Members of which phylum are known as “segmented worm” Write about their body symmetry, mode of excretion & respiration.
Members of the phylum Annelida are also referred to as segmented worms. Their body is metamerically segmented. Example: - Nereis, Pheretima and Hirudinaria. (i) Body Symmetry: - Segmented worms have typical metameric segmentation. Their body consists of segments called metamere or somites and ring-like grooves called annuli. (ii) Excretion: - The excretory unit is coiled tubules called nephridia. (iii) Respiration: - Respiration occurs by means of gills or skin. The skin is supplied with a large number of blood vessels. It is permeable and plays an important role in the exchange of gases.
