)
number of arms
structure of the ambulacral groove
tube feet
pedicellariae
sand dollar
sea cucumber
sea flies
sea horse
Starfish
Jellyfish
Cuttlefish
Fresh water mussel
Sea cucumber
Sea lily
Sea urchin
Sea star
Sea star
sea urchin
Sea cucumber
Feather star
Star fish
Sea fan
Ship worm
None of these
Sea stars
Cake urchins
Sea lilies
Sea cucumbers
sea-hares
sea-stars
devil fish
sea fans
parapodia
pseudopodia
setae
tube feet
Nervous system with a large brain
Respiratory system
System of internal seleton
Excretory system
digestive system
water vascular system
canal system
none of these
bipinnaria
glochidium
auralia
echinus
coelenterates
polychaetes
echinodermates
hemichordates
coelenterates
marine arthropods
echinodermates
sponges
herbivorous
omnivorous
carnivorous
none of these
movable
immovable
prehensile
all of these
Sand dollar
Jelly fish
Silver fish
All of these
echinodea
holothuroidea
asteroidea
ophiuroidea
excretion
absorption
reproduction
respiration
Sea hares
Brittle stars
Star fishes
Sea fish
Ophiothrix
Pentaceros
Antedon
None of these
synapta and antedon
astrias and asterina
ophiothrix and ophioderma
all of these
Asterias
Antedon
Echinus
Ophiothrix
spines
tube feet
integumentary structures
none of these
locomotion
respiration
feeding
all of these
Sea cucumber
Brittle star
Feather star
Both (b) and (c)
Snail
Slug
Nereis
Sea-urchin
Holothuria (sea cucumber)
Echinus (sea urchin)
Echittocardium (sand dollar)
Antedon (feather star)
Asteroidea
Crinoidea
Ophiuroidea
Holothuroidea
Antedon
Echinocardium
Ophiothrix
Pentaceros