Source of content: general zoology lab guide.

Operation method

Ascaris lumbricoides and annelid worms section observation test

Principle

1. to understand the general characteristics of nematode animals by observing the morphological structure of human roundworms as an example. 2. to understand the main characteristics of oligochaetous annelids by observing the external morphology and internal structure of annelid earthworms. 3. to understand the main characteristics of nematode animals by observing the external morphology and internal structure of oligochaetes.

Materials and Instruments

Ascaris lumbricoides dip specimen Ascaris lumbricoides transverse section Ascaris lumbricoides egg mounts Earthworm transverse section Circumcised earthworm dip specimen
Microscope Slides Coverslips

Move

1. observe immersed specimens of human roundworms, distinguishing between their anterior and posterior ends, dissecting them to observe their internal structure, and observing transverse section slide specimens of roundworms.
2. observe life history mounted specimens of duodenal hookworms, whipworms and pinworms.
3. observe immersed specimens of annelid worms and sandworms to understand their external features; observe their transverse section slide specimens to further understand their internal structural features.

Common Problems

I. Homework:

Draw a cross sectional structural diagram of Ascaris lumbricoides and Cyclostomes and name them.

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