A Survey on the resources of Dilong showed that 13 species and varieties involving 3 genera of Magascoleidae and Lumbricidae were commonly used under the general name "Dilong"as Chinese traditional and folk medicine. About 90% commercial "Dilong"was derived from the adult form of Pheretima aspergillum(E.Perrier ) ; P. pectinifera (Michaelsen) ; P. vulgaris (Chen)and P. gudemi (Michaelsen)accepted by Chinese pharmacopoeia. Nine unauthorized species (including one variety)such as Allolobophora caliginoa trapezoides (Ant. Duges ) ; P. huperessis (Michaelsen ) ; P. praepinguis (Gates ). etc. were circulated on limited market places.

国家科委“八五”重点攻关课题