Question

In phylum echinodermata, the classes having pedicellariae are

• A. Crinoidea and holothuroidea
• B. Holothuroidea and echinoidea
• C. Asteroidea and echinoidea
• D. Ophiuroidea and holothuroidea

Answer 1

Answer: (C)

Asteroidea and echinoidea

A) Members of Crinoidea lack spines, pedicellariae and madreporite while members of Holothuroidea lack spines, pedicellariae and ambulacral grooves.

B) Members of Holothuroidea lack spines, pedicellariae and ambulacral grooves while members of Echinoidea lack arms and ambulacral grooves. They have pedicellariae.

C) Members Echinoidea and Asteroidea have pedicellariae.

D) Members of Holothuroidea lack spines, pedicellariae and ambulacral grooves while members of Ophiuroidea lack ambulacral grooves and pedicellariae.

So the correct answer is 'Asteroidea and Echinoidea'.