Many scientists studied An interaction between parasites and earthworms
and refered to the earthworms may be an
intermediate host or transmitted host or reservoir host for many species of
parasites Noble& Glenn
(1961) recorded Monocystis lumbrici from the seminal vesicle of
the common earthworms In California, Eggs of Ascaridia sp.
are found in earthworms cavity and described by Al– Mayahi, (1994), Holly ,(2008) referred to Toxocara
cati transmitted by small rodents, beetles, earthworms but Toxocara leonina
and T. canis are transmitted by small rodents only and Hadi and Al-Amery (2010)
isolated two species of nematodes Ascaridia sp., Toxcara
sp. from the body cavity of the earthworm.
In the current study were found the nematode parasite Rhabditis sp. infects earthworms while (Wakelin et al,.2001)
recorded two common parasites are
Monocystis (Protozoa, Sporozoa) and Rhabditis (Nematoda); these infect
earthworms. The life history of Rhabditis was briefly documented by Cuénot (1898) and the present research suggest infective
larvae of Rhabditis were able to penetrate earthworm by pores and Poinar and Thomas,( 1975) who suggested the nematodes
entered the host through the nephridiopores. Rhabditis can pear lack of food
and drought so it can be grown indefinitely in laboratory culture but the
association between Rhabditis pellio (Schneider) and earthworms (Poinar and Thomas, 1975) and R.
myriophila and the millipede are similar described Poinar (1986) and revealed that the larval stages of both nematodes enter the
host’s external openings (the excretory system with Rhabditis pellio and
alimentary tract with Rhabditis myriophila) and body cavity. In the
present study nematodes infect many different specimens of field and vermicultured earthworms. but
they are unable to multiply until the host
dead and is invaded by bacteria. Bacteria are
apparently required as a food source. Small numbers of nematodes often occur in
healthy earthworm , but high numbers cause illness or even death. According to Poinar and Thomas(1975) The nematodes can escape
to the outside through the nephridiophores and establish themselves by feeding
on bacteria in the soil. Or they can remain in the host until it dies and then
feed on the decaying carcass and our
results confirm their belief.