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Chapter: Biology Practicals: Collecting Biology Specimens

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Phylum Annelida: Earthworms (Chambo) and Leeches (Ruba) - Collecting Biology Specimens

Earthworms (Chambo) and Leeches (Ruba): Phylum Annelida are eukaryotic organisms. Earthworms have a mouth at their anterior end and anus at the posterior end with a bulge called a clitellum in the middle that holds eggs.

Phylum Annelida

Earthworms (Chambo) and Leeches (Ruba)

Phylum Annelida are eukaryotic organisms. Earthworms have a mouth at their anterior end and anus at the posterior end with a bulge called a clitellum in the middle that holds eggs. The earthworm uses bristles (small hair like structures) to burrow through the dirt.

 

The following are the features of the Phylum Annelida:

1.           They are segmented. They have separate internal organs and body walls.

2.           They have a thin, moist, non-chitinous cuticle.

3.           Their body has external bristles.

Collection

Earthworms can be found after a rain by digging under rocks or in other damp places. Leeches can be found in a river.

Preservation

You can keep earthworms in a container with fresh soil to preserve live spec-imens. If killed, these organisms can be preserved in ethanol alcohol for a few months.

Killing

Place the Annelida into a closed bottle in which is suspended a ball of cloth or mosquito net soaked in methylated spirits. Avoid direct contact with the spirit

Dissection

You can observe the internal structures of an earthworm by making a lateral cut along the body.

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