Zoology Lab 5 - Platyhelminthes

Flatworms: some free-living and some parasitic, parasitic have external body covering (tegument or neodermis), bilateral symmetry, acoelomate, monoecious

Dugesia sp. (Planaria) w.m.

Dugesia sp. (planaria) x.s.

Dugesia sp. (planaria)

Kingdom: Animalia

Phylum: Platyhelminthes

Class: Turbellaria

bilateral symmetry (distinct head)

ciliated epidermis

monecious (reproduction)

free living

Clonorchis sinensis

Clonorchis sinensis

Kingdom: Animalia

Phylum: Platyhelminthes

Class: Trematoda

parasitic

covered with nonciliated syncytial tegument, body underneath called parenchyma

monecious (reproduction)

oral and ventral suckers (no hook)

Fasciola hepatica (liver fluke)

Fasciola hepatica

Kingdom: Animalia

Phylum: Platyhelminthes

Class: Trematoda

oral and ventral suckers

parasitic

monecious

syncytial tegument

Dipylidium caninum

Dipylidium caninum

Kingdom: Animalia

Phylum: Platyhelminthes

Class: Cestoda

endoparasitic

scolex equipped with suckers or hooks

tegument

body divided into series of proglottids that are monecious

fleas as intermediate host

Taenia pisiformis

Taenia pisiformis

Kingdom: Animalia

Phylum: Platyhelminthes

Class: Cestoda

endoparasitic

scolex equipped with suckers or hooks

tegument

body divided into series of proglottids

larvae found in liver of rabbits

sporocysts

first stage of larvae fasciola hepatica

no mouth or digestive system

gets nutrients directly from host

rediae

second stage of larvae fasciola hepatica

elongated sac with mouth and simple digestive system

can feed on hosts tissue

cercariae

final stage of larvae fasciola hepatica

seeks for host to infect

various flatworms

various flatworms