Ambulacral grooves are absent in the living forms of the class

Question

Ambulacral grooves are absent in the living forms of the class (A) Crinoidea (B) Ophiuroidea (C) Asteroidea (D) Echinodermata

Tardigrade Admin · Accepted Answer

Ambulacral grooves are found in the arms of Echinoderms lined by tube feet. It is absent in Ophiuroidea which are covered by ossicles.

Q. Ambulacral grooves are absent in the living forms of the class