Phylum Platyhelminthes

Question 1

Characteristics of class turbellaria

Answer 1

Bilateral symmetry, triploblastic, acoelomate, terrestrial/freshwater/ marine, mostly free living/some predatory or scavenger, some in association with other animals, epidermis is ciliated on ventral surface only (locomotion).

Question 2

Systems un dugesia sp.

Answer 2

Digestive system: branching intestine, no anus, insert pharyx into prey and release digestive enzymes, suck up soup of digested tissues.
Nervous system: transverse nerves, “eyes” with shadow response and respond to touch and light.
Excretory: brached system throughout body.
Reproduction: hermaphrodites , pair up and fertilise each other eggs

Question 3

Characteristics of class Trematoda

Answer 3

Always parasitic, non-segmented body, simple digestive system, most hermaphrodites

Question 4

Example: Clonorchis sp.

Answer 4

Infects the liver, gallbladder and bile duct.
3 hosts (human, snail and fish)
Eggs pass out un faces.
Attaches to human host by oral and ventral sucker.
Symptoms of infection abdominal pain, nausea and diarrhea.

Question 5

Example: Schistosoma

Answer 5

Live in blood vessels near intestine or urinary bladder.
Considerable damage to blood vessels
Mollusc & vertebrate host

Question 6

Characteristics of Cercomeromorpha

Answer 6

All parasitic and hermaphrodites
Attache to organs with suckers and hooks, very thin, protective cuticle, body made by various segments, mature proglottids fill with eggs, detaches and carried out by host via feces , e.g. Tapeworms

Question 7

Characteristics of platyhelminthes

Answer 7

Triploblastic, bilateral symmetry, unsegmented worms, body dorsoventrally flattened, acoelomate , free living or parasitic, cephalisation , organ system( digestive, reproductive, nervous &excretory), no circulatory system, no respiratory system.