Planarian is a member of the family Planariidae and is one of the flatworms present on the planet.
These planarian species have bilateral symmetry with a soft, leaf-shaped and ciliated body of 3 to 15 mm length and can grow up to 30 cm.
Its head is spade-shaped with two eyes which help him in running away from light and a brain made of ganglion cells. The mouth is present on the ventral (lower) side of the body towards the tail which is pointed.
Head and tail region of planaria show the difference as the head part contains eye-spots and is broad whereas tail part contains mouth near to it and is pointed.
Planarian<span>, </span><span>any of a group of widely distributed, mostly free-living flatworms of the class Turbellaria These are elongated and ciliated Mouth is middle of the body hope it helps</span>
