2. Body consists of 100 to 120 ring-like segments depicting true metamerism and measuring approximately 150 mm.
3. Both external and internal segmentations are distinct. The worm is glistening deep brown or clay-coloured.
4. Anterior end is somewhat narrowly pointed, while posterior end is bluntly pointed.
5. Except the first and last segment, each segment contains a row of setae in the ventral body wall.
6. Dorsal surface is dark brown in colour and it is easily recognized by dark medium line of the dorsal blood vessel.
7. First segment is called as prostomium which contains ventral mouth. The last segments is called as clitellum around 14 to 16 segments.
8. A portion of the body is thickened and is called as clitellum around 14 to 16 segments.
9. The female-genital pore on the 14th segment and male-genital pores on the 18th segment. Two pairs of genital papillae lie on the 14th segment and male-genital pores on the 18th segment.
10. Cross-fertilization, but compilation has not been studied in P.posthuma. Development takes place in cocoons.
Source:
1. Practical Zoology Invertebrates by S.S.Lal. 2. A Manual of Practical Zoology Chordates by Dr. P.S. Verma.
