Class: Trematoda (Flukes)
All trematodes or flukes are
either endo or ecto-parasitic. Ectoparasitic trematodes develop directly in or
on a single type of host and are said to be monogenetic, endo-parasitic
trematodes are known as digenetic.
Most trematodes are pale cream
in color, but some may be slightly reddish due to engorgement of blood. Most
trematodes are less than 30 mm in length; but some biggest species like Fasciola gigantica, 75 mm long and
smaller like Heterophyes heterophes
2mm long may also be found. The body is usually covered by a smooth tegument
(cuticle), but some times the cuticle may be spiny or scaly. The mouth is
situated forward and at the tip of the body, the digestive systems is well
developed and the intestine is bifurcated. Trematodes cling to the body of host or remain attached to organs by means of
organs of adhesion known as suckers. Suckers may sometimes be armed with hooks
or spines. excretory pore is single in most case opening posteriorly and paired
spending anterodorsally.
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