Earthworm External Anatomy

Study the illustration of an earthworm shown on the left. Step 1 of 7th grade dissection.

Earthworm Anatomy

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That is they do not have a backbone.

Earthworm external anatomy. Examine your earthworm and determine the dorsal and ventral sides. The external body of an earthworm is well adapted for living in the soil similar to the external structure of other insects. In this article we will discuss about the external and internal anatomy of earthworm.

External anatomy of earthworm. Locate the clitellum which is on the anterior end of the worm. What is the external anatomy of an earthworm.

Earthworm is the common name for the largest members of oligochaeta which is a class or subclass depending on the author. Locate the mouth of the worm on the far anterior end of the wormthe openings toward the anterior of the worm are the sperm ducts. The very first section of the anterior contains the mouth and prostomium.

External earthworm anatomy. This will also help you to draw the structure and diagram of earthworm. Insects sea stars spiders jellyfish and millipedes are other examples of invertebrate animals.

The body of pheretima is nearly circular in cross section and varies from 7 to 8 inches 18 19 cms in length. The general colour. Earthworm anatomy external features.

Each carries male and female sex organs. The openings near the clitellum are the genital setae. As invertebrates they lack a true skeleton but maintain their structure with fluid filled coelom chambers that function as a hydrostatic skeleton.

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The front or head of the worm is called the anterior. Please try again later.

External View Of Common Earthworm