Although mature earthworms are easily distinguished from the immature ones by the presence of a clitellum
, which differs between the two species in its specific position on body segments, immature individuals can be indistinguishable (Hale, 2013).
The anterior of the body has peristomium, fewer segments are made a thick band called as clitellum
and remaining of body after clitellum
is called as abdomen.
yellow-orange in 13-16, 17 only dorsally, saddle-shaped without reaching ventral setae and covering setae cd (Fig.
Known as regeneration, the front part must be long enough to contain the clitellum
(the thicker, sort of girdle part) and at least 10 segments behind the clitellum
, which normally makes up about half the length of the worm.
foetida were collected and then divided into three groups namely hatchlings' juveniles' and adults' based on their body lengths and weights (wet basis) and stages of clitellum
Like the oligochaeta, they share the presence of a clitellum
. Like earthworms, leeches are hermaphrodites.
1) and described as 'more fully mature than the other', abscised behind the clitellum
, with a total segment number reaching ca 86, presently designated as a lectotype of Tritogenia zuluensis (Beddard, 1907) (NHMU Oslo C5726, Figs 2, 3).
At the end of the aestivation period, mature individuals prepare for reproduction and the glands associated with the clitellum
increase in volume and are projected laterally.
torquata, this species is larger and lacks a characteristic white clitellum
. This species inhabits the northern oligotrophic part of the Chivyrkuy Gulf (Figure 1: transect 3).
in XII-XIII, thick, with dense gland cells located either irregularly or in obscure transversal rows; lacking between the male pores.
The experts say that the front half of an earthworm can regenerate its back half if the front part is long enough to contain the clitellum
(the swollen band about one-third of the way from the worm's head) and includes at least 10 segments behind it.