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Lumbricus contains some of the most commonly seen species of earthworms. Lumbricus has four different species which are Lumbricus rubellus, Lumbricus terrestris, and Lumbricus festivus. There are some major differences between these four species of earthworms.
- Lumbricus rubellus is usually reddish brown or reddish violet, iridescent dorsally, and pale yellow ventrally. They are usually about 25 to 105 mm in length, and have around 95-120 segments.
- Lumbricus castaneus varies from chesnut to violet brown; brown or yellow ventrally, and have orange clitellum. They are usually about 30-70 mm, and have around 82 to 100 segments.
- Lumbricus terrestris has several common names, including "night crawler" (or "nightcrawler") and "dew worm". They are strongly pigmented, brown-red dorsally, and yellowish ventrally. Setae is widely paired both ends of the body. Lumbricus terrestris is the largest earthworm compared to other species. They are about 90 to 300 mm long, and have around 110 to 160 segments.
- Lumbricus festivus are not found in large numbers. They are red-brown, lighter ventrally, iridescent dorsally. Their bodies' lengths vary from 48 to 108 mm, and they have about 100 to 143 segments.
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