PHYLUMPHYLUM –

ASCHELMINTHESASCHELMINTHES

● Organ system level of organisationOrgan system level of organisation● Bilateral symmetryBilateral symmetry● TriploblasticTriploblastic● Psuedocoelomate Psuedocoelomate

● Free living or parasitic in plants and Free living or parasitic in plants and animals.animals.

● Aquatic or terrestrial.Aquatic or terrestrial.

HABIT AND HABITATHABIT AND HABITAT

● Body of Body of aschelminthes is aschelminthes is circularcircular in cross- in cross-section, hence the section, hence the name name round- wormsround- worms..

● Alimentary canal is complete with a well-developed Alimentary canal is complete with a well-developed muscular pharynxmuscular pharynx..

● An An excretory tubeexcretory tube removes body wastes from the body removes body wastes from the body cavity through the cavity through the excretory pore.excretory pore.

REPRODUCTIONREPRODUCTION

● Dioecious – sexes are Dioecious – sexes are separate separate

● Females longer than Females longer than males.males.

LIFE HISTORYLIFE HISTORY

● Internal fertilisationInternal fertilisation● Direct or indirect Direct or indirect

development.development.

ASCARIS ASCARIS ( (ROUNDROUND WORMWORM))

WUCHERERIAWUCHERERIA (FILARIA WORM)(FILARIA WORM)

ELEPHANTIASISELEPHANTIASIS

ANCYLOSTOMAANCYLOSTOMA ((HOOKWORMHOOKWORM))