Trematode Overview

Question 1

What is the general morphology of the Trematode?

Answer 1

Unsegmented flattened size and shape variations

Question 2

What are two shape variations of Trematodes?

Answer 2

Leaf- like and Worm-like

Question 3

What are the two types of Trematodes?

Answer 3

Monogenetic and Digenetic

Question 4

Define Monogentic

Answer 4

Single host for entire lifecycle (fish amphibians and reptiles)

Question 5

Define Digenetic

Answer 5

Two to four Obligate hosts, potential Paratenic hosts (animals and humans)

Question 6

What is a Paratenic host?

Answer 6

Transport the parasite from the Intermediate host to the Definitive host by ingestion

Question 7

Trematodes are Hermaphroditic except for which type?

Answer 7

Blood flukes (Schistosomes)

Question 8

Parts of the Trematode GI tract

Answer 8

Oral sucker, Pharynx, Esophagus, and Blind Seca

Question 9

How does the Trematode expel waste

Answer 9

Regurgitation bc it has no anus

Question 10

How does the Trematode attach to the host?

Answer 10

Ventral sucker called the Acetabulum

Question 11

In the Cercariae stage of the Digenetic lifecycle what are the three options of entering the Definitive host?

Answer 11

1. Skin penetration
2. Encyst on vegetation and wait to be eaten
3. Penetrate a second intermediate host that will be eaten by the Definitive host

Question 12

During the Digenetic lifecycle, what organism emerges from the egg

Answer 12

Miracidia

Question 13

What is the Indirect lifecycle?

Answer 13

development within the intermediate host

Question 14

What is the most common egg type of the Trematode

Answer 14

Operculated (trap door)

Question 15

What are the Predilection sites of Trematodes within the Definitive host

Answer 15

Rumen/ reticulum, intestines, Liver, Bile Duct, Lungs, and Blood Vessels