Printable worm diagrams to show you the anatomy of an earthworm, along with the illustration provided in the diagrams. We also provide a worm gear diagram, along with the earthworm anatomy, right in the list of images below. Browse the diagrams in the list and click to save one!
You can observe in the worm diagram above that the body of an earthworm is nearly circular in cross-section and varies from 7 to 8 inches (18-19 cms) in length. The animal is elongated and divided into a series of ring-like segments or metameres or somites, which are separated from one another by narrow transverse grooves. Usually there are 120 true somites. A fleshy lobe, the prostcmium, projects over the mouth in front of the first segment. Study the following anatomy of the worm below!
Every segment of the body, excepting the clitellar, and the first and last, bears numerous chitinous bristles called setae; these are implanted on the body wall and are arranged in the form of rings. The setae serve as hold-fasts when the worm is moving over the ground or resting in its burrow. The entire body is covered by a thin transparent cuticle which is secreted by the epidermis. The cuticle is porous and protects the body from injury.
Meanwhile, the following diagram is the worm gear diagram. A worm drive is a gear arrangement in which a worm meshes with a worm gear. The two elements are also called the worm screw and worm wheel. You can use the diagrams above to help you study about the worm anatomy and the worm gear components!