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An earthworm is a soil-dwelling terrestrial invertebrate that belongs to the phylum Annelida. The term is the common name for the largest members of the class (or subclass , depending on the author) Oligochaeta .
The reddish-gray-colored common earthworm, often called a night crawler in the United States, is familiar to anyone with a fishing rod or a garden.
Earthworms are vital to soil health and to plants growing in it because they transport nutrients and minerals from below to the surface via their waste. An earthworm can eat up to a third of its...
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Jul 5, 2024 · earthworm, any one of more than 1,800 species of terrestrial worms of the class Oligochaeta (phylum Annelida)—in particular, members of the genus Lumbricus. Seventeen native species and 13 introduced species (from Europe) occur in the eastern United States, L. terrestris being the most common.
Earth Worm Characteristics. Earthworms are made up of many small segments known as ‘annuli’. These annuli are ridged and covered in minute hairs that grip the soil allowing the worm to move as it contracts its muscles. At about a third of the worms length is a smooth band known as the clitellum.
Earthworms exhibit a cylindrical, segmented body that varies in color from reddish-brown to pinkish or even light green, depending on the species. An adult earthworm can range in size from a mere 1 inch (2.5 cm) to an astonishing 14 inches (35.6 cm) in some species.
Apr 10, 2018 · TL;DR (Too Long; Didn't Read) Earthworms are soft-bodied, segmented worms, usually pink, brown or red in color and only a few inches long. They burrow deep in the ground during the day and resurface at night to feed.
There are thought to be 4,400 species of earthworm! As the earthworm spends most of its life underground, ploughing through the soil and creating complex burrow networks (that may extend 2m or more beneath the surface), their bodies are basically like a tube of muscle arranged in two layers.
Earthworms are harmless, often beneficial residents of the soil. Earthworms breakdown dead and decaying organic matter into rich humus soil, thereby supporting plant growth. They also dig tiny channels and make holes that aerate soil and improve drainage.
