The epithelial lining of oral hood forms 6 to 8 pairs of finger -like folds each formed by a ciliated groove bounded by a ciliated ridge. Collectivelty these are called as wheel organs or muller's organs. In rotifers the cilia of wheel organ set up a vortex or whirling water current to sweep food organisms into mouth. The mid-dorsal groove is the largest which ends in a small depression on the roof of buccal cavity. These are called Hatschek's groove and Hatschek's pit. Both are ciliated ,glandular and secreate mucus while the pit is considered a sensory organs .
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