True segmentation ( metameric ) occurred for the first time in

True segmentation or metamerism means

True coelom appeared for the first time in

Metameric segmentation is the main feature of

Heteronomous segmentation , i.e. the division of labour resulting in dissimilarity of the metameres of the different regions of the body, is found in the phyla

Metameric segmentation is the characteristic of

Metameric segmentation is the characteristic of