Eudrilus eugeniae

Eudrilus eugeniae, also called the "African Nightcrawler", is an earthworm species native to tropical west Africa and now widespread in warm regions under vermicompost; it is an excellent source of protein and has great pharmaceutical potential.
Growth.
The growth of individual earthworms increases as the population density lowers, but the greatest overall earthworm biomass production occurs at the highest population density.
The greatest number of cocoons per week and the number of hatchlings per cocoon are obtained at 25 °C. Cocoons of "E. eugeniae" hatched in only 12 days at 25 °C, and the worms reach sexual maturity in as little as 35 days after hatching.
Etymology.
Named after Johan Gustaf Hjalmar Kinberg's Swedish survey ship, the
‘Eugenie’.
Life cycle.
Throughout its life cycle, "E. eugeniae" grows much more rapidly than "Eisenia fetida", in similar environmental conditions.
The African Nightcrawler grows well at a temperature of 24-30 °C (75-86 °F). Maximum weight of around 2.5 grams occurs within 8–10 weeks.
The African Nightcrawler has a uniform purple-grey sheen and the posterior segments are evenly tapered to a point. The segments of the Brandling worm ("Eisenia fetida") alternate reddish-orange and brown; the posterior segments do not taper, and the final segment is blunt.