Lumbricus contains some of the most commonly seen species of earthworms. Lumbricus has four different species which are Lumbricus rubells, 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, irridescent dorsally, and pale yellow ventrally. They are usually about 25 to 105 mm in length, and have around 95-120 segments.
Lumbricus castaneus's colors vary 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 different names like Night Crawler or Dew Worms. They are strongly pigmented, brown-red dorsally, and yellowish ventrally. Setae is widely paired both ends of the body. Lumbricus terrestris is the largest earthworms compared to other species. They are about 90 to 300 mm long, and have aroudn 110 to 160 segments.
Lumbricus festivus is not found in large numbers. They are red-brown, lighter ventrally, irridescent dorsally. Their bodies' lengths vary from 48 to 108 mm, and they have about 100 to 143 segments.
Lumbricus rubellus, however, is referred to by some sources, as Driftworms, Garden Worms, Angle Worms, Leaf Worms, Red March Worms or Red Wrigglers.
The fact that Lumbricus rubellus “may be kept in the fridge or in cups at room temperature for several weeks.” is also to their credit.
Eisenia fetida are less popular as fish bait than Lumbricus rubellus due to their more slender girth and shorter length of 1.5-2.5 inches, but they are “ideal for trout and panfish.