COURSE I – FIRST SEMESTERPHYLUM PLATYHELMINTHES

Dorsoventrally flattened, bilaterally symmetrical, triploblastic and acoelomate worms.

Prof. S D Rathod

Flame cell

Excretion is performed by flame cells

Digestive system is incomplete (no anus)

Class – Turbellaria Planarians Free living Sense organs at head

region Eversible pharynx High regeneration

Class – Trematoda

Oral and ventral suckers Endoparasitic example - Fasciola (Liver-fluke)

Class – Cestoda (class of tape worms)

Commonly known as tapeworms since body is long tape like.

These have suckers and hooks for attachment.

Tapeworms are endoparasitic and live in intestine of various vertebrates.

Body is pseudosegmented.

Taenia solium (tapeworm)

Pseudosegmentation

Taeniasis

In fish

In Dog

COURSE I – FIRST SEMESTER

PHYLUM - ASCHELMINTHESCLASS - NEMATODA

Round worms, cylindrical, bilaterally symmetrical, triploblastic, pseudocoelomate.Digestive system complete.

Prof. S D Rathod

Ascaris Ectoderm is

syncytial. Sexes are separate Females are larger

than males and are straight. Males are small and curved at posterior end. They have genital papilla for copulation.

Female lays about 15000 to 20000 eggs daily

More about Ascaris

Pharynx is muscular Sexual dimorphism

Ascariasis

So……. enjoyed???