Question

What animals have nephridia?

Answer 1

Nephridia:

1. The excretory organs are not well developed in the lower organisms.
2. Nephridia are segmentally arranged excretory organs present in annelids like earthworms.
3. On the basis of their location, three types of nephridia are found in earthworms.
4. They are:
   1. Septal nephridia: These are present on both sides of the inter-segmental septa behind the 15th segment which opens into the intestines.
   2. Integumentary nephridia: These lie attached to the body wall from the third segment to the last segment, which opens on the body surface.
   3. Pharyngeal nephridia: These are present as three paired tufts in the fourth, fifth, and sixth segments.