Question

Write a detail note on external apertures of leech.

Answer 1

(i) Mouth:
It is located in the middle of anterior sucker.
(ii) Anus: Anus is a small aperture that opens on the mid-dorsal side of 26th segment.
(iii) Nephridiopores: Nephridia open to the exterior by 17 pairs of nephridiopores. They lie ventrally on the last annulus of each segment from 6 to 22.
(iv) Male genital pore: It is a mid-ventral opening, situated between second and third annuli of 10th segment.
(v) Female genital pore: It lies mid-ventrally between second and third annuli of 11th segment.