Earthworm Characteristics

By Amber Kelsey
boy holding earthworm

Earthworms (Lumbricus terrestris) are soft-bodied, segmented worms that belong to the Annelida phylum. Earthworms are also called nightcrawlers because they burrow down in the ground during the day and come above ground at night to feed.



Bodies

earthworms

Earthworms are invertebrates, meaning they don't have backbones. Most earthworms appear pink, brown or red in color.

Size

earthworm

While most earthworm species grow to be only a few inches long, some earthworms grow to a snake-like 22 feet. The longest earthworms live in Australia and South Africa.

Anatomy

earthworm on soil

An earthworm has a small brain, a digestive system, a reproductive system and a circulatory system with five pairs of hearts. Earthworms breathe through their skin instead of with lungs.

Reproduction

two earthworms mating

Earthworms are hermaphrodites, meaning they possess both female and male reproductive systems. Mating earthworms lie together and pass sperm to one other.

Habitat

earthworm going into dirt

Earthworms are terrestrial worms that like to live in moist soil and leaf litter. Earthworms don't live in regions with permafrost, deserts or permanent ice and snow.

Fun Facts

pile of earthworms

There are about 2,700 earthworm species in the world.