Identify classes

Question 1

What class has arms extending from the central disc, tube feet with suckers, anus and madreporite aboral, pedicellariae present

Answer 1

Asteroidea

Question 2

What class is more or less globular or disc shaped, no arms, movable spines, tube feet with suckers, pedicellariae present

Answer 2

Echinoidea

Question 3

What class has no arms, spines absent; microscopic plates embedded in thick, muscular, body wall; anus present, tube feet with suckers, circumoral tentacles (modified tube feet), pedicellariae absent

Answer 3

Holothuroidea

Question 4

What class has arms sharply marked off from central disc; tube feet without suckers and not used for locomotion, anus & pedicellariae absent

Answer 4

Ophiuroidea

Question 5

What class has five arms branching at base, tentacle-like tube feet for food gathering; spine & pedicellariae absent

Answer 5

Crinoidea