ANNELIDA: Case study Pheretima posthuma

Class: B.SC III SEM 6

Subject: Zoology

Topic: ANNELIDA: Case study Pheretima posthuma

Time: (60 min) (3 classes)

Mention the learning outcome

1.Student will understand the important characters of the Phylum Annelida

2.Student can differentiate betwrrn different organs of the organism

3.Student can predict and diagnose how to isolate and identify two different bacterial strains found in the drilosphere of Pheretima

Mention your step-wise actions and provide clear instructions.

1.Classroom lecture 2. Videos and ppt’s 3. Dry Lab Work (Simulations)

(Representative image: optional)

Let's understand the task!

You could modify/add on to this image to convey your task and outcomes in the best possible way

Representative image (optional)

Shown here is a picture of a dissected preserved specimen.
This organism is an invertebrate, has metameric segmentation all over it’s body.
Plays a significant role in aerobic disintegration of organ materials. It is hermaphroditic in nature.

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Pheretima posthuma is the most common earthworm species which is used as a prototype for teaching and learning currently. The video showing THE DISSECTION gives an overview about the organ system level of organisation. The different functional systems can be co-related from the video under observe section.

Earthworms work in close association with different bacterial colonies for successful metabolism. This is mostly a symbiotic association. Microorganism also aid towards conversion of vermicasts in vermicompost. so, during study of earthworms under natural conditions, isolations can be carried out to identify the various strains of microorganisms present in the environment.

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