PHYLUM -PLATYHELMINTHES

 

PHYLUM -PLATYHELMINTHES

GENERAL CHARACTERS:

1.      These are free living dorsoventrally flattend, triploblastic, coelomate animals.

2.      Some of them are endoparasites. 

3.      Digestive system is incomplete due to absence of anus.

4.      Ingestion through mouth or through general body surface.

5.      Excretory system consists of flame cells.

6.      These are mostly bisexual and fertilization is internal.

 (This phylum consists of  following three classes

Class -Turbellaria, Trematoda and Cestoda)

PLANERIA  DUGESIA

Phylum ;          Platyhelinthis  Body is dorso-ventrally flattened. endoparasite.

Class    ;Turbellari   Free living animal.

Genus  :Dugesia  Head is triangular

Species            :tigrina                         Presence of bands on dorsal surface.

·         CHARACTERS :

1.            It found in freshwater in pond and lake.

2.            Head is triangular with ear like projections..

3.            Mouth is present on ventral side.

4.            Alimentary canal is comparatively well developed.

5.            Anus is absent.

6.            It is hermaphrodite animal.

Ø  LIVERFLUKE (DUGESIA)

Phylum :    Platyhelinthis.        Body is dorso-ventrally flattened. Endoparasite.

Class          ;Trematoda                 Flattened body and cellular epidermis absent.

Genus        :Faciola                        leaf like body.

Species :      hepatica                         found in liver of sheep.  

·         CHARACTERS :

•         Body is dorso-ventrally flattened leaf like.

•         It is dark brown in colour.

•         It is an  endoparasite found in liver of sheep and goats.

•         It bears two suckers. Mouth is surrounded by cephalic sucker and

        ventral sucker present at Posterio-ventral position.

•         Presence of gonopore in between two suckers.

•         Alimentary canal is incomplete.

•         Hermaphrodite animal. 

TAPEWORM

      KINGDOM                            : ANIMALIA Eukaryotic, Multi-cellular, without chloroplast

      SUBKINGDOM                    : EUMETAZOA

      PHYLUM                               : PLATYHELMINTHES

      CLASS                                   : CESTODA

 ·         CHARACTERS

·         Body is ribbon like and divided in to scolex, neck and  proglotids.

·         It is an endoparasite found in man and pig.

·         Scolex bears four suckers.

·         Neck without proglotids.

·         Presence of three types of proglotids- immature, mature and

·           gravid proglotids.

·         Hermaphrodite animal.

·         Alimentary canal is rudimentary. 

PHYLUM : ASCHELMINTHES

 ASCARIS

KINGDOM                      : ANIMALIA  Eukaryotic, Multi-cellular, without

SUBKINGDOM              : EUMETAZOA

PHYLUM                         : ASCHELMINTHES

CLASS                             : NEMATODA 

GENUS                            : Ascaris 

Species                             : lumbricoides

CHARACTERS :

1. ·         Commonly called as round worm.
2. ·         Body is elongated narrow and round.
3. ·         Body is unsegmented..
4. ·         Distinct sexual dimorphism.
5. ·         Male is smaller with bent posterior end.
6. ·         Female is larger and  straight.
7. ·         Endoparasite , found in intestine of man.