A) Echinoidea
B) Ophiuroidea
C) Holothuroidea
D) Asteroidea
Correct Answer: A
Solution :
Echinoidea Body of members of this class are discoid shaped, without arms, with compact skeleton or test, spines movable, pedicellariae, 3 jawed, masticating apparatus called Aristotles Lantern present, ambulacral grooves covered with ossicles, tube feet with suckers, larva echinopluteus, eg, sea urchin, sand dollar, heart urchin. Ophiuroidea Body star-shaped, arms sharply marked from central disc, anus absent, tube feet without suckers, madreporite oral, ambulacral grooves absent or covered by ossicles. Larva ophiopluteus, eg, brittle star. Holothuroidea Body elongated, arms, pedicellarae and spines absent, mouth anterior, surrounded by tentacles, ambulacral grooves concealed, respiratory tree present, tube feet with suckers, larva auricularia and dolio larva, eg, sea cucumber Asteroidea Body star shaped five or more arms not shaply marked from a central disc, tube feet with suckers in orally placed ambulacral grooves. Pedicellariae present anus and madreporite aboral, larva bipinnaria, eg, star fishes, sea stars.
You need to login to perform this action.
You will be redirected in
3 sec
