The Chaetogaster limneaei is a small freshwater
worm that has a transparent body, and lives as a
commensal in the house of watersnails like the Greater pond snail.
Here it is protected against predators, and is
also transported by the snail. Probably the snail is
protected against parasites by the Chaetogaster limnaei.
The worm plays an role in ricefields in Africa, were the
snails gives shelter to the worm in the dry season and the
worm protects against trematode infections.
reproduction of chaetogaster
At the end of the summer the worm leaves the snailhouse.
It feeds on algae and rotifers as a free living worm.
Chaetogastor reproduce by forming buds, and then divides
in two worms, a larger and a smaller. But it can also
Living together for the benefit of both is called
commensale ectosymbiose. Chaetogaster protects against
other worms and the snail protects against predators
and environmental threats. The greater pond snail
(Lymnaea stagnalis) transports chaetogaster limnaei
to other ponds, as it is capable to live outside the
water for shorter periods.
The family of the Naididae or Tubificidae are
clitellate oligochaete worms living in fresh water
All clitellate worms are hermafrodetic. They live
a hidden live mostly as bottom dwellers.
Some members are well known like the
tubificids, with a live in the mud.
Some live on waterplants. Reproduction is
mostly done asexualy by paratomy, that
starts by the forming of budds and end
by the splitting of the body
in two worms, a large and a small one.
On this website you can find ; sludge worm or Tubifex tubifex. chaetogaster limnaei
This Chaetogaster limnaei has just swallowed a cyclops:
on top is the mouth or snouth. The cyclops can
be seen directly under the head.
Small segmented worms that live in the mud of freshwater ditches,
and feed on small organism that are swallowed as a whole.
The Chaetogaster belong to the segmented worms.