Digenetic Trematodes Overview

Questions and Answers

What type of flukes are classified as hepatic or liver flukes?

Intestinal flukes

Hepatic flukes (correct)

Lung flukes

Blood flukes

Which of the following best describes digenetic trematodes?

They can exist in multiple host species. (correct)

They are exclusively blood parasites.

They can only infect humans.

They have a single host in their life cycle.

In the context of digenetic trematodes, what does 'digenetic' refer to?

Utilizing two or more host organisms for survival (correct)

Reproducing in a single organism

Involving two different environments

Having two stages of development

Which of the following organisms is a common host for hepatic flukes?

Sheep Signup and view all the answers

What is a primary characteristic of blood flukes in relation to their life cycle?

They require a mollusk as an intermediate host. Signup and view all the answers

Which of the following accurately describes the respiratory system of intermediate hosts in this context?

It is absent. Signup and view all the answers

What characteristic distinguishes male trematodes from females?

Males are smaller than females. Signup and view all the answers

Which of the following is true regarding the nervous system of these pseudocoelomate worms?

It consists of a nerve ring and several nerve cords. Signup and view all the answers

Which statement regarding the excretory system of these worms is correct?

It may feature both glandular organs and canals. Signup and view all the answers

How is fertilization achieved in these trematode species?

Via internal fertilization. Signup and view all the answers

What is a significant characteristic of the developmental stage of these worms?

Direct development without larval stages occurs. Signup and view all the answers

What characterizes the body structure of digenetic trematodes?

Flattened and unsegmented Signup and view all the answers

Which of the following is a common characteristic of digenetic trematodes?

Attach to their hosts by suckers Signup and view all the answers

What is a defining trait of the alimentary canal in digenetic trematodes?

It consists only of a mouth with no anus Signup and view all the answers

In which host type are the adult digenetic trematodes typically found?

Different tissues of a primary vertebrate host Signup and view all the answers

What type of nervous system do digenetic trematodes possess?

Simple and decentralized Signup and view all the answers

Study Notes

Digenetic Trematodes Classification

Classified based on location in the host body:

Hepatic or Liver Flukes

Example: Located in the intermediate host's mesenteric vein and the venous plexus of the bladder in the final host.

General Characteristics of Digenetic Trematodes

Belong to Kingdom Animalia and Subkingdom Metazoa.
Structurally classified under Branch Eumetazoa, Division Bilateria, and Section Pseudocoelomata.
Body features:
- Bilaterally symmetrical and unsegmented.
- Triploblastic with slender cylindrical bodies.
Alimentary canal:
- Straight and complete with mouth and anus or cloacal opening.
Lack of respiratory and circulatory systems.
Presence of cuticle; absence of cilia on the body.
Body wall constructed only with longitudinal muscles.
Excretory system composed of glandular organs or canal systems.
Dioecious reproduction; males are typically smaller than females.
Internal fertilization.
Nervous system architecture:
- Comprised of a nerve ring around the esophagus with 6 short anterior and 6 long posterior nerve cords.
Eggs characterized by a chitinous shelled covering.
Development typically direct; no asexual reproduction or regeneration noted.
Examples include Fasciola and Schistosoma.

Class Cestoda (Tape Worms)

Class identified as endoparasitic and segmented.
Example species include Taenia.

Class Digenea

Characteristics:
- All species are endoparasitic.
- Body structure is flattened and unsegmented.
- Attachment to hosts via suckers.
- Alimentary canal features a mouth but lacks an anus.
- Possesses complex muscle layers.
- Presence of excretory organs and a nervous system.
Adult worms inhabit various tissues in the primary vertebrate host.

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Description

This quiz explores the classification of digenetic trematodes based on their location in the body of the host, specifically focusing on hepatic or liver flukes. Test your knowledge on various types and characteristics of these parasitic flatworms.